CBSE Class 12 Chemistry Biomolecules MCQs Set 02

Question. Match the following Columns.

      A    B   C    D   E
(a) 3    4    5    2   1
(b) 3    4    5    1   2
(c) 4    5    1    3   2
(d) 3    5    4    2   2
(e) 4    5    3    1   2

Answer : C

Question. Match the following Columns.

      A    B   C   D
(a) 1    2    3    4
(b) 2    3    4    1
(c) 3    4    1    2
(d) 3    4    2    1

Answer : C

Question. The function of enzymes in the living system is to
(a) catalyse biochemical reactions
(b) provide energy
(c) transport oxygen
(d) provide immunity.

Answer : A

Question. Deficiency of vitamin B1 causes the disease
(a) convulsions
(b) beri-beri
(c) cheilosis
(d) sterility.

Answer : B

Question. The difference between amylose and amylopectin is
(a) amylopectin have 1 → 4 a-linkage and 1 → 6 a-linkage
(b) amylose have 1 → 4 a-linkage and 1 → 6 b-linkage
(c) amylopectin have 1 → 4 a-linkage and 1 → 6 b-linkage
(d) amylose is made up of glucose and galactose.

Answer : A

Question. Which one of the following bases is not present in DNA?
(a) Quinoline
(b) Adenine
(c) Cytosine
(d) Thymine

Answer : A

Question. In biological systems, the RNA molecules direct the synthesis of specific proteins which are characteristics of each kinds of organism. This process is known as
(a) transcription
(b) mutation
(c) replication
(d) translation
(e) flocculation

Answer : D

Question. Night-blindness may be caused by the deficiency of vitamin
(a) A
(b) B
(c) C
(d) D

Answer : A

Question. Sanger’s method is used to identify
(a) C-terminal amino acid
(b) N-terminal amino acid
(c) side chain
(d) molecular weight protein

Answer : D

Question. Helical structure of protein is stablilised by
(a) peptide bond
(b) hydrogen bond
(c) van der Waals’ force
(d) dipole association

Answer : B

Question. The hormone that helps in the conversion of glucose to glycogen is
(a) cortisone
(b) bile acids
(c) adrenaline
(d) insulin.

Answer : D

Question. The cell membranes are mainly composed of
(a) fats
(b) proteins
(c) phospholipids
(d) carbohydrates.

Answer : C

Question. In a protein molecule various amino acids are linked together by
(a) peptide bond
(b) dative bond
(c) a-glycosidic bond
(d) b-glycosidic bond.

Answer : A

Question. Which of the statements about 'Denaturation' given below are correct?
(1) Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(2) Denaturation leads to the conversion of double strand of DNA into single strand.
(3) Denaturation affects primary structure which gets distorted.
(a) (2) and (3)
(b) (1) and (3)
(c) (1) and (2)
(d) (1), (2) and (3)

Answer : C

Question. On hydrolysis of starch, we finally get
(a) glucose
(b) fructose
(c) both (a) and (b)
(d) sucrose.

Answer : A

Question. Enzymes take part in a reaction and
(a) decrease the rate of a chemical reaction
(b) increase the rate of a chemical reaction
(c) both (a) and (b)
(d) none of these.

Answer : B

Question. Cellulose is polymer of
(a) glucose
(b) fructose
(c) ribose
(d) sucrose.

Answer : A

Question. Which of the following gives positive Fehling solution test?
(a) Sucrose
(b) Glucose
(c) Fats
(d) Protein

Answer : B

Question. The pyrimidine bases present in DNA are
(a) cytosine and adenine
(b) cytosine and guanine
(c) cytosine and thymine
(d) cytosine and uracil

Answer : C

Question. There are 20 naturally occurring amino acids.The maximum number of tripeptides that can be obtained is
(a) 8000
(b) 6470
(c) 7465
(d) 5360

Answer : A

Question. The a-D-glucose and b-D-glucose differ from each other due to difference in carbon atom with respect to its
(a) number of OH groups
(b) size of hemiacetal ring
(c) conformation
(d) configuration.

Answer : D

Question. Chemically considering digestion is basically
(a) anabolism
(b) hydrogenation
(c) hydrolysis
(d) dehydrogenation.

Answer : C

Question. Which of the following is a basic amino acid?
(a) Serine
(b) Alanine
(c) Tyrosine
(d) Lysine

Answer : D

Question. The non-essential amino acid among the following is
(a) lysine
(b) valine
(c) leucine
(d) alanine.

Answer : D

Question. Which structure(s) of proteins remain(s) intact during denaturation process?
(a) Both secondary and tertiary structures
(b) Primary structure only
(c) Secondary structure only
(d) Tertiary structure only

Answer : B

Question. Which of the following is not present in a nucleotide?
(a) Cytosine
(b) Guanine
(c) Adenine
(d) Tyrosine

Answer : D

Question. Which of the following compounds can form a zwitter ion?
(a) Aniline
(b) Acetanilide
(c) Benzoic acid
(d) Glycine

Answer : D

Question. Which functional group participates in disulphide bond formation in proteins?
(a) Thioester
(b) Thioether
(c) Thiol
(d) Thiolactone

Answer : C

Question. In both DNA and RNA, heterocylic base and phosphate ester linkages are at
(a) C’₅ and C’₁  respectively of the sugar molecule
(b) C’₁  and C’₅  respectively of the sugar molecule
(c) C’₂  and C’₅  respectively of the sugar molecule
(d) C’₅  and C’₂  respectively of the sugar molecule 

Answer : A

Question. How many hydrogen bonds are present between pair of thymine and adenine in DNA ?
(a) 1-hydrogen bond
(b) 2-hydrogen bonds
(c) 3-hydrogen bonds
(d) No bonds occur

Answer : B