Q. What is the average alcohol by volume (ABV) percentage in most beers?
A.
2-4%
B.
4-6%
C.
6-8%
D.
8-10%
Show solution
Solution
Most beers typically have an alcohol by volume (ABV) percentage of 4-6%.
Correct Answer:
B
— 4-6%
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Q. What is the basic building block of DNA?
A.
Amino acid
B.
Nucleotide
C.
Fatty acid
D.
Monosaccharide
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Solution
DNA is composed of nucleotides, which are the basic building blocks.
Correct Answer:
B
— Nucleotide
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Q. What is the basic structure of an amino acid?
A.
A central carbon atom, an amino group, a carboxyl group, and a side chain
B.
A central nitrogen atom, a carboxyl group, and a side chain
C.
A central carbon atom, two carboxyl groups, and a side chain
D.
A central carbon atom, an amino group, and a hydroxyl group
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Solution
The basic structure of an amino acid includes a central carbon atom, an amino group (-NH2), a carboxyl group (-COOH), and a variable side chain (R group).
Correct Answer:
A
— A central carbon atom, an amino group, a carboxyl group, and a side chain
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Q. What is the basic unit of DNA?
A.
Nucleotide
B.
Amino acid
C.
Monosaccharide
D.
Fatty acid
Show solution
Solution
DNA is composed of nucleotides, which are the basic building blocks.
Correct Answer:
A
— Nucleotide
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Q. What is the basic unit of the genetic code?
A.
Codon
B.
Anticodon
C.
Gene
D.
Chromosome
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Solution
A codon is a sequence of three nucleotides that corresponds to a specific amino acid.
Correct Answer:
A
— Codon
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Q. What is the benefit of using special proteins in biofortification?
A.
Increased yield
B.
Enhanced flavor
C.
Improved disease resistance
D.
Higher nutrient content
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Solution
Biofortification aims to increase the nutrient content of crops, often through the introduction of special proteins.
Correct Answer:
D
— Higher nutrient content
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Q. What is the best practice for storing opened canned foods?
A.
Leave in the can at room temperature
B.
Transfer to a glass or plastic container
C.
Re-seal the can with tape
D.
Store in the original can in the fridge
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Solution
Opened canned foods should be transferred to a glass or plastic container to prevent chemical leaching and preserve quality.
Correct Answer:
B
— Transfer to a glass or plastic container
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Q. What is the best way to prevent foodborne illness?
A.
Washing hands frequently
B.
Cooking food to proper temperatures
C.
Storing food correctly
D.
All of the above
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Solution
All of the above methods are effective in preventing foodborne illness.
Correct Answer:
D
— All of the above
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Q. What is the characteristic feature of Clostridium species in laboratory culture?
A.
Aerobic growth
B.
Facultative anaerobic growth
C.
Strict anaerobic growth
D.
Microaerophilic growth
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Solution
Clostridium species are strict anaerobes, meaning they grow in the absence of oxygen.
Correct Answer:
C
— Strict anaerobic growth
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Q. What is the characteristic shape of spirilla bacteria?
A.
Spherical
B.
Rod-shaped
C.
Spiral
D.
Coccus
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Solution
Spirilla bacteria are characterized by their spiral shape.
Correct Answer:
C
— Spiral
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Q. What is the complementary base pair for adenine in DNA?
A.
Thymine
B.
Cytosine
C.
Guanine
D.
Uracil
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Solution
In DNA, adenine pairs with thymine through hydrogen bonds.
Correct Answer:
A
— Thymine
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Q. What is the consequence of excessive protein intake on renal function?
A.
Decreased glomerular filtration rate
B.
Increased urea production
C.
Decreased urine output
D.
Increased potassium retention
Show solution
Solution
Excessive protein intake leads to increased urea production, which can put stress on the kidneys and affect their function.
Correct Answer:
B
— Increased urea production
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Q. What is the direction of DNA strand synthesis during replication?
A.
5' to 3'
B.
3' to 5'
C.
Both directions
D.
Random direction
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Solution
DNA strands are synthesized in the 5' to 3' direction.
Correct Answer:
A
— 5' to 3'
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Q. What is the effect of a competitive inhibitor on enzyme activity?
A.
Increases reaction rate
B.
Decreases reaction rate
C.
No effect on reaction rate
D.
Changes the enzyme's structure
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Solution
A competitive inhibitor decreases the reaction rate by competing with the substrate for the active site.
Correct Answer:
B
— Decreases reaction rate
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Q. What is the effect of agitation on blood samples during laboratory testing?
A.
It has no effect
B.
It can cause hemolysis
C.
It improves sample quality
D.
It decreases sample volume
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Solution
Agitation can cause hemolysis, which can interfere with laboratory test results.
Correct Answer:
B
— It can cause hemolysis
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Q. What is the effect of alcohol on the metabolism of acetaminophen?
A.
Increases its metabolism to non-toxic metabolites
B.
Decreases its metabolism, increasing toxicity
C.
Increases its metabolism to toxic metabolites
D.
Has no effect on its metabolism
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Solution
Chronic alcohol consumption induces CYP2E1, which increases the metabolism of acetaminophen to toxic metabolites, raising the risk of liver damage.
