Tough Biology Test - Only For The Smartest
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Think you are a Biology expert? Let us tell you, this biology test is like no other. This has some difficult questions which require immense knowledge and a lot of brainstorming to answer. If you pass this quiz, you have successfully been entered into the category of intelligent biology enthusiasts. Take this quiz to find out where you stand and learn more along the way.
- 1.
Which of the following applies to a multicellular organism that has a single opening acts as both mouth and anus
- A.
Extracellular, simple digestive system
- B.
extracellular, complex, complete digestive system
- C.
Extracellular, complex, incomplete digestive system
- D.
Intracellular, with the food being engulfed by a single cell
Correct Answer
C. Extracellular, complex, incomplete digestive systemExplanation
A multicellular organism that has a single opening acting as both the mouth and anus would have an extracellular digestive system because digestion occurs outside of the cells. It would be considered complex because it involves multiple organs and processes. However, it would be considered incomplete because it lacks a separate opening for waste elimination, resulting in the need for the same opening to serve both functions.Rate this question:
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- 2.
What is the difference between an autotroph and a heterotroph?
- A.
Heterotrophs cannot make their own food, autotrophs can make their own food.
- B.
Autotrophs cannot make their own food, heterotrophs can make their own food.
- C.
Heterotrophs can make their own food using chemical energy, autotrophs can make their own food using light energy.
- D.
Heterotrophs can make their own food using light energy, autotrophs can make their own food using chemical.
Correct Answer
A. Heterotrophs cannot make their own food, autotrophs can make their own food.Explanation
Autotrophs are organisms that can produce their own food through processes like photosynthesis or chemosynthesis, using energy from the sun or chemicals. On the other hand, heterotrophs are unable to produce their own food and rely on consuming other organisms or organic matter for nutrition. Therefore, the statement "Heterotrophs cannot make their own food, autotrophs can make their own food" correctly explains the difference between autotrophs and heterotrophs.Rate this question:
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- 3.
What nutrients are missing in the diet of person suffering from kwashiorkor?
- A.
Vitamin D
- B.
Vitamin C
- C.
Complete protein.
- D.
Carbohydrates
Correct Answer
C. Complete protein.Explanation
Kwashiorkor is a severe form of malnutrition caused by inadequate protein intake. Protein is essential for growth, repair, and maintenance of body tissues. A person suffering from kwashiorkor has a diet lacking in complete protein, which means they are not getting all the essential amino acids necessary for proper functioning of the body. The other nutrients mentioned, such as vitamin D, vitamin C, and carbohydrates, may also be lacking in the diet, but the primary nutrient missing in kwashiorkor is complete protein.Rate this question:
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- 4.
What is the difference between a gram calorie (gcal) and a dietary calorie (kcal)?
- A.
1 kcal = 1000 gcal
- B.
1000 kcal = 1 gcal
- C.
10 kcal = 1 gcal
- D.
10 gcal = 1 kcal
Correct Answer
A. 1 kcal = 1000 gcalExplanation
A gram calorie (gcal) is a unit of energy equal to the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. On the other hand, a dietary calorie (kcal), also known as a kilocalorie, is a unit of energy commonly used in nutrition to measure the energy content of food. One dietary calorie is equal to 1000 gram calories. Therefore, the correct answer is 1 kcal = 1000 gcal.Rate this question:
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- 5.
Why must some fats be in the diet?
- A.
Fats are the only course of energy in the diet.
- B.
Fats are the only source of vitamins in the B complex and vitamin C
- C.
Only fats can provide a source of water in the diet by metabolic breakdown of the lipid molecules
- D.
Fats in the diet contain essential fatty acids and carry fat-solutble vitamins
Correct Answer
D. Fats in the diet contain essential fatty acids and carry fat-solutble vitaminsExplanation
Fats in the diet contain essential fatty acids and carry fat-soluble vitamins. Essential fatty acids are necessary for the body to function properly and cannot be produced by the body, so they must be obtained through the diet. Fat-soluble vitamins, such as vitamins A, D, E, and K, can only be absorbed and utilized by the body when consumed with dietary fats. Therefore, including fats in the diet is important to ensure an adequate intake of essential fatty acids and fat-soluble vitamins.Rate this question:
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- 6.
Which of the following is one of the five components of food but is NOT an energy source in food?
- A.
fats and oils (lipids)
- B.
proteins
- C.
vitamins
- D.
