82 + Mcqs in General Page 1 McqOptions

1.	Normal range of MCHC is
A.	10 5 gm%
B.	25 2 gm%
C.	35 3 gm%
D.	40 3 gm%
Answer» D. 40 3 gm%

Discussion

2.	MCHC is
A.	Volume of single RBC
B.	Average amount of haemoglobin in a single RBC in picogram
C.	Average amount of haemoglobin in a single RBC in percentage
D.	never less than 38%
Answer» D. never less than 38%

Discussion

3.	Average RBC count in an adult male is
A.	4.5 million/mm
B.	5 million/mm
C.	5.5 million/mm
D.	6 million/mm
Answer» D. 6 million/mm

Discussion

4.	Average volume of an RBC is _________ m 3;
A.	72
B.	86
C.	96
D.	120
Answer» C. 96

Discussion

5.	Average mean corpuscular diameter is ____________ m
A.	5.1
B.	6.3
C.	7.3
D.	8.5
Answer» D. 8.5

Discussion

6.	In sickle cell anaemia the defect lies in which polypeptide chain -
A.	-chain
B.	-chain
C.	-chain
D.	-chain
Answer» C. -chain

Discussion

7.	Which of the following is false about feedback regulation?
A.	It is a type of enzymatic activity regulation
B.	The synthesis of concerned enzyme is inhibited by interfering with the gene of that enzyme
C.	Concentration of enzyme is reduced by the end product
D.	The best example is the biosynthesis of L-isoleucine from L-threonine in bacteria
Answer» E.

Discussion

8.	Which of the following enzyme catalyzes a reaction that introduces reduced nitrogen ito cellular metabolism?
A.	Bacterial glutamine synthase
B.	Bacterial dinitrogenase reductase
C.	Bacterial dinitrogenase oxidase
D.	Phosphatase
Answer» B. Bacterial dinitrogenase reductase

Discussion

9.	Which of the following takes place due to phosphorylation of isocitrate dehydrogenase?
A.	Inhibits the binding of citrate at active site
B.	Degrades the enzyme
C.	Enhances the substrate-binding affinity
D.	No reaction
Answer» B. Degrades the enzyme

Discussion

10.	The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ___________
A.	Diphteria toxin and cholera toxin
B.	Dinitrogenase reductase
C.	Protein phosphatases
D.	Protein kinases
Answer» E.

Discussion

11.	Which of the following enzymes catalyze the ADP-ribosylation of key cellular enzymes or proteins?
A.	Diphteria toxin and cholera toxin
B.	Dinitrogenase reductase
C.	Protein phosphatases
D.	Kinase
Answer» B. Dinitrogenase reductase

Discussion

12.	Removal of phosphoryl groups is catalyzed by ___________
A.	Diphteria toxin and cholera toxin
B.	Dinitrogenase reductase
C.	Protein phosphatases
D.	Protein kinases
Answer» D. Protein kinases

Discussion

13.	Which type of attachment between the molecule and the enzyme changes the enzymatic activity?
A.	Metallic
B.	Covalent
C.	Peptide
D.	Glycosidic bond
Answer» C. Peptide

Discussion

14.	Which of the following enzyme is responsible for the regulation of biological nitrogen fixation?
A.	Dinitrogenase reductase
B.	Dinitrogenase oxidase
C.	Phosphatase
D.	Kinase
Answer» B. Dinitrogenase oxidase

Discussion

15.	Which enzymes are termed as allosteric enzymes?
A.	Those having active site
B.	Those having allosteric site
C.	Those having modifiers
D.	All of the above
Answer» E.

Discussion

16.	Which of the following is false about allosteric feedback inhibition?
A.	Bacterial enzyme system is the first known example
B.	Conversion of L-leucine to L-isoleucine
C.	Threonine dehydratase is inhibited by isoleucine
D.	If the isoleucine concentration decreases, the rate of threonine dehydration increases
Answer» C. Threonine dehydratase is inhibited by isoleucine

Discussion

17.	Why are regulatory enzymes needed?
A.	Control the enzymatic activity
B.	Regulate the enzyme synthesis
C.	Both
D.	None
Answer» D. None

Discussion

18.	How many types of enzymatic regulation mechanism occurs in the cells?
A.	2
B.	3
C.	4
D.	5
Answer» E.

Discussion

19.	Which is the enzyme that acts as a regulatory enzyme in a four-step metabolic pathway?
A.	First enzyme
B.	Fourth enzyme
C.	Second enzyme
D.	Third enzyme
Answer» B. Fourth enzyme

