Q. What is the main mode of transmission for Clostridium perfringens?
A.
Airborne
B.
Fecal-oral
C.
Contaminated food
D.
Direct contact
Show solution
Solution
Clostridium perfringens is primarily transmitted through contaminated food, leading to food poisoning.
Correct Answer:
C
— Contaminated food
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Q. What is the main mode of transmission for Mycobacterium tuberculosis?
A.
Fecal-oral route
B.
Airborne droplets
C.
Direct contact
D.
Vector-borne
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Solution
Mycobacterium tuberculosis is primarily transmitted through airborne droplets when an infected person coughs or sneezes.
Correct Answer:
B
— Airborne droplets
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Q. What is the main mode of transmission for smallpox?
A.
Airborne droplets
B.
Fecal-oral route
C.
Vector-borne
D.
Direct contact with lesions
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Solution
Smallpox is primarily transmitted through direct contact with the lesions of an infected person.
Correct Answer:
D
— Direct contact with lesions
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Q. What is the main mode of transmission for the common cold?
A.
Airborne droplets
B.
Contaminated food
C.
Vector-borne
D.
Direct contact with blood
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Solution
The common cold is primarily transmitted through airborne droplets when an infected person coughs or sneezes.
Correct Answer:
A
— Airborne droplets
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Q. What is the main product of lactic acid fermentation?
A.
Ethanol
B.
Carbon dioxide
C.
Lactic acid
D.
Acetic acid
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Solution
Lactic acid is the main product of lactic acid fermentation, which occurs in certain bacteria and muscle cells.
Correct Answer:
C
— Lactic acid
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Q. What is the main protein found in cow's milk?
A.
Casein
B.
Whey
C.
Albumin
D.
Globulin
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Solution
Casein constitutes about 80% of the protein in cow's milk, while whey makes up the remaining 20%.
Correct Answer:
A
— Casein
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Q. What is the main purpose of cellular respiration?
A.
To produce glucose
B.
To convert glucose into ATP
C.
To absorb sunlight
D.
To release oxygen
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Solution
The main purpose of cellular respiration is to convert glucose into ATP, which is usable energy for cells.
Correct Answer:
B
— To convert glucose into ATP
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Q. What is the main purpose of root hairs in plants?
A.
Photosynthesis
B.
Water absorption
C.
Nutrient storage
D.
Gas exchange
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Solution
Root hairs increase the surface area of roots, enhancing the plant's ability to absorb water and nutrients from the soil.
Correct Answer:
B
— Water absorption
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Q. What is the main purpose of the feedback mechanisms in homeostasis?
A.
To amplify changes
B.
To maintain stability
C.
To initiate responses
D.
To increase metabolic rate
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Solution
Feedback mechanisms, such as negative feedback, help maintain stability in the body's internal environment.
Correct Answer:
B
— To maintain stability
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Q. What is the main purpose of the G1 checkpoint?
A.
To check DNA integrity
B.
To ensure proper chromosome alignment
C.
To assess cell size and nutrient availability
D.
To initiate DNA replication
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Solution
The G1 checkpoint assesses cell size and nutrient availability before allowing the cell to proceed to DNA synthesis.
Correct Answer:
C
— To assess cell size and nutrient availability
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Q. What is the main purpose of the pentose phosphate pathway in bacteria?
A.
ATP production
B.
NADPH production
C.
Fermentation
D.
Protein synthesis
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Solution
The pentose phosphate pathway primarily generates NADPH for biosynthetic reactions.
Correct Answer:
B
— NADPH production
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Q. What is the main role of algae in aquatic ecosystems?
A.
Decomposers
B.
Producers
C.
Consumers
D.
Predators
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Solution
Algae serve as primary producers, converting sunlight into energy through photosynthesis.
Correct Answer:
B
— Producers
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Q. What is the main role of the stem in a plant?
A.
Storage of nutrients
B.
Transport of nutrients and water
C.
Photosynthesis
D.
Reproduction
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Solution
The stem primarily functions to transport nutrients and water between roots and leaves.
Correct Answer:
B
— Transport of nutrients and water
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Q. What is the main route of transmission for cutaneous anthrax?
A.
Inhalation
B.
Ingestion
C.
Direct contact
D.
Vector-borne
Show solution
Solution
Cutaneous anthrax is primarily transmitted through direct contact with contaminated materials.
Correct Answer:
C
— Direct contact
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Q. What is the main source of Listeria monocytogenes in food?
A.
Raw meat
B.
Unpasteurized dairy products
C.
Fruits and vegetables
D.
Seafood
Show solution
Solution
Unpasteurized dairy products are a significant source of Listeria monocytogenes, which can cause serious illness.
Correct Answer:
B
— Unpasteurized dairy products
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Q. What is the main storage form of carbohydrates in the human body?
A.
Glucose
B.
Fructose
C.
Glycogen
D.
Sucrose
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Solution
Glycogen is the main storage form of carbohydrates in the body.
Correct Answer:
C
— Glycogen
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Q. What is the main symptom of an infection caused by Entamoeba histolytica?
A.
Fever
B.