Carbohydrates
Correct Answer
C. vitaminsExplanation
Vitamins are essential components of food but they do not directly provide energy to the body. They play a crucial role in various metabolic processes and are required in small amounts for the proper functioning of the body. While carbohydrates, fats, and proteins are macronutrients that provide energy, vitamins are micronutrients that support overall health and help in the utilization of energy obtained from other nutrients.Rate this question:
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- 7.
Autotrophs differ from heterotrophs in that autotrophs
- A.
Cannot make their own food while heterotrophs can.
- B.
Can make their own food while heterotrophs must have an outside supply of organic materials.
- C.
do not require minerals while heterotrophs do require an outside source of minerals.
- D.
Equire minerals while heterotrophs do not require an outside source of minerals
Correct Answer
B. Can make their own food while heterotrophs must have an outside supply of organic materials.Explanation
Autotrophs are organisms that can produce their own food through photosynthesis or chemosynthesis, using energy from the sun or inorganic compounds. They do not rely on an outside source of organic materials for their nutrition. On the other hand, heterotrophs cannot produce their own food and must obtain organic materials from external sources. They depend on autotrophs or other heterotrophs for their energy and nutrient requirements. Therefore, the statement "can make their own food while heterotrophs must have an outside supply of organic materials" accurately describes the difference between autotrophs and heterotrophs.Rate this question:
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- 8.
What is an essential nutrient?
- A.
A nutrient that is found in all foods regardless of composition
- B.
A nutrient that is not made in the body and must be supplied in the diet
- C.
A nutrient that contains aromatic essential oils for flavor
- D.
None of the above are correct.
Correct Answer
B. A nutrient that is not made in the body and must be supplied in the dietExplanation
An essential nutrient is a nutrient that is not made in the body and must be supplied in the diet. This means that the body is unable to produce these nutrients on its own and therefore they must be obtained from external sources such as food. These essential nutrients are necessary for the proper functioning of the body and to maintain good health.Rate this question:
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- 9.
What is the nutrient makeup of a bag of fertilizer that is labeled 25-10-3?
- A.
25% N (nitrogen), 10% P (phosphorous), 3% K (potassium)
- B.
25% useable nitrogen, 10% nonusable nitrogen, 3% inert filler
- C.
25% total nitrogen, 10% useable nitrogen, 3% inert filler
- D.
25% P (phosphorous), 10% N (nitrogen), 3% K (potassium)
Correct Answer
A. 25% N (nitrogen), 10% P (phosphorous), 3% K (potassium)Explanation
The correct answer is 25% N (nitrogen), 10% P (phosphorous), 3% K (potassium). This answer accurately represents the nutrient makeup of the fertilizer labeled 25-10-3, indicating that it contains 25% nitrogen, 10% phosphorous, and 3% potassium.Rate this question:
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- 10.
What does a closed cirulatory system have that an open circulatory system does not have?
- A.
Capillaries
- B.
heart
- C.
vessels
- D.
Liquid such as blood or hemolymph
Correct Answer
A. CapillariesExplanation
A closed circulatory system has capillaries, which are tiny blood vessels that connect arteries and veins, allowing for the exchange of nutrients, gases, and waste products between the blood and surrounding tissues. An open circulatory system, on the other hand, lacks capillaries and instead has a fluid called hemolymph that directly bathes the organs and tissues. Therefore, capillaries are a unique feature of a closed circulatory system that allows for more efficient and targeted transport of substances throughout the body.Rate this question:
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- 11.
What is a vein?
- A.
A vessel that carries only deoxygenated blood
- B.
A vessel that carries only oxygenated blood
- C.
A vessel that carries blood away from the heart
- D.
A vessel that carries blood toward the heart
Correct Answer
D. A vessel that carries blood toward the heartExplanation
A vein is a type of blood vessel that carries blood toward the heart. Unlike arteries, which carry oxygenated blood away from the heart, veins carry deoxygenated blood back to the heart. This is an important function as it allows the blood to be reoxygenated and recirculated throughout the body. Veins have valves that help prevent the backflow of blood and ensure efficient blood flow towards the heart.Rate this question:
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- 12.
What causes varicose veins?
- A.
Excess fat in the diet.
- B.
Valves become incompetent and allow blood to pool in the vein, causing the vein to dilate permanently
- C.
High blood pressure causes the vein to dilate
- D.
