NCERT Biomolecules Objective Questions NEET,Biology solutions,pdfs

Biomolecules Mock Exam-4

Question No:1

Which of the following is correct about DNA?

[A] Double helical structure in which two strands of polynucleotide runs antiparallel
[B] Bank-bone is formed by Sugar-Phosphate-Sugar chain
[C] N2-bases projected more or less perpendicular to back bone and faces inside
[D] All

Question No:2

Which one is correct about DNA?

[A] DNA exist as double helix
[B] Two strands of polynucleotide in DNA are antiparallel
[C] The nitrogen bases are projected more or less perpendicular to this backbone but face inside
[D] All

Question No:3

At each step of ascent in a B-DNA double helical structure, the strand turn………..

[A] 36°
[B] 72°
[C] 90°
[D] 18°

Question No:4

One full turn of B-DNA helix strand would involve how many base pairs?

[A] 12
[B] 8
[C] 10
[D] 20

Question No:5

Select the incorrect statement from the following:

[A] N2-bases (A, G, C, T, U) have heterocyclic rings
[B] In most of organism DNA is genetic material
[C] Adenylic acid is nucleoside
[D] The rise per base pair in B-DNA is 3.4A°

Question No:6

There are ………. hydrogen bond between A and T, and ………. hydrogen bond between G and C.

[A] 2,2
[B] 3,3
[C] 2,3
[D] 3,2

Question No:7

Plants produce an enormous diversity of substances that have no apparent roles in growth and development processes and are classified under the heading of

[A] primary metabolites
[B] secondary metabolites
[C] necessary metabolites
[D] tertiary metabolites

Question No:8

Which one of the following is secondary metabolite?

[A] Amino acid
[B] Sugar
[C] Flavonoides and autibiotics
[D] Protein

Question No:9

Which one of the following statement is incorrect?

[A] Primary metabolites have indenfiable functions
[B] Some secondary metabolites have ecological importance
[C] Secondary metabolites like rubber, drugs, spices, scents and pigments are useful to human welfare
[D] Secondary metabolites are not found in fungi, microbes and plants

Question No:10

Following are pigments

[A] Morphine
[B] Vinblastin
[C] Carotenoids and anthocyanin
[D] Ricin

Question No:11

Which one of the following is not a polymeric substance?

[A] Rubber
[B] Morphine
[C] Protein
[D] Cellulose

Question No:12

Which of the following secondary metabolites are used as drugs?

[A] Abrin + Ricin
[B] Vinblastin + Curcumin
[C] Anthocyanins
[D] Monoterpenes

Question No:13

Which one of the following is a secondary metabolite?

[A] Lemon oil grass
[B] Sucrose
[C] Lactose
[D] Glycine

Question No:14

Match the Column
Column I– Column II
(Category) (Secondary Metabolites)
A. Pigments – 1) Concanavalin A
B. Terpenoides – 2) Monoterpenes, Diterpenes
C. Alkaloids — 3) Morphine, Codeine
D. Lectins – 4) Carotenoids, Anthocyanine
E. Toxins — 5) Abrin and Ricin
F. Drugs – 6) Vinblastin, Curcumin

[A] A-1, B-2, C-6, D-4, E-5, F-6
[B] A-4, B-2, C-3, D-1, E-5, F-6
[C] A-3,B-4,C-6,D-5,E-1,F-2
[D] A-2, B-1, C-4, D-6, E-5, F-6

Question No:15

Which one(s) is (are) secondary metabolites?

[A] Flavonoids and Rubber
[B] Antibiotics, coloured pigments and essential oils
[C] Scents, gums, spices
[D] All

Question No:16

Select the incorrect statement from the following:

[A] All biomolecules have turnover in cell
[B] Metabolic reaction does not occur in isolation
[C] Metabolic pathways are either linear or circular
[D] Metabolites flow is a steady state of body constituent

Question No:17

Select the incorrect statement from the following:

[A] Acetic acid becoming cholesterol is an example of biosynthetic or anabolic pathway
[B] Glucose becoming lactic acid in our skeletal muscles is an example of degradation or catabolic pathway
[C] Flow of metabolite through metabolic pathway does not have a definite rate and direction
[D] Anabolic pathway requires energy whereas catabolic pathway releases energy

Question No:18

Bond energy, which is stored in our body in the form of ATP, is utilized in

[A] biosynthetic phase
[B] osmotic work
[C] mechanical work
[D] all

Question No:19

Living state is

[A] non-equilibrium, non-steady state
[B] equilibrium, steady state
[C] non-equilibrium, steady state
[D] equilibrium, non-steady state

Question No:20

Select the correct statement from the following:
(A) Biomolecules are in metabolic flux in living state.
(B) Living process is a constant effort to prevent falling into equilibrium.
(C) Metabolism provides a mechanism for the production of energy.
(D) Living state and metabolism is synonymous.

[A] All except A
[B] All except B
[C] All except D
[D] All