Mycology Dimorphic Fungi
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Primary infection in most cases of dimorphic fungi is _________.
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Cardiac infection
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Gastro infection
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Pulmonary infection
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Explore the characteristics of dimorphic fungi with this focused quiz. Learn about their yeast forms, temperature preferences, and modes of infection. This quiz assesses understanding of fungal pathogenesis and environmental interactions, crucial for students and professionals in biology and health sciences.
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- 2.
Primary infection of dimorphic fungi is contracted through inhalation of what?
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Conidia
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Oocytes
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Larvae
Correct Answer
A. ConidiaExplanation
Dimorphic fungi are fungi that can exist in two different forms depending on the environmental conditions. The primary infection of dimorphic fungi is typically contracted through inhalation of conidia. Conidia are asexual spores produced by fungi that are specifically adapted for dispersal through the air. When inhaled, these conidia can enter the respiratory system and cause an infection. Oocytes and larvae, on the other hand, are not associated with the primary infection of dimorphic fungi.Rate this question:
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- 3.
With dimorphic pathogens the Yeast forms are found in tissue and in culture at ______ degrees celsius.
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25-30
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37
Correct Answer
A. 37Explanation
Dimorphic pathogens are pathogens that can exist in two different forms, typically as yeast (unicellular) or mold (multicellular). The question asks about the temperature at which the yeast forms of these pathogens are found in tissue and in culture. The correct answer is 37 degrees celsius. This is because most dimorphic pathogens, such as Candida and Histoplasma, grow as yeast at the human body temperature of 37 degrees celsius. This temperature is optimal for their growth and survival in the host.Rate this question:
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- 4.
Dimorphic pathogens are pathogens of the ____.
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Heart
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Lungs
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Intestine
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Skin
Correct Answer
A. LungsExplanation
Dimorphic pathogens are pathogens that have the ability to exist in two different forms, typically as a mold or a yeast. These pathogens are known to cause infections in the lungs, such as histoplasmosis and coccidioidomycosis. Therefore, the correct answer is lungs.Rate this question:
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- 5.
Dimorphic pathogens are typically transported by what route?
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Blood
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Food
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Air
Correct Answer
A. AirExplanation
Dimorphic pathogens are typically transported by the air route. This means that these pathogens can be transmitted through respiratory droplets that are released into the air when an infected individual coughs, sneezes, or talks. These droplets can then be inhaled by others, leading to the spread of the pathogen. This mode of transmission is common for pathogens such as tuberculosis and fungal infections, which can exist in two different forms (dimorphic) depending on the environmental conditions.Rate this question:
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- 6.
Sporothrix schenckii most commonly associated with gardening working the soil; nicknamed "_________".
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Tulip farmer's disease
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Rose farmer's disease
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Rose gardener's disease
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Sunflower farmer's disease.
Correct Answer
A. Rose gardener's diseaseExplanation
Sporothrix schenckii is a fungus that is commonly associated with gardening and working the soil. It is known to cause a specific type of infection called sporotrichosis. This infection is often referred to as "rose gardener's disease" because it is frequently contracted by individuals who work with roses in their gardens. The fungus can enter the body through small cuts or punctures in the skin, and can cause skin lesions and other symptoms. Therefore, the correct answer for this question is "rose gardener's disease".Rate this question:
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- 7.
At 25-30 degrees celsius, the colony develops as the ______ form.
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Yeast
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Mold
Correct Answer
A. MoldExplanation
At temperatures between 25-30 degrees Celsius, the colony develops as the mold form. This suggests that mold is the preferred form of growth for the organism in this temperature range.Rate this question:
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- 8.
Histoplasma capsulatum is most often associated in soil with a _______ nitrogen content resulting from deposits of excreta of starlings, chickens and bats.
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Low
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High
Correct Answer
A. HighExplanation
Histoplasma capsulatum is a fungus that is commonly found in soil. It is known to thrive in soil with a high nitrogen content, which is often the result of deposits of excreta from starlings, chickens, and bats. This is because these animals have a high protein diet, which leads to higher nitrogen levels in their waste. Therefore, the correct answer is "High."Rate this question:
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- 9.