Excess salt in the diet
Correct Answer
B. Valves become incompetent and allow blood to pool in the vein, causing the vein to dilate permanentlyExplanation
When the valves in the veins become incompetent, they are unable to properly regulate the flow of blood. This leads to blood pooling in the veins, specifically in the legs, causing them to become dilated and twisted, resulting in varicose veins. The pooling of blood puts pressure on the walls of the veins, weakening them and causing them to enlarge and become permanently dilated.Rate this question:
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- 13.
What is the function of the right ventricle?
- A.
Recieve blood from the lungs
- B.
Recieve blood from the body
- C.
Pump blood to the lungs
- D.
Pump blood to the body
Correct Answer
C. Pump blood to the lungsExplanation
The right ventricle is responsible for pumping blood to the lungs. This is because the right side of the heart receives deoxygenated blood from the body and sends it to the lungs to be oxygenated. The oxygenated blood is then returned to the left side of the heart to be pumped to the rest of the body. Therefore, the right ventricle plays a crucial role in the pulmonary circulation, ensuring that oxygen-depleted blood is properly oxygenated in the lungs before being distributed throughout the body.Rate this question:
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- 14.
What do the valves of the heart and veins do?
- A.
Store blood for emergency use
- B.
Prevent backflow of blood
- C.
Direct blood to the appropriate vessel at branch points in the circulatory system
- D.
to cut off blood flow to injured parts of the body
Correct Answer
B. Prevent backflow of bloodExplanation
The valves of the heart and veins prevent backflow of blood. When the heart contracts, the valves open to allow blood to flow forward, and then they close to prevent blood from flowing backward. Similarly, the valves in the veins ensure that blood only flows in one direction, towards the heart. This prevents the blood from pooling or flowing in the wrong direction, ensuring efficient circulation throughout the body.Rate this question:
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- 15.
The most primitive vertebrate heart is that of a fish. This heart is composed of
- A.
2 atria and 2 ventricles
- B.
1 atrium and 2 ventricles
- C.
2 atria and 1 ventricle
- D.
1 atrium and 1 ventricle
Correct Answer
D. 1 atrium and 1 ventricleExplanation
The most primitive vertebrate heart is that of a fish, which is composed of 1 atrium and 1 ventricle. This is because fish have a single circulation system called single circulation, where blood flows through the heart only once in each complete circuit of the body. The atrium receives deoxygenated blood from the body and transfers it to the ventricle, which then pumps the blood to the gills for oxygenation. This simple structure of the heart is found in fish, while more complex structures are present in higher vertebrates.Rate this question:
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- 16.
What are systole and diastole?
- A.
Systole is the higher blood pressure caused by the contraction of the heart; diastole is the lower pressure when the heart relaxes
- B.
Systole is the lower blood pressure when the heart relaxes; diastole is the higher blood pressure caused by the contraction of the heart
- C.
Systole is the chest pressure caused by infilling the lungs due to inhalation; diastole occurs when air is exhaled.
- D.
responses to stress on skeletal muscles measuring the ability of the muscles to contract and relax with each heartbeat
Correct Answer
A. Systole is the higher blood pressure caused by the contraction of the heart; diastole is the lower pressure when the heart relaxesExplanation
Systole refers to the higher blood pressure that occurs during the contraction of the heart, while diastole refers to the lower pressure that happens when the heart relaxes. This explanation correctly identifies the relationship between systole and diastole in terms of blood pressure and the cardiac cycle.Rate this question:
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- 17.
What happens when a cardiac muscle cell becomes depolarized?
- A.
Dies
- B.
Relaxes
- C.
Contracts
- D.
Produces ATP
Correct Answer
C. ContractsExplanation
When a cardiac muscle cell becomes depolarized, it means that the cell's membrane potential becomes more positive. This change in membrane potential triggers the opening of voltage-gated calcium channels, allowing calcium ions to enter the cell. The influx of calcium ions then leads to the release of more calcium ions from the sarcoplasmic reticulum. These calcium ions bind to the contractile proteins within the cell, initiating the process of muscle contraction. Therefore, the correct answer is that the cardiac muscle cell contracts when it becomes depolarized.Rate this question:
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- 18.
What is the natural pacemaker of the heart?
- A.
Atrioventricular node
- B.
Bundle of His
- C.
Left atrial wall
- D.
Sinoatrial node in the right atrium
Correct Answer
D. Sinoatrial node in the right atriumExplanation
The sinoatrial (SA) node, located in the right atrium of the heart, is known as the natural pacemaker. It generates electrical impulses that regulate the heart's rhythm and initiate each heartbeat. These impulses cause the atria to contract, followed by the ventricles, allowing for efficient blood flow throughout the body. The SA node sets the pace for the entire heart, making it the primary pacemaker.Rate this question:
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- 19.
