Antibodies and Immune System MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Antibodies and Immune System, a fundamental topic in the field of Microbiology. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Antibodies and Immune System MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Antibodies and Immune System mcq questions that explore various aspects of Antibodies and Immune System problems. Each MCQ is crafted to challenge your understanding of Antibodies and Immune System principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Microbiology tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Antibodies and Immune System MCQs are your pathway to success in mastering this essential Microbiology topic.

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Antibodies and Immune System MCQs | Page 7 of 14

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Q61.
The affinity of an enzyme for its substrate, when the enzyme has a Km of 0.50 M will be __________ than the affinity of an enzyme for its substrate when the enzyme has a Km of 0.05 M.

a.

greater

b.

lesser

c.

approximately equal

d.

half

Discuss
Answer: (b).lesser
Q62.
Anthranilate synthase, the first enzyme of tryptophan biosynthesis after the branch point shows feedback inhibition and repression due to

a.

L-tryptophan

b.

D-L-tryptophan hydantoin

c.

L-serine

d.

pyruvate

Discuss
Answer: (a).L-tryptophan
Q63.
A substrate binds to its enzyme at a location called the __________ site.

a.

coenzyme

b.

substrate

c.

active

d.

polypeptide

Discuss
Answer: (c).active
Q64.
Hydrogen and oxygen release enormous amounts of energy when they react. Yet, hydrogen and oxygen can be mixed together in a balloon and nothing will happen. Why?

a.

Competitive inhibitors are blocking the reaction from occurring in the active site

b.

There must be contaminating elements in the balloon that prohibit the reaction from occurring

c.

The energy of activation to form the transition-state complex is too high to allow the reaction to occur without assistance

d.

all of the above

Discuss
Answer: (a).Competitive inhibitors are blocking the reaction from occurring in the active site
Q65.
Adenosine triphosphate is a type of

a.

fatty acid

b.

amino acid

c.

nucleotide

d.

steroid

Discuss
Answer: (c).nucleotide
Q66.
An enzyme that is always produced, regardless of the presence of substrates or the end products, is called

a.

a constitutive enzyme

b.

an isoenzyme

c.

a repressible enzyme

d.

an allosteric enzyme

Discuss
Answer: (a).a constitutive enzyme
Q67.
About 7.3 kcal/mole are released when

a.

glucose is converted to CO2 and H2O

b.

NAD+ is reduced to NADH

c.

ATP hydrolysis is coupled to sucrose synthesis

d.

the terminal phosphate bond of ATP is broken by hydrolysis

Discuss
Answer: (a).glucose is converted to CO2 and H2O
Q68.
The ability of CTP to bind to aspartate carbamoyltransferase and shut down the synthesis of more CTP is an example of

a.

enzyme induction

b.

enzyme repression

c.

feedback inhibition of enzyme activity

d.

none of these

Discuss
Answer: (c).feedback inhibition of enzyme activity
Q69.
Oxidation is the

a.

loss of proton

b.

gain of electron

c.

loss of electron

d.

gain of protons

Discuss
Answer: (c).loss of electron
Q70.
Denaturation of an enzyme refers to the

a.

improper arrangement of the enzyme in a metabolic pathway

b.

loss of the enzymes proper shape

c.

formation of the enzymes proper shape

d.

formation of a new isozyme for that enzyme

Discuss
Answer: (b).loss of the enzymes proper shape
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