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Poll
ZOOLOGY (Z-11)
Syllabus: Biomolecules-l|
Choose the correct answer.
4. Assuming a hypothetical scenario, in aparticular
1. Consider the tetrapeptide given below. dsDNA, 45% of bases were shown to be thymine.
The percentage of adenine, guanine and cytosine
H:H are expected to be
H: H
-N -C-KC -NC- -Ni- -c- N - au0 (1) A-5% G- 45% C- 45%
CH, (2) A - 45% G- 5% C-5%
CH,OH
IV (3) A 5% G-- 45% C-5%
Choose the incorrect statement. (4) A - 15% G- 20% C- 20%
(1) The amino acid Iis the N-terminal amino acid.
5.An enzyme X' catalyses by cleavage of substrate
(2) There are three peptide bonds in the given into two parts without the use of water moiety and
structure. adouble bond is formed at the place of removal of
(3) The serine is the amino terminal residue. groups whereas enzyme Y catalyses the
(4) The alanine is the C-terminal residue. conversion of hydrogen peroxide into water and
Oxygen. The enzyme commission number of Yis
2 All of the following reactions are catalysed by
1.11,1.6. Select the option that correctly identifies
different enzymes belonging to the class-!ll of the class of X' and Y"
enzymes, except
(1) Breakdown of nucleotides into nucleosides 'X Y
and phosphoric acid (1) Dehydrogenases Lyases
(2) Breakdown of H202 into water and oxygen
(2) Lyases Transferases
(3) Breakdown of peptides into amino acids
(4) Digestion of sucrose into glucose and fructose (3) Oxidoreductases Lyases
3 Match column I with column I| and select the (4) Lyases Dehydrogenases
correct option w.r.t. B-DNA.
6 Select the incorrect statement w.r.t. cata lysed
Columnl Column l| metabolic conversions.
a. At each step, the DNA (0) 3.4 A (1) There could be many more 'altered structural
strand turns states' between the stable substrate and the
b Pitch of the DNA
product.
(i) 369
Rise per base pair 3.4 nm
(2) Stability is something related to energy status
C. (ii) of the molecule or the structure.
(1) (a)-(i). (b)-(i). (c)-{i) (3) If product is at lower energy level than
(2) (a)-(). (b)-(i). (c-(ii) substrate, then the reaction is an energy
(3) (a)-(i), (b)-(ii). (c)-(ii) requiring process.
(4) (a-(ii), (b-(i). (C)-(i) (4) The 'ES' complex formation is a transient
phenomenon.
(Page 1]
Poll-11 Zoology
7. The given graph represents the effect of 12. Three of the following statements about co-factors
concentration of substrate on enzyme activity. are correct and one is wrong. Which one is wrong?
Select the labeling that represents the
concentration of substrate at which the velocity of (1) Non-protein constituents of holoenzymes are
reaction is half of the attained maximum velocity. called
Co-factors.
of
Velocity
reacion (2) Co-enzymes form coordination bonds with
side chains at the active site of the enzyme
(3) Co-enzymes are organic compounds and their
association with the apoenzyme is only
transient
B
(4) Catalytic activity is lost when the co-factor is
removed from the enzyme.
13. Consider the figure given below
[substrate) Bond Bond B
(1) A (2) B
(3) C (4) D
8 Adult human haemoglobin is made up of a protein
part and a non-protein part. The non-protein part
Compound in its free form acts as a prosthetic
group for the enzyme
(1) Peroxidase
(2) Carboxypeptidase
(3) Carbonic anhydrase Choose the incorrect statement.
(4) Alcohol dehydrogenase
9. Choose the incorrect statement (1) 'P'and 'Q'are adenine and thymine.
(1) In competitiveinhibition, the inhibitor (2) Bond 'A is also found in between the
monomers of a disaccharide.
competes with the substrate for substrate
binding site of the enzyme. (3) Bond 'B' is the result of dehydration.
(2) In competitive inhibition, substrate binds with (4) Bond present in between 'R' and 'S' is a bond
enzyme at its active site. which links monomers resulting in a dipeptide
(3) With increase in substrate concentration, the 14. The rate of a chemical reaction if the
velocity of an enzymatic reaction increases temperature of the sample is raised from 20°C to
first but ultimately reaches a maximum 40° C.
velocity. Select the correct option to fll in the blank.
(4) The enzymes get denatured at a temperature (1) Decreases three times
lower than that of their optimum temperature.
(2) Increases four times
10. All of the given enzymes are proteinaceous in
nature, except (3) Decreases by half
(1) Carboxylase (2) Ribozyme (4) Increases three times
(3) Catalase (4) Dehydrogenase 15. In a polypeptide, amino acids are inked by
11. Amolecule 'X' closely resembles the succinate in 'A' bonds, whereas in a polysaccharide, the
its structure. It is also responsible for inhibiting the individual monosaccharides are linked by
'B' bonds. Select the option that correctly
activity of the enzyme succinic dehydrogenase.
ldentify 'X' and select the correct option. identifies 'A' and 'B' respectively.
(1) Lactic acid (1) Sulphide, Peptide
(2) Malonate (2) Peptide, Glycosidic
(3) Catalase (3) Ester, Peptide
(4) Peroxidase (4) Glycosidic, Ester
(Page 2)
Zoology Poll-11
16. Given below are statements w.r.t. structures of 19. Observe the below given reaction.
proteins. Select the incorrect statement.
COz H20 HzCO3
(1) Physicists conjure up the two dimensional
views of molecular structures while biolbgists Carbon dioxide Water Carbonic acid
describe the protein structure at five levels. In the absence of enzyme, 200 molecules of
(2) Primary structure of protein is imagined as a HCO3 are forned in 1 hour in above given
line and the right end is represented by the last
amino acid. reaction. By using an enzyme Z the speed
(3) a-helix and B-pleated sheet are secondary increases dramatically with about 600,000
molecules being formed every seconds. Z
structural forms of proteins. accelerates the reaction rate by 'Y times. ldentify
(4) Only right handed helices are observed in 'Z and Yand select the correct option.
proteins.
17. A respiratory pigment present in RBCs of adutt (1) Z-Carbonic anhydrase, Y- 1milion times
humans represents structure of proteins. (2) Z-Catalase, Y - 10 milion times
Select the correct option to fill in the blank.
(1) Primary (2) Secondary (3) Z-Carbonic anhydrase, Y-0.01 billion times
(3) Tertiary (4) Quaternary (4) Z- Peroxidase., Y- 0.01 billion times
18. Read the statements (A) and (B) and select the 20. Inorganic catalysts differ from enzymes as
correct option.
Statement A: The conversion of glucose to lactic (1) Former one can function effectively at higher
acid in our skeletal muscles during exercise is an temperature
anabolic process. (2) Later one can function effectively at
Statement B: The activity of enzymes decline temperature higher than optimum temperature
below and above optimum pH.
(1) Both (A) and (B) are correct (3) Former one can function only at a particular
(2) Only (B) is correct. low temperature
(3) Only (A) is correct. CC (4) Former one get damaged at high temperature
(4) Both (A) and (B) are incorrect [Say above 40° C)
(Page 3]