Which mineral is directly involved in the blood clotting cascade?
- A.
Selenium
- B.
Calcium
- C.
Zinc
- D.
molybdenum
Correct Answer
B. CalciumExplanation
Calcium is directly involved in the blood clotting cascade. When there is a cut or injury, calcium ions are released, which triggers a series of reactions leading to the formation of a blood clot. Calcium is essential for the activation of clotting factors and the conversion of prothrombin to thrombin, which is crucial for clot formation. Without adequate calcium levels, the blood clotting process would be impaired, leading to excessive bleeding. Therefore, calcium plays a vital role in ensuring effective blood clotting.Rate this question:
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- 20.
Plants typically obtain ____ from the atmosphere and _____ from the soil
- A.
Water; minerals
- B.
Carbon dioxide; water and minerals
- C.
Water; carbon dioxide
- D.
Mineral; water
Correct Answer
B. Carbon dioxide; water and mineralsExplanation
Plants typically obtain carbon dioxide from the atmosphere through tiny pores called stomata on their leaves. They also absorb water and minerals from the soil through their roots. These substances are essential for photosynthesis, the process by which plants convert carbon dioxide and water into glucose and oxygen.Rate this question:
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- 21.
What is required for plants to lead a dual existence?
- A.
A mechanism for photosynthesis to occur
- B.
A mechanism for transfer of materials between above ground below ground parts of the plant
- C.
A mechanism to collect water
- D.
A mechanism to support the plant
Correct Answer
B. A mechanism for transfer of materials between above ground below ground parts of the plantExplanation
Plants need a mechanism for the transfer of materials between their above-ground and below-ground parts in order to lead a dual existence. This is because plants obtain nutrients and water from the soil through their roots, and these materials need to be transported to the leaves for photosynthesis and other metabolic processes. Similarly, the products of photosynthesis, such as sugars, need to be transported from the leaves to other parts of the plant for growth and development. Therefore, a mechanism for the transfer of materials is essential for plants to function and thrive.Rate this question:
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- 22.
Xylem
- A.
Transports water and minerals in a plant.
- B.
Is composed of cells that are dead a maturity
- C.
Is the only tissue in a plant in which photosynthesis occurs.
Correct Answer(s)
A. Transports water and minerals in a plant.
B. Is composed of cells that are dead a maturityExplanation
Xylem is a type of tissue in plants that is responsible for transporting water and minerals from the roots to the rest of the plant. It consists of specialized cells called tracheids and vessel elements that are dead at maturity, allowing for efficient water movement. This transportation system plays a crucial role in supplying the necessary nutrients for plant growth and survival.Rate this question:
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- 23.
Loss of water from a leaf through the stomata is called
- A.
Transpiration.
- B.
Translocation
- C.
transportation.
Correct Answer
A. Transpiration.Explanation
Transpiration is the process by which water is lost from the leaves of a plant through the stomata. Stomata are small openings on the surface of leaves that allow for gas exchange, but they also result in the loss of water vapor. This loss of water helps to maintain the plant's internal water balance and is an important factor in the movement of water through the plant. Translocation refers to the movement of organic compounds in the phloem, while transportation is a general term that can refer to the movement of any substance within a plant or organism.Rate this question:
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- 24.
Which of the following are part of the stomata?
- A.
Xylem cells
- B.
Phloem cells
- C.
Guard cells
Correct Answer
C. Guard cellsExplanation
Guard cells are the correct answer because stomata are small openings on the surface of leaves and stems that allow for gas exchange. Guard cells surround the stomata and control their opening and closing. Xylem cells and phloem cells, on the other hand, are part of the vascular system of plants and are responsible for transporting water, nutrients, and sugars throughout the plant. They are not directly involved in the functioning of stomata.Rate this question:
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- 25.
What evidence supports the TACT theory?
- A.
Xylem is under negative (inward) pressure
- B.
Xylem is under positive (outward) pressure
- C.
Aphids do not require energy to feed on plant sap
- D.
Cut flowers will not wilt if no water is provided to them
Correct Answer
A. Xylem is under negative (inward) pressureExplanation
The evidence that supports the TACT theory is that xylem is under negative (inward) pressure. This suggests that water is being pulled up from the roots to the rest of the plant, rather than being pushed up by positive pressure. This is consistent with the TACT theory, which proposes that transpiration, adhesion, cohesion, and tension are responsible for the movement of water in plants.Rate this question:
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- 26.