The Blastomyces dermatitis fungus does not survive well in clinical specimens so they should be plated as soon as possible.
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True
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False
Correct Answer
A. TrueExplanation
The Blastomyces dermatitis fungus is known to have poor survival rates in clinical specimens. Therefore, it is crucial to plate these specimens as soon as possible to increase the chances of successful growth and identification of the fungus. This is why the statement "The Blastomyces dermatitis fungus does not survive well in clinical specimens so they should be plated as soon as possible" is true.Rate this question:
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- 10.
This organism forms "rosette-like" cluster in young cultures; conidia also form singly along the hyphae.At 35-37 degrees, round, oval and fusiform budding cells of various sizes often called, "cigar bodies" are seen.
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Sporothrix schenckii
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Histoplasma capsulatum
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Blastomyces dermatitidis
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Paracoccidioides brasiliensis
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Penicillium marneffei
Correct Answer
A. Sporothrix schenckiiExplanation
Sporothrix schenckii is the correct answer because it forms "rosette-like" clusters in young cultures and its conidia also form singly along the hyphae. Additionally, at 35-37 degrees, round, oval, and fusiform budding cells of various sizes, often called "cigar bodies," are seen. This description matches the given information about the organism.Rate this question:
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- 11.
Exoantigen testing is _______ than conventional methods of identification, works on nonviable cultures as well.
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Slower
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Faster
Correct Answer
A. FasterExplanation
Exoantigen testing is faster than conventional methods of identification because it does not require the growth of viable cultures. Conventional methods often involve culturing the organism, which can take time for the bacteria or virus to grow and produce visible results. In contrast, exoantigen testing directly detects the presence of antigens released by the organism, allowing for a quicker and more efficient identification process.Rate this question:
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- 12.
Brain heart infusion agar with blood is used for the conversion to the _____ phase.
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Yeast
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Mold
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Larva
Correct Answer
A. YeastExplanation
Brain heart infusion agar with blood is a nutrient-rich medium that provides optimal conditions for the growth and proliferation of microorganisms. Yeast is a type of fungus that typically grows and reproduces in an asexual manner, making it suitable for cultivation on this agar. The addition of blood to the agar provides additional nutrients and factors that support the growth of yeast. Therefore, brain heart infusion agar with blood is commonly used for the conversion to the yeast phase.Rate this question:
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- 13.
Is the yeast phase of Blastomyces dermatitidis inhibited by cycloheximide?
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Yes
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No
Correct Answer
A. YesExplanation
Cycloheximide is an antifungal agent that inhibits protein synthesis in eukaryotic cells. Blastomyces dermatitidis is a dimorphic fungus that exists in two phases: the yeast phase and the mold phase. The yeast phase is the pathogenic phase of the fungus, while the mold phase is the saprophytic phase. Cycloheximide specifically targets the yeast phase of Blastomyces dermatitidis and inhibits its growth. Therefore, the yeast phase of Blastomyces dermatitidis is indeed inhibited by cycloheximide.Rate this question:
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- 14.
Microscopically, at 25-30 degrees celsius, ______ produces deleicate, thin septate and branching hyphae that are hyaline. Slender, tapering conidiophores arise at right angles to the hyphae that bear many small tear-shaped or almost round conidia on delicate threadlike denticles forming a "rosette-like" cluster in young cultures; conidia also form singly along the hyphaeAt 35- 37 degrees celsius, round, oval and fusiform budding cells of various sizes often called "cigar bodies" are seen.What dimorphic fungi am I describing?
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Sporothrix schenckii
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Histoplasma capsulatum
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Blastomyces dermatitidis
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Paracoccidioides brasiliensis
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Penicillium marneffei
Correct Answer
A. Sporothrix schenckiiExplanation
At 25-30 degrees Celsius, Sporothrix schenckii produces delicate, thin septate and branching hyphae that are hyaline. Slender, tapering conidiophores arise at right angles to the hyphae that bear many small tear-shaped or almost round conidia on delicate threadlike denticles forming a "rosette-like" cluster in young cultures; conidia also form singly along the hyphae. At 35-37 degrees Celsius, round, oval, and fusiform budding cells of various sizes often called "cigar bodies" are seen.Rate this question:
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- 15.
