MCQOPTIONS

Explore topic-wise MCQs in Biomolecules : Constituents of Life.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Biomolecules : Constituents of Life knowledge and support exam preparation. Choose a topic below to get started.

1.	Match the chemicals in Group I with the possible type/class in Group II Group I Group II P. Picloram 1. Vitamin Q. Zeatin 2. Auxin R. Thiamine 3. Amino Acid S. Glutamine 4. Cytokinin
A.	P-2, Q-4, R-1, S-3
B.	P-4, Q-1, R-2, S-3
C.	P-3, Q-1, R-2, S-4
D.	P-4, Q-2, R-1, S-3
Answer» B. P-4, Q-1, R-2, S-3

2.	Match the reagents in Group I with their preferred cleavage sites in Group II. Group I P. Cyanogen bromide Q. o-IodosobenzoateR. Hydroxylamine S. 2-Nitro-5-thiocyanobenzoate Group II 1. Carboxyl side of methionine 2. Amino side of methionine 3. Carboxyl side of tryptophan 4. Amino side of cysteine 5. Asparagine-glycine bonds
A.	P-1, Q-3, R-5, S-4
B.	P-2, Q-3, R-1, S-4
C.	P-1, Q-2, R-5, S-4
D.	P-4, Q-2, R-5, S-3
Answer» B. P-2, Q-3, R-1, S-4

3.	How many different protein sequences of 100 residues can be generated using 20 standard amino acids ?
A.	100
B.	100 20
C.	20
D.	100! 20!
Answer» D. 100! 20!

4.	The number of amino acid residues present in the protein is
A.	15
B.	18
C.	17
D.	20
Answer» E.

5.	Disaccharide molecules that contain (1 4) glycosidic linkage are
A.	sucrose and maltose
B.	sucrose and isomaltose
C.	maltose and isomaltose
D.	lactose and cellobiose
Answer» E.

6.	Match the reagents in Group I with their preferred cleavage sites in Group II.
A.	P-1, Q-3, R-5, S-4
B.	P-2, Q-3, R-1, S-4
C.	P-1, Q-2, R-5, S-4
D.	P-4, Q-2, R-5, S-3
Answer» B. P-2, Q-3, R-1, S-4

7.	Which one of the following amino acids has the highest probability to be found on the surface of a typical globular protein in aqueous environment?
A.	Ala
B.	Val
C.	Arg
D.	Ile
Answer» D. Ile

8.	Levinthal's paradox is related to
A.	protein secretion
B.	protein degradation
C.	protein folding
D.	protein trafficking
Answer» D. protein trafficking

9.	Which one of the following aminoacids in proteins does NOT undergo phosphorylation?
A.	Ser
B.	Thr
C.	Pro
D.	Tyr
Answer» D. Tyr

10.	Which of the following statements with respect to the orientation of the nitrogenous bases to the pentose sugars, and the puckering of the sugar, is correct?
A.	Anti, and 2 -endo in A form DNA
B.	Anti, and 2 -endo in B form DNA
C.	Syn, and 3 -endo in A form DNA
D.	Syn, and 3 -endo in B form DNA
Answer» C. Syn, and 3 -endo in A form DNA

11.	If a plant is shifted to cold temperature, which of the following changes would take place in its membrane?
A.	Ratio of unsaturated to saturated fatty acids would increase
B.	Ratio of unsaturated to saturated fatty acids would decrease
C.	Absolute amount of both fatty acids would increase keeping the ratio same
D.	Absolute amount of both fatty acids would remain unchanged
Answer» B. Ratio of unsaturated to saturated fatty acids would decrease

12.	Amino acid residue which is most likely to be found in the interior of water-soluble globular proteins is
A.	Threonine
B.	Aspartic acid
C.	Valine
D.	Histidine
Answer» D. Histidine

13.	The 4-amino or 4-keto group of pyrimidine bases is located in the
A.	major groove of the double stranded DNA
B.	minor groove of the double stranded DNA
C.	minor groove of the B form DNA but not the A form DNA
D.	major groove of the B form DNA but not the A form DNA
Answer» B. minor groove of the double stranded DNA

14.	The number of h-helical turns permeating the membrane is
A.	5.6 turns
B.	3.5 turns
C.	6.5 turns
D.	5.0 turns
Answer» B. 3.5 turns

15.	Match the chemicals in Group I with the possible type/class in Group II
A.	P-2, Q-4, R-1, S-3
B.	P-4, Q-1, R-2, S-3
C.	P-3, Q-1, R-2, S-4
D.	P-4, Q-2, R-1, S-3
Answer» B. P-4, Q-1, R-2, S-3

16.	The protein in eukaryotes which is subjected to degradation undergoes
A.	phosphorylation
B.	carboxylation
C.	ubiquitation
D.	methylation
Answer» D. methylation