Correct Answer:
C
— Increases its metabolism to toxic metabolites
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Q. What is the effect of aldosterone on renal function?
A.
Increases sodium reabsorption
B.
Decreases potassium reabsorption
C.
Increases water excretion
D.
Decreases blood pressure
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Solution
Aldosterone increases sodium reabsorption in the kidneys, which helps to increase blood volume and blood pressure.
Correct Answer:
A
— Increases sodium reabsorption
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Q. What is the effect of allosteric inhibition on enzyme activity?
A.
Increases substrate affinity
B.
Decreases enzyme activity
C.
Increases product formation
D.
Has no effect on enzyme structure
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Solution
Allosteric inhibition decreases enzyme activity by altering the enzyme's conformation.
Correct Answer:
B
— Decreases enzyme activity
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Q. What is the effect of glucagon on blood glucose levels?
A.
Increases blood glucose
B.
Decreases blood glucose
C.
Has no effect
D.
Regulates blood pressure
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Solution
Glucagon is a hormone that increases blood glucose levels by promoting glycogenolysis and gluconeogenesis in the liver.
Correct Answer:
A
— Increases blood glucose
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Q. What is the effect of gravity on fluid flow in the human body?
A.
Increases flow in all positions
B.
Decreases flow in all positions
C.
Varies with body position
D.
Has no effect
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Solution
Gravity affects fluid flow in the body, varying with body position; for example, it increases venous return when standing.
Correct Answer:
C
— Varies with body position
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Q. What is the effect of heating acidic canned foods?
A.
Increases shelf life
B.
Decreases nutrient absorption
C.
May cause chemical leaching from the can
D.
Enhances flavor
Show solution
Solution
Heating acidic canned foods can cause chemical leaching from the can, which may pose health risks.
Correct Answer:
C
— May cause chemical leaching from the can
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Q. What is the effect of high glucose levels on the lac operon?
A.
Increased transcription
B.
Decreased transcription
C.
No effect
D.
Inhibition of repressor
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Solution
High glucose levels lead to low cAMP levels, which decreases the transcription of the lac operon.
Correct Answer:
B
— Decreased transcription
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Q. What is the effect of hyperventilation on blood pH?
A.
Increases pH (alkalosis)
B.
Decreases pH (acidosis)
C.
No effect on pH
D.
Causes respiratory failure
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Solution
Hyperventilation leads to decreased carbon dioxide levels in the blood, resulting in increased pH and respiratory alkalosis.
Correct Answer:
A
— Increases pH (alkalosis)
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Q. What is the effect of increased blood osmolarity on ADH secretion?
A.
Increases ADH secretion
B.
Decreases ADH secretion
C.
No effect on ADH secretion
D.
Inhibits ADH action
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Solution
Increased blood osmolarity stimulates the secretion of ADH, which promotes water reabsorption in the kidneys.
Correct Answer:
A
— Increases ADH secretion
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Q. What is the effect of increased calcium ion concentration in the presynaptic terminal?
A.
Inhibition of neurotransmitter release
B.
Promotion of neurotransmitter release
C.
No effect on neurotransmitter release
D.
Degradation of neurotransmitters
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Solution
Increased calcium ion concentration in the presynaptic terminal triggers the fusion of neurotransmitter-containing vesicles with the membrane, promoting neurotransmitter release.
Correct Answer:
B
— Promotion of neurotransmitter release
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Q. What is the effect of increasing substrate concentration on fermentation rate?
A.
Increases indefinitely
B.
Decreases
C.
Increases to a point then levels off
D.
Has no effect
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Solution
Increasing substrate concentration typically increases fermentation rate to a saturation point, after which it levels off.
Correct Answer:
C
— Increases to a point then levels off
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Q. What is the effect of increasing temperature on enzyme activity up to a certain point?
A.
Decreases activity
B.
Increases activity
C.
No effect
D.
Denatures the enzyme
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Solution
Increasing temperature generally increases enzyme activity up to an optimal point, beyond which denaturation occurs.
Correct Answer:
B
— Increases activity
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Q. What is the effect of increasing the voltage during gel electrophoresis?
A.
Increases the resolution of bands
B.
Decreases the migration time
C.
Increases the size of the gel
D.
Decreases the temperature of the gel
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Solution
Increasing the voltage decreases the migration time, allowing the samples to move faster through the gel.
Correct Answer:
B
— Decreases the migration time
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Q. What is the effect of moderate wine consumption on heart health?
A.
Increases risk
B.
No effect
C.
Decreases risk
D.
Only harmful for women
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Solution
Moderate wine consumption has been associated with a decreased risk of heart disease.
Correct Answer:
C
— Decreases risk
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Q. What is the effect of oxytocin during childbirth?
A.
Inhibits uterine contractions
B.
Stimulates uterine contractions
C.
Promotes milk production
D.
Decreases blood pressure
Show solution
Solution
Oxytocin is released during childbirth to stimulate uterine contractions, facilitating labor and delivery.
Correct Answer:
B
— Stimulates uterine contractions
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