Evidence suggests that each Dimorphic Fungi is a saprophyte in soil. But are they part of the normal flora in man?
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Yes
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No
Correct Answer
A. NoExplanation
Dimorphic fungi are capable of existing in two different forms, typically as a mold in the environment and as a yeast in the human body. While they are commonly found in soil as saprophytes, they are not considered part of the normal flora in humans. Normal flora refers to the microorganisms that naturally reside in or on the human body without causing harm. Dimorphic fungi can cause infections in humans, such as histoplasmosis or coccidioidomycosis, but they are not typically present as part of the normal microbiota. Therefore, the correct answer is "No."Rate this question:
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- 16.
Infection in general with dimorphic fungi are typically what with immunocompetent patients?
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Asymptomatic
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Symptomatic
Correct Answer
A. AsymptomaticExplanation
Infection with dimorphic fungi is typically asymptomatic in immunocompetent patients. This means that individuals with a healthy immune system may not experience any noticeable symptoms or signs of the infection. It is important to note that this answer assumes the question is asking about the general scenario and does not account for specific cases or exceptions.Rate this question:
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- 17.
Conversion from the Histoplasma capsulatum mycelial form to the yeast form does not always occur in vitro
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True
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False
Correct Answer
A. TrueExplanation
Therefore, identification is usually done by a reference lab; this is done by nucleic acid probe or by exoantigen test.Rate this question:
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- 18.
This fungus's conidia can develop either at the apex of the conidophore giving a ________-like appearance or directly along the hyphae.
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Cone
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Box
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Lollipop
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Vase
Correct Answer
A. LollipopExplanation
The given question describes a fungus that can develop its conidia either at the apex of the conidophore, giving a cone-like appearance, or directly along the hyphae. Among the options provided, "lollipop" is the best fit as it represents a conical shape on a stick, resembling the cone-like appearance of the fungus's conidia.Rate this question:
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- 19.
Are skin tests useful for immunocompetent individuals when dealing with dimorphi fungi?
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Yes
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No
Correct Answer
A. YesExplanation
Skin tests are useful for immunocompetent individuals when dealing with dimorphic fungi because these tests can help identify if a person has been exposed to the fungi and if they have developed an immune response. This can be helpful in diagnosing and managing fungal infections caused by dimorphic fungi. Skin tests involve injecting a small amount of the fungal antigen into the skin and observing for a localized reaction, which can indicate an immune response. Therefore, skin tests are a valuable tool in the diagnosis and management of fungal infections in immunocompetent individuals.Rate this question:
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- 20.
The pulmonary infection with Histoplasma capsulatum is sometimes called ____________
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Rose gardener's disease
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Darling's disease
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Gilchrist's disease
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Chronic granulomatous disease
Correct Answer
A. Darling's diseaseExplanation
The correct answer is Darling's disease. Darling's disease refers to the pulmonary infection caused by Histoplasma capsulatum. It is named after Dr. Edwin R. Darling, who first described the disease in 1906. The fungus is found in soil contaminated with bird or bat droppings and can be inhaled, leading to respiratory symptoms. The infection primarily affects the lungs but can also spread to other organs.Rate this question:
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- 21.
Histoplasma capsulatum var. duboisii is found primarily in Africa; it is identical to H. capsulatum var. capsulatum except that it develops ___________ yeast cells.
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Larger, thick-walled
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Smaller, thin-walled
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Larger, thin-walled
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Smaller, thick walled
Correct Answer
A. Larger, thick-walledExplanation
Histoplasma capsulatum var. duboisii is found primarily in Africa and is identical to H. capsulatum var. capsulatum except that it develops larger, thick-walled yeast cells. This means that when compared to H. capsulatum var. capsulatum, H. capsulatum var. duboisii has yeast cells that are bigger in size and have thicker cell walls. This characteristic difference helps in distinguishing between the two varieties of Histoplasma capsulatum.Rate this question:
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- 22.
Histoplasmosis has been nicknamed caver's or ________'s disease, because of its occurrence in those who explore caves, which are often inhabited by bats.
