MBC NANDED

Subject : Biology Paper Set : 1

Standard : 11 Biomolecule Date : 11-08-2024
Total Mark : 180 Time : 0H:45M

(12) Most enzymes consist of two parts; these are

............. Biology - Section A (MCQ) .............
(A) Enzyme and substrate
(1) Simplest form of carbohydrate is (B) Enzyme and coenzyme
(A) Carbon (B) Starch (C) Apoenzyme and enzyme
(C) Monosaccharide (D) Canesugar (D) Apoenzyme and prosthetic group
(2) Which of the following is polymerized to form proteins
(13) N ADP is
(A) Protein (B) Carbohydrates
(A) A coenzyme (B) A part of tRN A
(C) Amino acid (D) Muramic acid
(C) An enzyme (D) A part of rRN A

S
(3) Cellulose is a
(14) Identify the correct statement regarding enzymes

AS
(A) Monosaccharide (B) Disaccharide
(A) Enzymes are specific biological catalysts that can
(C) Homoglycan pentosan (D) Homoglycan hexosan normally function at very high temperatures ( T 1000 K)

CL
(4) DN A differs from RN A (B) Enzymes are normally heterogeneous catalysts that are
(A) In the nature of sugar alone very specific in their action
(B) In the nature of purines alone
GY (C) Enzymes are specific biological catalysts that cannot be
poisoned
(C) In the nature of sugar and pyrimidines
LO
(D) Enzymes are specific biological catalysts that possess
(D) None of the above
well defined active sites
(5) Which of the following is a purine
O

(15) Which statement about protein is wrong?

(A) Prokaryotes (B) Guanine
(A) Proteins occur in all living cells
BI

(C) Thymine (D) Uracil

(B) Proteins invariably contain N, 0, C and H
(6) In DN A guanine pairs with
LE

(C) Proteins are synthesized by plant kingdom only

(A) Cytosine (B) Thymine
(D) Proteins are also synthesized in laboratory
NA

(C) Uracil (D) Adenine

(7) The base pairs of DN A are correctly shown as (16) Which of the following is not strictly a biomacromolecule?
(A) A ≡ T and C = G (B) A = T and C = G (A) Proteins (B) Lipids
G

(C) A = T and C ≡ G (D) A ≡ T and C ≡ G (C) Polysaccharides (D) Nucleic acid

AN

(8) Purines are (17) A secondary metabolite that acts as a toxin is

(A) Single ring compounds (A) Carotenoids (B) Curcumin
M

(B) Double ring compounds (C) Abrin (D) Monoterpenes

(C) Straight chain compounds (18) A secondary metabolite that is alkaloid in nature is
(A) Codeine (B) Anthocyanin
(D) None of the above
(C) Gum (D) Abrin
(9) How many nucleotides are present in one turn of DN A helix
(19) Peptidoglycan present in bacterial cell envelope is
(A) 4 pairs (B) 8 pairs
(A) Made up of cellulose
(C) 10 pairs (D) 9 pairs
(B) A heteropolymer
(10) Nucleoside is made up of
(A) Sugar only (B) Phosphate only (C) An oligosaccharide

(C) Sugar and phosphate (D) Sugar and base (D) A homopolymer
(11) Enzymes are different from inorganic catalysts (20) In glycine the R group is replaced by
(A) Not being used up in reactions (A) A methyl group
(B) Being proteinaceous in nature (B) Hydroxy methyl
(C) Having high diffusion rate (C) A carboxylic group
(D) Working at high temperature (D) A hydrogen

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(21) The amino acids in a protein are held together by (34) Which of the following statements is incorrect w.r.t.
(A) Glycosidic bond (B) Phosphodiester bond inorganic catalysts?
(C) Peptide bond (D) Hydrogen bond (A) They do not occur in living cells

