Q. What is the effect of pasteurization on milk?
-
A.
Increases fat content
-
B.
Destroys harmful bacteria
-
C.
Enhances flavor
-
D.
Increases lactose content
Solution
Pasteurization is a heat treatment process that destroys harmful bacteria in milk.
Correct Answer:
B
— Destroys harmful bacteria
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Q. What is the effect of pH on enzyme activity?
-
A.
Enzymes work best at any pH
-
B.
Each enzyme has an optimal pH range
-
C.
pH has no effect on enzyme activity
-
D.
All enzymes are active at neutral pH only
Solution
Each enzyme has an optimal pH range where it functions best; deviations can lead to decreased activity or denaturation.
Correct Answer:
B
— Each enzyme has an optimal pH range
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Q. What is the effect of pH on peptide solubility?
-
A.
It has no effect
-
B.
It can increase solubility at all pH levels
-
C.
It can decrease solubility at certain pH levels
-
D.
It only affects hydrophobic peptides
Solution
The solubility of peptides can be affected by pH, as it influences the ionization of amino acid side chains.
Correct Answer:
C
— It can decrease solubility at certain pH levels
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Q. What is the effect of pH on protein stability?
-
A.
Only affects solubility
-
B.
Can lead to denaturation
-
C.
Has no effect
-
D.
Only affects enzymatic activity
Solution
pH can lead to denaturation, affecting protein stability and function.
Correct Answer:
B
— Can lead to denaturation
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Q. What is the effect of protein binding on drug distribution?
-
A.
Increases free drug concentration
-
B.
Decreases free drug concentration
-
C.
Has no effect on drug distribution
-
D.
Increases drug metabolism
Solution
Protein binding decreases the free drug concentration available for distribution, as only unbound drugs can exert pharmacological effects.
Correct Answer:
B
— Decreases free drug concentration
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Q. What is the effect of St. John's Wort on the metabolism of certain drugs?
-
A.
Inhibits CYP450 enzymes
-
B.
Induces CYP450 enzymes
-
C.
Has no effect on drug metabolism
-
D.
Inhibits P-glycoprotein
Solution
St. John's Wort is known to induce CYP450 enzymes, which can lead to decreased effectiveness of drugs metabolized by these enzymes.
Correct Answer:
B
— Induces CYP450 enzymes
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Q. What is the effect of sympathetic stimulation on the heart?
-
A.
Decreases heart rate
-
B.
Increases heart rate
-
C.
Has no effect
-
D.
Decreases stroke volume
Solution
Sympathetic stimulation increases heart rate and contractility, preparing the body for 'fight or flight' responses.
Correct Answer:
B
— Increases heart rate
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Q. What is the effect of temperature on enzyme activity according to thermodynamic principles?
-
A.
Increases indefinitely
-
B.
Decreases indefinitely
-
C.
Increases to an optimal point then decreases
-
D.
Has no effect
Solution
Enzyme activity typically increases with temperature to an optimal point, after which it decreases due to denaturation.
Correct Answer:
C
— Increases to an optimal point then decreases
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Q. What is the effect of temperature on enzyme activity?
-
A.
Increases indefinitely
-
B.
Decreases indefinitely
-
C.
Increases to an optimal point then decreases
-
D.
Has no effect
Solution
Enzyme activity typically increases with temperature to an optimal point, after which it decreases due to denaturation.
Correct Answer:
C
— Increases to an optimal point then decreases
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Q. What is the effect of thyroid hormones on metabolism?
-
A.
Decrease metabolic rate
-
B.
Increase metabolic rate
-
C.
No effect on metabolism
-
D.
Regulate calcium metabolism
Solution
Thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), increase the metabolic rate and influence various metabolic processes.
Correct Answer:
B
— Increase metabolic rate
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Q. What is the effect of trans fats on health?
-
A.
Increase HDL levels
-
B.
Decrease LDL levels
-
C.
Increase inflammation
-
D.
Have no effect on cholesterol
Solution
Trans fats are known to increase inflammation and are associated with higher LDL cholesterol levels.
Correct Answer:
C
— Increase inflammation
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Q. What is the effect of uncouplers on oxidative phosphorylation?
-
A.
Increase ATP production
-
B.
Decrease oxygen consumption
-
C.
Increase heat production
-
D.
Inhibit electron transport
Solution
Uncouplers disrupt the proton gradient, leading to increased heat production instead of ATP.
Correct Answer:
C
— Increase heat production
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Q. What is the effect of vasodilation on blood flow?
-
A.
Increases blood flow
-
B.
Decreases blood flow
-
C.
Has no effect on blood flow
-
D.
Causes blood to clot
Solution
Vasodilation refers to the widening of blood vessels, which increases blood flow to tissues.
Correct Answer:
A
— Increases blood flow
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Q. What is the end product of complete fatty acid oxidation?
-
A.
Glucose
-
B.
Acetyl-CoA
-
C.
Fatty acids
-
D.
Carbon dioxide and water
Solution
The complete oxidation of fatty acids results in carbon dioxide and water, along with ATP production.