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Rose gardener's
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Gilchrist's
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Spelunker
Correct Answer
A. SpelunkerExplanation
Histoplasmosis is a fungal infection that is commonly found in caves, particularly those inhabited by bats. It has been nicknamed "caver's disease" or "spelunker's disease" because it is frequently contracted by individuals who explore caves, known as spelunkers. The term "spelunker" refers to someone who explores caves as a hobby or profession. Therefore, the correct answer is "spelunker" as it accurately describes the individuals who are at risk of contracting histoplasmosis due to their cave exploration activities.Rate this question:
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- 23.
Sporothrix schenckii grows rapidly becoming mature within ____ days.
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5
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10
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21
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28
Correct Answer
A. 5Explanation
Sporothrix schenckii is a fungus that grows rapidly and becomes mature within 5 days.Rate this question:
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- 24.
Choose the Geographical description that matches the fungi.Penicillium marneffei
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Central and South America, Mexico, eastern Europe and in the north-central US
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Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers
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Endemic in North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries
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Is endemic in northwestern, central and southwestern South America, Central America and southern Mexico
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Areas of Southeast Asia
Correct Answer
A. Areas of Southeast AsiaExplanation
Penicillium marneffei is a type of fungi that is endemic in areas of Southeast Asia. This means that it is commonly found and restricted to this specific region.Rate this question:
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- 25.
At 25-30 degrees celsius on SDA, it is at first yeastlike, then prickly and finally very cottony with white aerial mycelium, mycelium turns tan or brown with age with the reverse being tan.At 35-37 degrees celsius, colonies are cream to tan in color, heaped or wrinkled and waxy; sen best on BHI.Microscopically, at 25-30 degrees on SDA, septate hyphae are seen; hyphae have short or long conidiophores with round to pear shaped conidiaConidia can develop either at the apex of the conidiophore giving a lollipop-like appearance or directly along the hyphaeWhat organism am I describing?
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Sporothrix schenckii
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Histoplasma capsulatum
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Blastomyces dermatitidis
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Paracoccidioides brasiliensis
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Penicillium marneffei
Correct Answer
A. Blastomyces dermatitidisExplanation
The description provided matches the characteristics of Blastomyces dermatitidis. This fungus exhibits yeast-like growth at 25-30 degrees Celsius on SDA, which becomes prickly and eventually cottony with white aerial mycelium. The mycelium turns tan or brown with age, and the reverse side is tan. At 35-37 degrees Celsius, colonies of Blastomyces dermatitidis are cream to tan in color, heaped or wrinkled, and waxy. Microscopically, septate hyphae with short or long conidiophores and round to pear-shaped conidia are observed at 25-30 degrees Celsius on SDA.Rate this question:
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- 26.
At 25-30 degrees celsius on SDA, colonies are white to brown or pinkish with a fine, desne cottony texture; reverse is white but sometimes yellow or orange tanAt 35-37 degrees celsius on BHI, colonies are moist, white and yeastlike; the yeast phase is inhibited by cycloheximideMicroscopically, at 25-30 degrees celsius in young cultures, septate hyphae are seen; they bear round to pear-shaped smooth or occasionally spiny microconidia on short branches or dierectly on the sides of the hyphaeAfter several weeks, thick-walled, round macroconidia form; they are tuberulate, knobby or have short cylindrical projections.What dimorphic organism is being described?
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Sporothrix schenckii
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Histoplasma capsulatum
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Blastomyces dermatitidis
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Paracoccidioides brasiliensis
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Penicillium marneffei
Correct Answer
A. Histoplasma capsulatumExplanation
The given description of the organism includes characteristics such as colonies being moist, white and yeast-like at 35-37 degrees Celsius, and the presence of septate hyphae with round to pear-shaped smooth or occasionally spiny microconidia. These characteristics are consistent with the dimorphic fungus Histoplasma capsulatum, which is known to cause the disease histoplasmosis.Rate this question:
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- 27.
Slides Cultures can or should be done with Dimorphic fungi.