(22) An example of protein with quaternary structure is (B) They are not specific for any reaction
(A) Myoglobin (B) Haemoglobin (C) They get damaged at high temperature
(C) Keratin (D) All of these (D) They work efficiently at high pressure
(23) Lecithin is a
(35) Read the following : (a) Low temperature preserves the
(A) Type of wax (B) Phospholipid enzyme (b) Enzyme activity increases above optimum
(C) Oil (D) Simple fatty acid temperature (c) Enzyme gets denatured at high
temperature (d) Competitive inhibitor competes with the
(24) In B − DN A, one full turn of the helical strand contains
product formed
(A) 11 base pairs (B) 8 base pairs
(C) 10 base pairs (D) 9 base pairs Which of the following statement are true?
(A) (a) and (c) (B) (b) and (d)
(25) In B − DN A, the rise per base pair would be
(A) 4.3 (B) 2.4 (C) (c) and (d) (D) (a) and (b)

(C) 3.4 (D) 4.2

(26) The nitrogenous bases of the two strands of DN A are ..... Biology - Section B (MCQ) (Attempt any 10) .....
joined by

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(A) Phosphodiester bond (B) Hydrogen bond

AS
(36) Enzymes catalysing the breakdown of larger molecules into
(C) Glycosidic bond (D) Peptide bond smaller molecules are
(A) Hydrolases (B) Isomerases

CL
(27) Ribozymes are _______ that behave like enzymes.
(A) Proteins (B) Ribonucleic acids (C) Ligase (D) Both (a) and (c)

(C) Oligosaccharide (D) Simple lipids

(28) Non-protein part of enzyme is known as
GY
(37) Michaelis constant (Km) value of enzyme is substrate
concentration at which velocity of reaction is
(A) Apoenzyme (B) Cofactor (A) Vmax (B) One third Vmax
LO

(C) Inorganic catalyst (D) Active site (C) Half Vmax (D) One f if th Vmax

(38) Study the following statements : (a) The substrate binds to

O

(29) Chitin present in the exoskeletons of arthropods is

(A) Protein (B) Polysaccharide the active site of the enzyme (b) Enzymes isolated from
BI

thermophilic organisms get denatured at 50°C (c) The active

(C) Lipid (D) Derived monosaccharide site of enzyme breaks the chemical bonds of the product (d)
LE

(30) The given amino acid is _______ in nature. Prosthetic groups are tightly bound to the apoenzyme
Select the option which includes all correct statements :
NA

(A) (a) and (c) (B) (c) and (d)

(C) (b) and (c) (D) (a) and (d)
(A) Acidic (B) Basic
G

(39) One of the following is correct sequence of carbohydrates in

(C) Neutral (D) Aromatic the order of increasing complexity of chemical structure
AN

(31) The product of the given reaction would be a (A) Sucrose, starch, oligosaccharide, maltose, triose
(B) Triose, maltose, sucrose, oligosaccharide, starch
M

(C) Triose, glucose, maltose, oligosaccharide, starch

(D) Oligosaccharide, triose, starch, sucrose, maltose
(A) Monoglyceride (B) Diglyceride
(40) Lysine is an essential amino acid because
(C) Triglyceride (D) Both (a) and (c)
(A) It is very rare
(32) If the sequence of bases in one of the DN A strand is
A G G A G A A, then the sequence of bases in the other (B) It has a high nutritive value
complementary strand of DN A would be (C) It is an important constituent of all proteins
(A) C C T T C T T (B) T C T C T C C
(D) It is not formed in the body and has to be provided
(C) T C C T C T T (D) C C T C T C T through diet
(33) Which of the following statements is correct?
(41) Electron transferring enzymes belong to
(A) Biocatalysts accelerate the rate of a given metabolic (A) Transferases (B) Oxidoreductases
reaction
(C) Lyases (D) Isomerases
(B) Biocatalysts are generally protein
(42) A : Cofactor of an enzyme may be a prosthetic group.
(C) Enzyme catalyst differ from inorganic catalyst
(D) All of these R : N AD derived from niacin is a co-enzyme.