Phloem cells are:
- A.
Alive at maturity and thin-walled
- B.
Dead at maturity and thin-walled
- C.
Alive at maturity and thick-walled
- D.
Dead at maturity and thick-walled
Correct Answer
A. Alive at maturity and thin-walledExplanation
Phloem cells are alive at maturity and thin-walled because they need to transport sugars and other organic nutrients from the leaves to other parts of the plant. Being alive allows them to actively transport these substances, while being thin-walled ensures efficient nutrient transport. This is in contrast to xylem cells, which are dead at maturity and have thick walls, as their main function is to transport water and minerals from the roots to the rest of the plant.Rate this question:
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- 27.
He energy for water transport in a plant comes from
- A.
series of pumplike cells in the root xylem
- B.
Series of pumplike cells in the leaf xylem.
- C.
He evaporation of water from a leaf caused by heat in the plant's environment (for example, the sun).
- D.
Photosynthesis.
Correct Answer
C. He evaporation of water from a leaf caused by heat in the plant's environment (for example, the sun).Explanation
The correct answer is the evaporation of water from a leaf caused by heat in the plant's environment (for example, the sun). This is because water is transported in plants through a process called transpiration, which involves the loss of water vapor through the stomata on the leaves. As water evaporates from the leaf surface, it creates a negative pressure that pulls water up through the xylem vessels from the roots to the leaves. This process is driven by the heat in the plant's environment, such as sunlight, which increases the rate of evaporation.Rate this question:
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- 28.
What evidence supports the pressure-flow hypothesis?
- A.
Phloem is under negative (inward) pressure
- B.
Phloem is under positive (outward) pressure.
- C.
Aphids do not require energy to feed on plant sap.
Correct Answer(s)
B. Phloem is under positive (outward) pressure.
C. Aphids do not require energy to feed on plant sap.Explanation
The evidence that supports the pressure-flow hypothesis is that phloem is under positive (outward) pressure. This means that the movement of sugars and other nutrients in the phloem sap is driven by a pressure gradient from source to sink. Additionally, the fact that aphids do not require energy to feed on plant sap further supports this hypothesis, as it suggests that the sap is under pressure and can be easily accessed by the aphids.Rate this question:
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- 29.
What evidence supports the pressure-flow hypothesis?
- A.
Phloem is under negative (inward) pressure
- B.
Phloem is under positive (outward) pressure.
- C.
Aphids do not require energy to feed on plant sap.
Correct Answer(s)
B. Phloem is under positive (outward) pressure.
C. Aphids do not require energy to feed on plant sap.Explanation
The evidence that supports the pressure-flow hypothesis is that the phloem is under positive (outward) pressure. This means that the sap in the phloem is pushed from areas of high pressure to areas of low pressure, allowing for the movement of nutrients and sugars throughout the plant. Additionally, the fact that aphids do not require energy to feed on plant sap also supports this hypothesis, as it suggests that the sap is under enough pressure to be easily accessed by the aphids without any additional effort.Rate this question:
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- 30.
Does the root act as a source or a sink in the pressure-flow hypothesis?
- A.
Sink
- B.
Source
Correct Answer
A. SinkExplanation
In the pressure-flow hypothesis, the root acts as a sink. This means that it is the site where sugars and other nutrients are actively transported and taken up from the phloem, which is the tissue responsible for transporting these substances throughout the plant. The root absorbs these nutrients from the soil and uses them for growth and metabolism. Therefore, the root is considered a sink because it is the destination or the "sinking" point for these nutrients.Rate this question:
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- 31.
What is the lytic phase of a viral "life" cycle?
- A.
The host cell bursts open to release viral particles
- B.
The point where the host cell undergoes mitosis
- C.
The point where the host cell undergoes meiosis.
- D.
The virus undergoes protein synthesis, using viral ribosomes and viral nuclear DNA
Correct Answer
A. The host cell bursts open to release viral particlesExplanation
During the lytic phase of a viral "life" cycle, the host cell bursts open to release viral particles. This occurs after the virus has infected the host cell, taken control of its machinery, replicated its genetic material, and synthesized new viral components. The accumulation of viral particles eventually causes the host cell to rupture, allowing the released viruses to infect other cells and continue the infection cycle.Rate this question:
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- 32.