Correct Answer:
D
— Carbon dioxide and water
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Q. What is the end product of glycolysis?
-
A.
Pyruvate
-
B.
Acetyl-CoA
-
C.
Lactic Acid
-
D.
Glucose
Solution
The end product of glycolysis is pyruvate.
Correct Answer:
A
— Pyruvate
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Q. What is the end product of lactic acid fermentation?
-
A.
Ethanol
-
B.
Lactic acid
-
C.
Acetic acid
-
D.
Carbon dioxide
Solution
Lactic acid fermentation results in the production of lactic acid.
Correct Answer:
B
— Lactic acid
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Q. What is the end product of the Krebs cycle?
-
A.
Glucose
-
B.
Lactic acid
-
C.
Carbon dioxide and water
-
D.
Acetyl-CoA
Solution
The end products of the Krebs cycle are carbon dioxide and water, along with electron carriers NADH and FADH2.
Correct Answer:
C
— Carbon dioxide and water
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Q. What is the end product of the urea cycle?
-
A.
Uric acid
-
B.
Ammonia
-
C.
Urea
-
D.
Creatinine
Solution
The end product of the urea cycle is urea, which is excreted in urine.
Correct Answer:
C
— Urea
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Q. What is the energy yield of one molecule of glucose during aerobic respiration?
-
A.
2 ATP
-
B.
30-32 ATP
-
C.
36-38 ATP
-
D.
4 ATP
Solution
The complete oxidation of one molecule of glucose during aerobic respiration yields approximately 30-32 ATP.
Correct Answer:
C
— 36-38 ATP
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Q. What is the fate of excess amino acids in the body?
-
A.
Stored as proteins
-
B.
Converted to glucose
-
C.
Converted to fatty acids
-
D.
Excreted unchanged
Solution
Excess amino acids are typically converted to glucose through gluconeogenesis or stored as fat.
Correct Answer:
B
— Converted to glucose
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Q. What is the first line of defense in the immune system?
-
A.
B cells
-
B.
T cells
-
C.
Physical barriers
-
D.
Cytokines
Solution
Physical barriers, such as skin and mucous membranes, constitute the first line of defense against pathogens.
Correct Answer:
C
— Physical barriers
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Q. What is the first step of protein synthesis?
-
A.
Translation
-
B.
Transcription
-
C.
Post-translational modification
-
D.
Amino acid activation
Solution
Transcription is the first step of protein synthesis, where mRNA is synthesized from DNA.
Correct Answer:
B
— Transcription
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Q. What is the first-line treatment for a confirmed Streptococcus pyogenes infection?
-
A.
Amoxicillin
-
B.
Azithromycin
-
C.
Penicillin
-
D.
Ciprofloxacin
Solution
Penicillin is the first-line treatment for a confirmed Streptococcus pyogenes infection.
Correct Answer:
C
— Penicillin
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Q. What is the first-line treatment for active tuberculosis?
-
A.
Amoxicillin
-
B.
Isoniazid
-
C.
Ciprofloxacin
-
D.
Vancomycin
Solution
Isoniazid is one of the first-line medications used to treat active tuberculosis.
Correct Answer:
B
— Isoniazid
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Q. What is the first-line treatment for brucellosis?
-
A.
Amoxicillin
-
B.
Doxycycline
-
C.
Ciprofloxacin
-
D.
Azithromycin
Solution
Doxycycline is commonly used as a first-line treatment for brucellosis, often in combination with rifampin.
Correct Answer:
B
— Doxycycline
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Q. What is the function of a silencer in gene regulation?
-
A.
To enhance transcription
-
B.
To inhibit transcription
-
C.
To splice RNA
-
D.
To replicate DNA
Solution
A silencer is a regulatory element that inhibits transcription when bound by specific proteins.
Correct Answer:
B
— To inhibit transcription
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Q. What is the function of a viral envelope?
-
A.
To protect the host cell
-
B.
To aid in attachment to host cells
-
C.
To replicate viral DNA
-
D.
To produce proteins
Solution
The viral envelope helps the virus attach to and enter host cells.
Correct Answer:
B
— To aid in attachment to host cells
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Q. What is the function of aldolase in glycolysis?
-
A.
Phosphorylation
-
B.
Cleavage
-
C.
Isomerization
-
D.
Dehydrogenation
Solution
Aldolase catalyzes the cleavage of fructose-1,6-bisphosphate into two three-carbon sugars.
Correct Answer:
B
— Cleavage
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Q. What is the function of antifreeze proteins in crops?
-
A.
Preventing freezing damage
-
B.
Enhancing nutrient uptake
-
C.
Increasing growth rate
-
D.
Improving flavor profile
Solution
Antifreeze proteins prevent freezing damage by lowering the freezing point of water in plant cells.
Correct Answer:
A
— Preventing freezing damage
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Q. What is the function of antioxidants in the diet?
-
A.
To provide energy
-
B.
To support immune function
-
C.
To protect cells from damage
-
D.
To aid in digestion
Solution
Antioxidants help protect cells from oxidative stress and damage caused by free radicals.
Correct Answer:
C
— To protect cells from damage
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