Diarrhea
C.
Cough
D.
Skin rash
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Solution
Entamoeba histolytica primarily causes diarrhea, often with blood and mucus.
Correct Answer:
B
— Diarrhea
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Q. What is the main symptom of the plant disease caused by the cucumber mosaic virus?
A.
Yellowing of leaves
B.
Wilting
C.
Stunted growth
D.
Mosaic patterns on leaves
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Solution
The cucumber mosaic virus causes characteristic mosaic patterns on the leaves of infected plants.
Correct Answer:
D
— Mosaic patterns on leaves
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Q. What is the main target cell type for the rabies virus?
A.
Epithelial cells
B.
Neurons
C.
Liver cells
D.
Muscle cells
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Solution
Rabies virus primarily targets neurons, leading to neurological symptoms.
Correct Answer:
B
— Neurons
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Q. What is the main therapeutic use of ACE inhibitors?
A.
Hypertension
B.
Diabetes management
C.
Antibiotic therapy
D.
Pain relief
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Solution
ACE inhibitors are primarily used to treat hypertension by inhibiting the conversion of angiotensin I to angiotensin II.
Correct Answer:
A
— Hypertension
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Q. What is the main treatment for cholera caused by Vibrio cholerae?
A.
Antibiotics
B.
Intravenous fluids
C.
Antiviral medications
D.
Surgery
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Solution
The main treatment for cholera is the administration of intravenous fluids to prevent dehydration.
Correct Answer:
B
— Intravenous fluids
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Q. What is the main vaccine available for hepatitis prevention?
A.
Hepatitis A vaccine
B.
Hepatitis B vaccine
C.
Hepatitis C vaccine
D.
Hepatitis D vaccine
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Solution
The Hepatitis B vaccine is the main vaccine available for preventing hepatitis B infection.
Correct Answer:
B
— Hepatitis B vaccine
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Q. What is the main vector for the transmission of the Zika virus?
A.
Ticks
B.
Fleas
C.
Mosquitoes
D.
Lice
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Solution
The Zika virus is primarily transmitted to humans through the bite of infected Aedes mosquitoes.
Correct Answer:
C
— Mosquitoes
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Q. What is the main vector for the Zika virus?
A.
Aedes mosquito
B.
Culex mosquito
C.
Anopheles mosquito
D.
Tsetse fly
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Solution
The Aedes mosquito, particularly Aedes aegypti, is the primary vector for the Zika virus.
Correct Answer:
A
— Aedes mosquito
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Q. What is the mechanism of action of fluoroquinolones?
A.
Inhibition of cell wall synthesis
B.
Inhibition of protein synthesis
C.
Inhibition of DNA gyrase
D.
Inhibition of folic acid synthesis
Show solution
Solution
Fluoroquinolones inhibit DNA gyrase, which is essential for bacterial DNA replication.
Correct Answer:
C
— Inhibition of DNA gyrase
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Q. What is the mechanism of action of penicillin?
A.
Inhibition of protein synthesis
B.
Inhibition of cell wall synthesis
C.
Inhibition of nucleic acid synthesis
D.
Inhibition of folic acid synthesis
Show solution
Solution
Penicillin works by inhibiting cell wall synthesis, leading to bacterial lysis.
Correct Answer:
B
— Inhibition of cell wall synthesis
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Q. What is the mechanism of action of SSRIs (Selective Serotonin Reuptake Inhibitors)?
A.
Inhibition of serotonin reuptake
B.
Inhibition of dopamine receptors
C.
Inhibition of norepinephrine reuptake
D.
Activation of serotonin receptors
Show solution
Solution
SSRIs work by inhibiting the reuptake of serotonin in the brain, increasing its availability in the synaptic cleft.
Correct Answer:
A
— Inhibition of serotonin reuptake
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Q. What is the mechanism of action of SSRIs?
A.
Inhibition of serotonin reuptake
B.
Inhibition of dopamine reuptake
C.
Blocking norepinephrine receptors
D.
Increasing GABA activity
Show solution
Solution
SSRIs (Selective Serotonin Reuptake Inhibitors) work by inhibiting the reuptake of serotonin in the brain.
Correct Answer:
A
— Inhibition of serotonin reuptake
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Q. What is the mechanism of action of tetracyclines?
A.
Inhibition of cell wall synthesis
B.
Inhibition of protein synthesis
C.
Inhibition of nucleic acid synthesis
D.
Inhibition of folic acid synthesis
Show solution
Solution
Tetracyclines inhibit protein synthesis by binding to the 30S ribosomal subunit.
Correct Answer:
B
— Inhibition of protein synthesis
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Q. What is the mechanism of interaction between statins and grapefruit juice?
A.
Inhibition of statin absorption
B.
Inhibition of CYP3A4 metabolism
C.
Induction of statin metabolism
D.
Inhibition of LDL receptor activity
Show solution
Solution
Grapefruit juice inhibits CYP3A4, which is responsible for the metabolism of many statins, leading to increased statin levels and risk of side effects.
Correct Answer:
B
— Inhibition of CYP3A4 metabolism
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