Which of the following is NOT part of the structure of a virus?
- A.
Surrounding cell membrane taken over from a host cell
- B.
Protein capsid
- C.
Nucleus
- D.
Core of nucleic acid
Correct Answer
C. Nucleus -
- 33.
Which of the following results from blockage of the lymph vessels?
- A.
Heart disease
- B.
enlarged limbs (elephantiasis)
- C.
Stroke
- D.
Colon cancer
Correct Answer
B. enlarged limbs (elephantiasis)Explanation
Blockage of the lymph vessels can lead to a condition called elephantiasis, which is characterized by the swelling and enlargement of limbs. When the lymphatic system is unable to properly drain fluid from the tissues, it can result in the accumulation of fluid and subsequent swelling, particularly in the limbs. This condition is often caused by parasitic infections transmitted through mosquito bites, which can obstruct the lymphatic vessels and impair their function. Therefore, the correct answer is enlarged limbs (elephantiasis).Rate this question:
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- 34.
What is your primary defense against parasitic invaders?
- A.
intact skin
- B.
Humoral immunity
- C.
Cell-mediated immunity
- D.
Proper clothing
Correct Answer
A. intact skinExplanation
Intact skin serves as a physical barrier that prevents parasitic invaders from entering the body. It acts as the first line of defense by preventing the entry of pathogens and parasites. The skin's outer layer, known as the epidermis, is composed of tightly packed cells that provide a protective barrier against microorganisms. Additionally, the skin produces antimicrobial peptides that can kill or inhibit the growth of invading parasites. Therefore, intact skin is an essential defense mechanism against parasitic invaders.Rate this question:
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- 35.
What is an antigen?
- A.
A protein produced by the immune system that attacks a specific invader
- B.
A gereralized protein produced by the immune system that attacks an invader
- C.
A substance that supresses an immune response
- D.
A substance that invokes an immune response
Correct Answer
D. A substance that invokes an immune responseExplanation
An antigen is a substance that invokes an immune response. When introduced into the body, antigens stimulate the immune system to produce antibodies, which are proteins that recognize and bind to specific antigens. This immune response is the body's way of defending itself against foreign invaders such as bacteria, viruses, or other pathogens. Antigens can also be present on the surface of cells, allowing the immune system to distinguish between self and non-self cells.Rate this question:
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- 36.
Which of the following is NOT one of the four symptoms of the inflammatory response?
- A.
rubor (redness)
- B.
Dolor (pain)
- C.
calor (warm)
- D.
Turgor (swelling)
- E.
Balor (bleeding)
Correct Answer
E. Balor (bleeding)Explanation
The correct answer is "balor (bleeding)". The inflammatory response is a protective mechanism of the body in response to injury or infection, characterized by four classic symptoms: rubor (redness), dolor (pain), calor (warmth), and turgor (swelling). Bleeding is not a symptom of the inflammatory response, as it is not a direct result of the body's immune system reacting to an injury or infection.Rate this question:
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- 37.
What cells keep you from getting the measles a second time
- A.
Macrophages
- B.
Memory B- and T- cells
- C.
Memory B cells
- D.
Memory T cells
- E.
Red blood cells
- F.
Stem cells
Correct Answer
B. Memory B- and T- cellsExplanation
Memory B- and T-cells are responsible for preventing a person from getting the measles a second time. These cells are part of the immune system and are formed after the initial exposure to the measles virus. Memory B-cells produce antibodies specific to the measles virus, while memory T-cells recognize and destroy infected cells. When a person is re-exposed to the measles virus, these memory cells quickly recognize it and mount a rapid and effective immune response, preventing the person from getting infected again.Rate this question:
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- 38.
What are autoimmune diseases?
- A.
Diseases that you catch in a car.
- B.
Disease caused by an animal, such as a tapeworm
- C.
Disease cause by the immune system attacking healthy tissue for no apparent cause
- D.
Diseased cause by the immune system reacting to non-threatening substances, such as pollen
Correct Answer
C. Disease cause by the immune system attacking healthy tissue for no apparent causeExplanation
Autoimmune diseases are conditions in which the immune system mistakenly attacks and damages healthy tissues in the body without any apparent reason. This means that the immune system, which is supposed to protect the body from harmful substances, starts targeting its own cells and tissues, causing inflammation and damage. Unlike diseases caused by external factors like animals or non-threatening substances, autoimmune diseases arise from the body's own immune response.Rate this question:
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