Microorganism Qiuz 1
Microorganisms – or microbes – are microscopic organisms that can exist in their single-celled form, or in a colony of cells. They are organisms that cannot be seen with the naked eye, but with a microscope, hence the name.
- 1.
Disease-causing microorganisms are called
- A.
Decomposers
- B.
Procaryotes
- C.
Pathogens
- D.
Eucaryotes
- E.
Fermenters
Correct Answer
C. Pathogens -
- 2.
The microorganisms that recycle nutrients by breaking down dead matter and wastes are called
- A.
Decomposers
- B.
Prokaryotes
- C.
Pathogens
- D.
Eukaryotes
- E.
Fermenters
Correct Answer
A. Decomposers -
- 3.
The microorganisms that do not have a nucleus in their cells are called
- A.
Decomposers
- B.
Prokaryotes
- C.
Pathogens
- D.
Eukaryotes
- E.
Fermenters
Correct Answer
B. Prokaryotes -
- 4.
All microorganisms are best defined as organisms that
- A.
Cause human disease
- B.
Lack a cell nucleus
- C.
Are infectious particles
- D.
Are too small to be seen with the unaided eye
- E.
Can only be found growing in laboratories
Correct Answer
D. Are too small to be seen with the unaided eye -
- 5.
Which of the following is a unique characteristic of viruses that distinguishes them from the other major group of microorganism?
- A.
Cause human disease
- B.
Lack a nucleus
- C.
Cannot be seen without a microscope
- D.
Contain genetic material
- E.
Lack cell structure
Correct Answer
E. Lack cell structure -
- 6.
Koch's postulates are criteria used to establish that
- A.
Microbes are found on dust particles
- B.
A specific microbe is the cause of a specific disease
- C.
Life forms can only arise from preexisting life forms
- D.
A specific microbe should be classified in a specific kingdom
- E.
Microbes can be used to clean up toxic spills
Correct Answer
B. A specific microbe is the cause of a specific disease -
- 7.
Which of the following is a proper scientific name?
- A.
Streptoccoci pyogenes
- B.
Bacillus subtilis
- C.
B. subtilis
- D.
Bacillus subtilis
- E.
Streptocci
Correct Answer
D. Bacillus subtilis -
- 8.
The study of evolutionary relationships among organisms is called
- A.
Biotechnology
- B.
Genetics
- C.
Recombinant DNA
- D.
Phylogeny
- E.
Taxonomy
Correct Answer
D. Phylogeny -
- 9.
The surgeon who advocated using disinfectants on hands and in the air prior to surgery was
- A.
Joseph Lister
- B.
Ignaz Semmelweis
- C.
Robert Koch
- D.
Louis Pasteur
- E.
Antonis van leewenhoek
Correct Answer
A. Joseph Lister -
- 10.
The term sterile means free of all life forms
- A.
True
- B.
False
Correct Answer
A. True -
- 11.
Select the correct descending taxonomic hierarchy(left to right)
- A.
Family, order, class
- B.
Family, genus, species
- C.
Genus, species, family
- D.
Class, phylum, order
- E.
Kingdom, domain, phylum
Correct Answer
B. Family, genus, species -
- 12.
A friend has told you that he thinks that the world would be a safer place if all bacteria could be destroyed. Which of the following would be true if his suggestion were carries out?
- A.
There would be no infectious diseases in humans
- B.
Pets would be free of disease
- C.
Certain foods such as beer, cheese, or yogurt could not be made easily
- D.
There would be no ability to make medicines
Correct Answer
C. Certain foods such as beer, cheese, or yogurt could not be made easily -
- 13.
Anything that occupies space and has mass is called
- A.
An electron
- B.
Living
- C.
Matter
- D.
Energy
- E.
Space
Correct Answer
C. Matter -
- 14.
The subatomic particles that surround the nucleus are the
- A.
Electrons
- B.
Protons
- C.
Neutrons
- D.
Protons and neutrons
- E.
Protons and electrons
Correct Answer
A. Electrons -
- 15.
Cations are
- A.
Charged subatomic particles
- B.
Atoms that have gained electrons
- C.
Radioactive isotopes
- D.
Capable of forming ionic bonds with anions
- E.
Atoms without protons
Correct Answer
D. Capable of forming ionic bonds with anions -
- 16.
The prominent building blocks of an enzyme are
- A.
Nucleotides
- B.
Glycerol and fatty acids
- C.
Monosaccharides
- D.
Phosphate, glycerol, fatty acids
- E.