Discussion

20.	What are regulatory enzymes?
A.	One involved in protein synthesis
B.	Those involved in enzyme synthesis
C.	Those involved In regulating the enzyme activity
D.	None of the above
Answer» D. None of the above

Discussion

21.	What are isoenzymes?
A.	Same size of enzyme but different function
B.	Different function different size
C.	Multiple forms of enzyme
D.	Both A and B
Answer» D. Both A and B

Discussion

22.	In the case of allosteric enzymes what is the graphical representation when initial velocity is plotted against substrate concentration?
A.	Straight line with negative slope
B.	Hyperbola
C.	Sigmoid curve
D.	Parabola
Answer» D. Parabola

Discussion

23.	How many types of effectors are present?
A.	2
B.	3
C.	1
D.	4
Answer» B. 3

Discussion

24.	Allosteric enzymes forms which shape of curve?
A.	Hyperbolic
B.	Bell-shaped
C.	Sigmoid shaped
D.	Linear
Answer» D. Linear

Discussion

25.	Activity of allosteric enzymes are influenced by
A.	Allosteric modulators
B.	Allosteric site
C.	Catalytic site
D.	None of the above
Answer» B. Allosteric site

Discussion

26.	Which enzymes do not require co-enzymes for their activity ?
A.	The extracellular enzymes
B.	The intracellular Enzymes
C.	The mitochondrial enzymes
D.	The Proenzymes
Answer» B. The intracellular Enzymes

Discussion

27.	What are ribozymes ?
A.	RNA acting as enzymes
B.	Protein acting as enzymes
C.	Ribose sugar acting as enzymes
D.	Antibodies acting as enzymes
Answer» B. Protein acting as enzymes

Discussion

28.	Which of the following is not a co-enzyme
A.	NAD
B.	NADP
C.	FAD
D.	Mn++
Answer» E.

Discussion

29.	Abzymes are
A.	Proteins
B.	DNAs
C.	RNAs
D.	Antibodies
Answer» E.

Discussion

30.	Number of iron atoms in one haemoglobin molecule are
A.	1
B.	3
C.	4
D.	8
Answer» D. 8

Discussion

31.	Example of a Pro-enzyme
A.	Pepsinogen
B.	Trypsin
C.	Chymotrypsin
D.	Lysine
Answer» B. Trypsin

Discussion

32.	Most abundant blood cells in the human body are
A.	WBCs
B.	RBCs
C.	Platelets
D.	Plasma Cells
Answer» C. Platelets

Discussion

33.	Bile salt ________________surface tension
A.	Increases
B.	Decreases
C.	Both a and b
D.	None of the above
Answer» C. Both a and b

Discussion

34.	Which of the following organelle is called Suicidal Bag
A.	Mitochondria
B.	Endoplasmic reticulum
C.	Lysosome
D.	Ribosome
Answer» D. Ribosome

Discussion

35.	The allosteric inhibitor of an enzyme ___________
A.	Causes the enzyme to work faster
B.	Binds to the active site
C.	Participates in feedback regulation
D.	Denatures the enzyme
Answer» D. Denatures the enzyme

Discussion

36.	Lock and Key model is also known as
A.	Template model
B.	Induced fit model
C.	Khosland s Model
D.	Enzyme-substrate interaction model
Answer» B. Induced fit model

Discussion

37.	Apoenzymes dissociates from co-enzymes due to
A.	Change in pH
B.	Change in temperature
C.	Change in substrate concentration
D.	Change in inhibitor concentration
Answer» B. Change in temperature

Discussion

38.	Which of the following enzyme inhibitions shows decreased Km Value ?
A.	Competitive inhibition
B.	Un-competitive inhibition
C.	Non-competitive inhibition
D.	Feed back inhibition
Answer» B. Un-competitive inhibition

Discussion

39.	Uncatalyzed reaction shows ______________ activation energy
A.	Lower
B.	Higher
C.	Moderate
D.	Optimum
Answer» C. Moderate

Discussion

40.	Ping Pong reaction is the other name for
A.	Single-substrate reaction
B.	Single-displacement bi-substrate reaction
C.	Double-displacement bi-substrate reaction
D.	Lysine
Answer» D. Lysine

Discussion

41.	Enzyme acts best at a particular temperature called
A.	Catalytic Temperature
B.	At normal Body temperature
C.	Optimum temperature
D.	None of the above
Answer» D. None of the above

Discussion

42.	In competitive inhibition, inhibitors bears a close structural similarity with the
A.	Co-enzyme
B.	Co-factor
C.	Prosthetic group
D.	Substrate
Answer» E.