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 (A) Assertion and Reason both are correct and also correct Choose the correct answer from the options given below.
explanation. (A) A − I, B − II, C − III, D − IV
(B) Assertion and Reason both are correct but not (B) A − II, B − III, C − IV, D − I
explanation of assertion.
(C) A − III, B − IV, C − I, D − II
(C) Assertion is correct, but Reason is incorrect.
(D) A − IV, B − I, C − II, D − III
(D) Both Assertion and Reason are incorrect.
(49) Match List I with List II :
(43) A : Tertiary structure of protein molecules makes them
biologically active. List I List II

R : It is native configuration of protein molecules A. Lipase I. Peptide bond

maintained by multiple covalent bonds only. B. Nuclease II. Ester bond
(A) Assertion and Reason both are correct and also correct C. Protease III. Glycosidic bond
explanation.
D. Amylase IV. Phosphodiester
(B) Assertion and Reason both are correct but not bond
explanation of assertion.
Choose the correct answer from the options given below :
(C) Assertion is correct, but Reason is incorrect.
(A) A − III, B − II, C − I, D − IV
(D) Both Assertion and Reason are incorrect.
(B) A − II, B − IV, C − I, D − III
(44) A : Non-competitive inhibitors have no effect on Vmax .
(C) A − IV, B − I, C − III, D − II

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R : In non-competitive inhibition, inhibitor and substrate

AS
bind at same sites on the enzyme. (D) A − IV, B − II, C − III, D − I
(A) Assertion and Reason both are correct and also correct (50) Regarding catalytic cycle of an enzyme action, select the

CL
explanation. correct sequential steps :
(B) Assertion and Reason both are correct but not A. Substrate enzyme complex formation.
explanation of assertion. GY B Free enzyme ready to bind with another substrate.
(C) Assertion is correct, but Reason is incorrect. C. Release of products.
D. Chemical bonds of the substrate broken.
LO
(D) Both Assertion and Reason are incorrect.
(45) A : Tertiary structure of protein is absolutely necessary for E. Substrate binding to active site.
many biological activities of proteins. Choose the correct answer from the options given below :
O

R : In protein, only right handed helices are observed. (A) A, E, B, D, C (B) B, A, C, D, E

BI

(A) Assertion and Reason both are correct and also correct (C) E, D, C, B, A (D) E, A, D, C, B
explanation.
LE

(B) Assertion and Reason both are correct but not

explanation of assertion.
NA

(C) Assertion is correct, but Reason is incorrect.

G

(D) Both Assertion and Reason are incorrect.

(46) Lecithin, a small molecular weight organic compound found
AN

in living tissues, is an example of:

(A) Phospholipids (B) Glycerides
M

(C) Carbohydrates (D) Amino acids

(47) Inhibition of Succinic dehydrogenase enzyme by malonate is
a classical example of.
(A) Feedback inhibition
(B) Competitive inhibition
(C) Enzyme activation
(D) Cofactor inhibition
(48) Match List-I with List-II
List-I List-II
A. GLUT-4 1. Hormone
B. Insulin II. Enzyme
C. Trypsin III. Intercellular
ground substance
D. Collagen IV Enables glucose
transport into cells

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 MBC NANDED
Subject : Biology Paper Set : 1
Biomolecule Date : 11-08-2024
Standard : 11
Total Mark : 180 (Answer Key) Time : 0H:45M

Biology - Section A (MCQ)

1-C 2-C 3-D 4-C 5-B 6-A 7-C 8-B 9-C 10 - D

11 - B 12 - D 13 - A 14 - D 15 - C 16 - B 17 - C 18 - A 19 - B 20 - D
21 - C 22 - B 23 - B 24 - C 25 - C 26 - B 27 - B 28 - B 29 - B 30 - A
31 - C 32 - C 33 - D 34 - C 35 - A

Biology - Section B (MCQ)

S
AS
36 - A 37 - C 38 - D 39 - C 40 - D 41 - B 42 - B 43 - C 44 - D 45 - B

CL
46 - A 47 - B 48 - D 49 - B 50 - D

GY
O LO
BI
LE
G NA
AN
M