Amino acids
Correct Answer
E. Amino acids -
- 17.
The polynucleotides strands of DNA are linked along their length by___________ bonds between the bases
- A.
Covalent
- B.
Ionic
- C.
Van der Waals
- D.
Double
- E.
Hydrogen
Correct Answer
E. Hydrogen -
- 18.
The type of chemical bond linking amino acids together is a(n)
- A.
Glycosidic bond
- B.
Peptide bond
- C.
Ester bond
- D.
Ionic bond
- E.
Hydrogen bond
Correct Answer
B. Peptide bond -
- 19.
Which of the following is the stored form of carbohydrates in animals?
- A.
Glycogen
- B.
Maltose
- C.
Starch
- D.
Cellulose
- E.
Galactose
Correct Answer
A. Glycogen -
- 20.
The o< helix and B-pleated sheet are examples of
- A.
Primary structure
- B.
Secondary structure
- C.
Tertiary structure
- D.
Quaternary structure
- E.
Gamma structures
Correct Answer
B. Secondary structure -
- 21.
The five I's of studying microorganisms include all of the following except
- A.
Inoculation
- B.
Incubation
- C.
Infection
- D.
Isolation
- E.
Identification
Correct Answer
C. Infection -
- 22.
The term that refers to the purposeful assition of micoorganisms into a laboratory nutrient medium is
- A.
Isolation
- B.
Inoculation
- C.
Immunization
- D.
Infection
- E.
Contamination
Correct Answer
B. Inoculation -
- 23.
Which of the following is essential for development of discrete, isolated colonies?
- A.
Broth medium
- B.
Differential medium
- C.
Selective medium
- D.
Solid medium
- E.
Assay medium
Correct Answer
D. Solid medium -
- 24.
A pure culture contains only
- A.
One species of microorganism
- B.
Bacteria
- C.
A variety of microbes from one source
- D.
A variety of species from the same genus
- E.
None of the choices are correct
Correct Answer
A. One species of microorganism -
- 25.
A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in the culture. what is the most likely explanation?
- A.
The microbiologist used too much inoculum
- B.
The culture is contaminated
- C.
The incubation temperature was incorrect
- D.
The culture medium must be selective
- E.
The culture medium must be differential
Correct Answer
B. The culture is contaminated -
- 26.
The microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium. Following incubation, only the E. coli grows in the culture. What is the most likely explanation?
- A.
The microbiologist used too much inoculum
- B.
The culture is contaminated
- C.
The incubation temperature was incorrect
- D.
The culture medium must be selective
- E.
The culture medium must be differential
Correct Answer
D. The culture medium must be selective -
- 27.
A nutrient medium that has all of its chemical components identified and their precise concentrations known and reproducible would be termed
- A.
Complex
- B.
Reducing
- C.
Enriched
- D.
Enumeration
- E.
Synthetic
Correct Answer
E. Synthetic -
- 28.
The type of mictoscope in which you would see brightly illuminated specimens against a black background is
- A.
Bright field
- B.
Dark field
- C.
Phase contrast
- D.
Fluorescence
- E.
Electron
Correct Answer
B. Dark field -
- 29.
This microscope does not use light in forming the specimen image
- A.
Bright field
- B.
Dark field
- C.
Phase contrast
- D.
Fluorescence
- E.
Electron
Correct Answer
E. Electron -
- 30.
This microscope is the most widely used and shows cells against a bright background
- A.
Bright field
- B.
Dark field
- C.
Phase contrast
- D.
Fluorescence
- E.
Electron
Correct Answer
A. Bright field -
- 31.
The Gram stain, acid fast stain and endospore stain have the following in common
- A.
Used on a wet mount of the specimen
- B.
Use heat to force the dye into cell structures
- C.
Outcome based on cell wall differences
- D.
Use a negative stain technique
- E.
Are differential stains
Correct Answer
E. Are differential stains -
- 32.
Media that contains extracts from plants, animals, or yeasts are
- A.
Synthetic
- B.
Complex
- C.
Reducing
- D.
Enriched
- E.
All of the choices are correct
Correct Answer
D. Enriched -
- 33.
Brain-heart infusion, trypticase soy agar (TSA) and nutrient agar are all examples of which type of media?
- A.
Synthetic
- B.
Reducing
- C.
Enriched
- D.
Nonsynthetic
- E.
Selective
Correct Answer
D. Nonsynthetic -
- 34.
Bacteria that require special growth factors and complex organic subatances are called
- A.
Fastidious
- B.
Pathogenic
- C.
Harmless
- D.