Discussion

43.	Feed back inhibition means -
A.	Initial product inhibition
B.	End Product inhibition
C.	Enzymatic induction
D.	None of the above
Answer» C. Enzymatic induction

Discussion

44.	Iron content of haemoglobin is
A.	0.33%
B.	1%
C.	3%
D.	9%
Answer» B. 1%

Discussion

45.	Holoenzyme is made of
A.	Apoenzyme and Zymogen
B.	Apoenzyme and Co-enzyme
C.	Co-enzyme and Prosthetic group
D.	Prosthetic group and Co-factor
Answer» C. Co-enzyme and Prosthetic group

Discussion

46.	The allosteric enzymes on the top of active sites contain
A.	substrate
B.	inhibitors
C.	polypeptide chains
D.	allosteric site
Answer» E.

Discussion

47.	The fastest enzyme is
A.	carbonic anhydrase
B.	pepsin
C.	DNA polymerase
D.	DNA gyrase
Answer» B. pepsin

Discussion

48.	What are the non-substrate molecules binding to the allosteric sites called?
A.	allosteric substrate
B.	reactants
C.	allosteric modulators
D.	inhibitors
Answer» D. inhibitors

Discussion

49.	The control and regulation of biological processes involve some enzymes. They are known as
A.	inhibitors
B.	regulators
C.	allosteric enzymes
D.	activators
Answer» D. activators

Discussion

50.	Enzymes regulated by which method works only once in the process or works under specific physiological conditions?
A.	Induction and repression
B.	Covalent modification
C.	Isoenzyme
D.	Non-covalent regulation of enzyme
Answer» B. Covalent modification

Discussion

Explore topic-wise MCQs in Enzymes Regulation.

Normal range of MCHC is

MCHC is

Average RBC count in an adult male is

Average volume of an RBC is _________ m 3;

Average mean corpuscular diameter is ____________ m

In sickle cell anaemia the defect lies in which polypeptide chain -

Which of the following is false about feedback regulation?

Which of the following enzyme catalyzes a reaction that introduces reduced nitrogen ito cellular metabolism?

Which of the following takes place due to phosphorylation of isocitrate dehydrogenase?

The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ___________

Which of the following enzymes catalyze the ADP-ribosylation of key cellular enzymes or proteins?

Removal of phosphoryl groups is catalyzed by ___________

Which type of attachment between the molecule and the enzyme changes the enzymatic activity?

Which of the following enzyme is responsible for the regulation of biological nitrogen fixation?

Which enzymes are termed as allosteric enzymes?

Which of the following is false about allosteric feedback inhibition?

Why are regulatory enzymes needed?

How many types of enzymatic regulation mechanism occurs in the cells?

Which is the enzyme that acts as a regulatory enzyme in a four-step metabolic pathway?

What are regulatory enzymes?

What are isoenzymes?

In the case of allosteric enzymes what is the graphical representation when initial velocity is plotted against substrate concentration?

How many types of effectors are present?

Allosteric enzymes forms which shape of curve?

Activity of allosteric enzymes are influenced by

Which enzymes do not require co-enzymes for their activity ?

What are ribozymes ?

Which of the following is not a co-enzyme

Abzymes are

Number of iron atoms in one haemoglobin molecule are

Example of a Pro-enzyme

Most abundant blood cells in the human body are

Bile salt ________________surface tension

Which of the following organelle is called Suicidal Bag

The allosteric inhibitor of an enzyme ___________

Lock and Key model is also known as

Apoenzymes dissociates from co-enzymes due to

Which of the following enzyme inhibitions shows decreased Km Value ?

Uncatalyzed reaction shows ______________ activation energy

Ping Pong reaction is the other name for

Enzyme acts best at a particular temperature called

In competitive inhibition, inhibitors bears a close structural similarity with the

Feed back inhibition means -

Iron content of haemoglobin is

Holoenzyme is made of

The allosteric enzymes on the top of active sites contain

The fastest enzyme is

What are the non-substrate molecules binding to the allosteric sites called?

The control and regulation of biological processes involve some enzymes. They are known as

Enzymes regulated by which method works only once in the process or works under specific physiological conditions?