Questions and answers for exam Preparation

MCQs

Total Questions : 118 | Page 3 of 12 pages

Question 21. Which of the following do not show stereo specificity?

L-lactate dehydrogenase
Epimerase
Salivary α-amylase
L-glucose oxidase

Discuss Question

Answer: Option B. -> Epimerase
Answer: (b).Epimerase

Question 22. Which type of specificity is represented in the following reaction?
Glucose \(_{\overrightarrow{Glucokinase}}\) Glucose-6-phosphate

Relative substrate specificity
Absolute substrate specificity
Broad substrate specificity
Stereo specificity

Discuss Question

Answer: Option B. -> Absolute substrate specificity
Answer: (b).Absolute substrate specificity

Question 23. The enzymes having allosteric sites, other than catalytic site which is used for binding for regulatory metabolites is referred to as _________

isoenzyme
biosensor
allosteric enzymes
effectors

Discuss Question

Answer: Option C. -> allosteric enzymes
Answer: (c).allosteric enzymes

Question 24. Which of the following is not true for allosteric enzyme?

Greek word ‘allo’ means other and ‘steros’ means site
Enzymes having other site
Regulatory metabolites are called effector or modulator or modifier
Each of two or more enzymes with identical function but different structure

Discuss Question

Answer: Option D. -> Each of two or more enzymes with identical function but different structure
Answer: (d).Each of two or more enzymes with identical function but different structure

Question 25. Which of the following is not an example of absolute substrate specificity?

Glucose to glucose-6-phosphate by glucokinase
Hexokinase phosphorylating one or more kind of hexoses
Lactose to glucose and galactose by lactase
Urea to ammonia by urease

Discuss Question

Answer: Option B. -> Hexokinase phosphorylating one or more kind of hexoses
Answer: (b).Hexokinase phosphorylating one or more kind of hexoses

Question 26. Effectors that inhibit enzyme activity are termed as ____________

positive effectors
modulators
negative effectors
inhibitor

Discuss Question

Answer: Option C. -> negative effectors
Answer: (c).negative effectors

Question 27. ________ is referred to as effectors which increase the enzyme activity.

Positive effectors
Modifier
Negative effectors
Inhibitor

Discuss Question

Answer: Option A. -> Positive effectors
Answer: (a).Positive effectors

Question 28. Which of the following is not an inhibitor of pyruvate dehydrogenase in conversion pyruvate to acetyl CoA?

Citrate
ATP
NADH
Acetyl CoA

Discuss Question

Answer: Option A. -> Citrate
Answer: (a).Citrate

Question 29. Which of the following is not true of feedback allosteric inhibition in multienzyme system?

First enzyme of the sequence is regulatory allosteric enzyme
The enzyme is inhibited by the end product of the multienzyme system
Allosteric enzymes obey Miachelis-Menten kinetics
The whole enzyme system slows down to bring the rate of production of its end product back into balance when the cell needs it

Discuss Question

Answer: Option C. -> Allosteric enzymes obey Miachelis-Menten kinetics
Answer: (c).Allosteric enzymes obey Miachelis-Menten kinetics

Question 30. Which of the enzyme ATP does not act as an inhibitor?