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True
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False
Correct Answer
A. FalseExplanation
Dimorphic fungi are fungi that can exist in two different forms depending on the environmental conditions, typically as a mold at lower temperatures and as a yeast at higher temperatures. Slides cultures, on the other hand, are a method of growing and observing microorganisms on glass slides under a microscope. While dimorphic fungi can be studied using slides cultures, it is not necessary or required to do so. Therefore, the statement that slides cultures can or should be done with dimorphic fungi is false.Rate this question:
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- 28.
Darling a pathologist who first recognized Histoplasma capsulatum in a patient believed the organism to be a parasite because of its size and staining characteristics and its presence within _______.
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Neutrophils
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Dendrites
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Histiocytes
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Endothelial cells
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Red blood cells
Correct Answer
A. HistiocytesExplanation
Darling, a pathologist who first recognized Histoplasma capsulatum in a patient, believed the organism to be a parasite because of its size and staining characteristics and its presence within histiocytes.Rate this question:
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- 29.
Choose the Geographical description that matches the fungi.Blastomyces dermatitidis
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Central and South America, Mexico, eastern Europe and in the north-central US
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Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers
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Endemic in North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries
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Northwestern, central and southwestern South America, Central America and southern Mexico
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Areas of Southeast Asia
Correct Answer
A. Endemic in North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributariesExplanation
The fungi Blastomyces dermatitidis is endemic in North America in areas surrounding the Mississippi, Missouri, and Ohio rivers and their tributaries. This means that the fungi is commonly found and restricted to this specific region. It is not found in other parts of the world such as Central and South America, Mexico, eastern Europe, Southeast Asia, or other regions of North America.Rate this question:
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- 30.
At 25-30 degrees celcisus smooth condiophores with 4-5 terminal metulae, each metula bearing 4-6 phialidesConidia are smooth or slightly rough and oval and form chains; short narrow extensions connect the conidiaConidia, when incubated at 35-37 degrees Celsius, form hyphal elements that will fragment at the septa, producing single-celled round to oval arthroconidia; these are referred to as yeastlike cells.No buds are produced; arthroconidia will reproduce by fission.What dimorphic organism am I talking about?
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Sporothrix schenckii
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Histoplasma capsulatum
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Blastomyces dermatitidis
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Paracoccidioides brasiliensis
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Penicillium marneffei
Correct Answer
A. Penicillium marneffeiExplanation
The given description of the organism includes characteristics such as smooth condiophores with terminal metulae, oval conidia that form chains, and the ability to form yeastlike cells at higher temperatures. These features are consistent with the dimorphic fungus Penicillium marneffei, which is known to exhibit these characteristics.Rate this question:
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- 31.
The exoantigen test is available for the detection of the H or M antigen of Histoplasma capsulatum; antiserum is tested against an extract of _____ colonies; bands that are continuous with or identical to the reference bands indicate the unknown mold is H. capsulatum.
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Yeast
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Mold
Correct Answer
A. MoldExplanation
The exoantigen test is used to detect the H or M antigen of Histoplasma capsulatum. In this test, antiserum is tested against an extract of mold colonies. If the bands observed in the test are continuous with or identical to the reference bands, it indicates that the unknown mold is H. capsulatum. Therefore, the correct answer is "Mold" as the test specifically detects the antigen in mold colonies.Rate this question:
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- 32.
Choose the Geographical description that matches the fungi.Sporothrix schenckii
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Central and South America, Mexico, eastern Europe and in the north-central US
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Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers
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North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries
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Northwestern, central and southwestern South America, Central America and southern Mexico
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Areas of Southeast Asia
Correct Answer
A. Central and South America, Mexico, eastern Europe and in the north-central USExplanation
The correct answer for the geographical description that matches the fungi Sporothrix schenckii is "northwestern, central and southwestern South America, Central America and southern Mexico".Rate this question:
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- 33.
Choose the Geographical description that matches the fungi.Paracoccidioides brasiliensis
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Central and South America, Mexico, eastern Europe and in the north-central US
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Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers
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Endemic in North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries
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Is endemic in northwestern, central and southwestern South America, Central America and southern Mexico
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Areas of Southeast Asia
Correct Answer
A. Is endemic in northwestern, central and southwestern South America, Central America and southern MexicoExplanation
The correct answer is "is endemic in northwestern, central and southwestern South America, Central America and southern Mexico." This explanation matches the geographical description of Paracoccidioides brasiliensis, stating that it is found in specific regions of South America, Central America, and southern Mexico.Rate this question:
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- 34.