Anaerobic
- E.
Aerobic
Correct Answer
A. Fastidious -
- 35.
Which type of media can be used to determine if a bacteria is motile?
- A.
Sim
- B.
MacConkey
- C.
Enriched media
- D.
Thayer-Martin media
- E.
Chocolate agar
Correct Answer
A. Sim -
- 36.
All of the following are correct about agar except
- A.
It is flexible
- B.
It melts at the bioling point of water (100C)
- C.
It is a source of nutrition for bacteria
- D.
It solidifies below 42C
- E.
It is a solid at room temperature
Correct Answer
C. It is a source of nutrition for bacteria -
- 37.
Spirochetes have a twisting and flexing locomotion due to appendages called
- A.
Flagella
- B.
Cilia
- C.
Fimbriae
- D.
Periplasmic flagella (axil filaments)
- E.
Sex pili
Correct Answer
D. Periplasmic flagella (axil filaments) -
- 38.
All bacterial cells have
- A.
A chromosome
- B.
Fimbriae
- C.
Endospores
- D.
Capsules
- E.
Flagella
Correct Answer
A. A chromosome -
- 39.
The term that refers to the presence of flagella all over the cell suface is
- A.
Amphitrichous
- B.
Atrichous
- C.
Lophotrichous
- D.
Monotrichous
- E.
Peritrichous
Correct Answer
E. Peritrichous -
- 40.
The outcome of the Gram stain is based on differences in the cell's
- A.
Ribosomes
- B.
Inclusions
- C.
Cell wall
- D.
Cell membrane
- E.
Flagella
Correct Answer
C. Cell wall -
- 41.
A bacterial cell exhibiting chemataxis probably has
- A.
Fimbriae
- B.
Capsule
- C.
Mesosomes
- D.
Flagella
- E.
Metachromatic granules
Correct Answer
D. Flagella -
- 42.
Which structure protects bacteria from being phagocytized?
- A.
Slime layer
- B.
Fimbriae
- C.
Cell membrane
- D.
Capsule
- E.
All of the choices are correct
Correct Answer
D. Capsule -
- 43.
A procaryotic cell wall that has primarily peptidoglycan with small amounts of teichoic acid and lipoteichoic acid is
- A.
Gram neg
- B.
Gram positive
- C.
Archaea
- D.
Spheroplast
- E.
Acid fast
Correct Answer
B. Gram positive -
- 44.
A bacterial genus that has waxy mycolic acid in the cell walls is
- A.
Myocbacterium
- B.
Mycoplasma
- C.
Streptococcus
- D.
Corynebacterium
- E.
Salmonella
Correct Answer
A. Myocbacterium -
- 45.
Lipopolysaccharide is an important cell wall component of
- A.
Gram negative bacteria
- B.
Gram positive bacteria
- C.
Acid fast bacteria
- D.
Mycoplasmas
- E.
Protoplasts
Correct Answer
A. Gram negative bacteria -
- 46.
The bacterial chromosome
- A.
Is located in the cell membrane
- B.
Contains all the cell's plasmids
- C.
Is part of the nucleoid
- D.
Forms a single linear strand of DNA
- E.
All of the choices are correct
Correct Answer
C. Is part of the nucleoid -
- 47.
Which is mismatched?
- A.
Ribosomes-- protein synthesis
- B.
Inclusions-- excess cell nutrients and materials
- C.
Plasmids -- genes essential for growth and metabolism
- D.
Nucleoid-- hereditary material
- E.
Cytoplasm-- dense, gelatinous solution
Correct Answer
C. Plasmids -- genes essential for growth and metabolism -
- 48.
The function of bacterial endospores is
- A.
To convert gaseous nitrogen to a usable form for plants
- B.
For reproduction and growth
- C.
For protection of genetic material during harsh conditions
- D.
The storage of excess cell materials
- E.
To have sites for photosynthesis
Correct Answer
C. For protection of genetic material during harsh conditions -
- 49.
Which term is not used to describe bacterial cell shapes?
- A.
Coccus
- B.
Tetrad
- C.
Vibrio
- D.
Rod
- E.
Spirochete
Correct Answer
B. Tetrad -
- 50.
Which statement is not a characteristic of biofilms?
- A.
They can be involved with human disease
- B.
They involve bacteria only
- C.
They evolve and adapt to their surroundings
- D.
They are very difficult to eliminate with antimicrobials
Correct Answer
B. They involve bacteria only -
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Nov 09, 2017Quiz Edited by
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Jul 15, 2010Quiz Created by
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