Choose the Geographical description that matches the fungi.Histoplasma capsulatum
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Central and South America, Mexico, eastern Europe and in the north-central US
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Central North America in areas surrounding the Mississippi, Missouri and Ohio rivers
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North America in areas surrounding the Mississippi, Missouri and Ohio rivers and their tributaries
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Northwestern, central and southwestern South America, Central America and southern Mexico
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Areas of Southeast Asia
Correct Answer
A. Central North America in areas surrounding the Mississippi, Missouri and Ohio riversExplanation
The correct answer is "central North America in areas surrounding the Mississippi, Missouri and Ohio rivers". This is because the geographical description matches the distribution of Histoplasma capsulatum, a fungus commonly found in these regions.Rate this question:
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- 35.
Blastomyces dermatitidis matures within ______ days.
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7
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21
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14
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3
Correct Answer
A. 14Explanation
Blastomyces dermatitidis matures within 14 days.Rate this question:
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- 36.
How many weeks should Blastomyces dermatitidis be held before being discarded as negative.
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8
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4
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2
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6
Correct Answer
A. 8Explanation
Blastomyces dermatitidis should be held for 8 weeks before being discarded as negative. This is because it takes a significant amount of time for this fungus to grow and show visible signs of infection. Holding it for 8 weeks allows for sufficient time to observe any growth or changes, ensuring accurate results.Rate this question:
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- 37.
As with the other dimorphic fungi, mold growth occurs at 25-30 degrees celsius and yeat growth at 35-37 degrees celsiusMacroscopically, at 25-30 degrees celsius on SDA, the colony is white, heaped, compact, usually folded and almost glabrous or with a short nap of white aerial mycelium that often turns brown with age; reverse is light or brownishAt 37 degrees celsius, the yeast phase on BHI is heaped, cream to tan in color, mosit and soft; as the colony ages, it becomes more yeastlike and waxy.What dimorphic organism am I talking about?
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Sporothrix schenckii
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Histoplasma capsulatum
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Blastomyces dermatitidis
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Paracoccidioides brasiliensis
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Penicillium marneffei
Correct Answer
A. Paracoccidioides brasiliensisExplanation
The correct answer is Paracoccidioides brasiliensis because it is a dimorphic fungus that exhibits mold growth at 25-30 degrees celsius and yeast growth at 35-37 degrees celsius. Macroscopically, at 25-30 degrees celsius on SDA, the colony appears white, heaped, compact, and usually folded, with white aerial mycelium that may turn brown with age. At 37 degrees celsius on BHI, the yeast phase appears heaped, cream to tan in color, moist, and soft, becoming more yeast-like and waxy as the colony ages.Rate this question:
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- 38.
Macroconidia can resemble those of Sepedonium, but this fungus does not produce microconidia.
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Sporothrix schenckii
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Histoplasma capsulatum
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Blastomyces dermatitidis
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Paracoccidioides brasiliensis
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Penicillium marneffei
Correct Answer
A. Histoplasma capsulatumExplanation
Histoplasma capsulatum is the correct answer because the statement mentions that the fungus being described does not produce microconidia. Among the options given, only Histoplasma capsulatum fits this description. The other fungi listed may produce both macroconidia and microconidia.Rate this question:
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- 39.
When a dimorphic pathogen is isoleated, we try and convert it to the "_______" temperature.
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Higher
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Lower
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Opposite
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Same
Correct Answer
A. OppositeExplanation
When a dimorphic pathogen is isolated, we try and convert it to the opposite temperature. This means that if the pathogen is originally grown at a higher temperature, we try to culture it at a lower temperature, and vice versa. This is done to induce a change in the pathogen's morphology, as dimorphic pathogens can exist in two different forms depending on the temperature they are grown at. By exposing the pathogen to the opposite temperature, we can trigger a transition from one form to the other, allowing for further study and understanding of its behavior.Rate this question:
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