NEET TEST SERIES 106 BIOLOGY

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1. The double-helical structure of DNA was proposed by:

(a) Watson and Crick
(c) Frederick Sanger
(d) Rosalind Franklin
(b) Linus PaulingDeselect Answer

a)

b)

c)

d)

None

2. Assertion: Enzymes are highly specific in their action.
Reason: Enzymes have an active site that binds to a specific substrate.

a) Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.
b) Both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
c) Assertion is true, but the Reason is false.
d) Both Assertion and Reason are false.

Deselect Answer

a)

b)

c)

d)

None

3. Assertion: RNA is more reactive than DNA.
Reason: RNA contains uracil instead of thymine.

a) Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.
b) Both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
c) Assertion is true, but the Reason is false.
d) Both Assertion and Reason are false.Deselect Answer

a)

b)

c)

d)

None

4. Which of the following is a fibrous protein?

(a) Hemoglobin
(b) Keratin
(c) Insulin
(d) MyoglobinDeselect Answer

a)

b)

c)

d)

None

5. Which of the following is a storage polysaccharide in animals?

(a) Cellulose
(b) Starch
(c) Glycogen
(d) ChitinDeselect Answer

a)

b)

c)

d)

None

6. In a typical angiosperm, the mature embryo sac is 7-celled and 8-nucleate. If the polar nuclei fail to fuse before fertilization, what would be the ploidy level of the endosperm in the resulting fertilization?

(a) Haploid (n)

(b) Diploid (2n)

(c) Triploid (3n)

(d) Tetraploid (4n)

Deselect Answer

a)

b)

c)

d)

None

7. A plant exhibits cleistogamy and produces only self-pollinated seeds. Which of the following features is most likely absent in such a plant?

(a) Nectar production
(b) Micropyle plant?
(c) Synergids
(d) Endosperm

Deselect Answer

a)

b)

c)

d)

None

8. During pollen grain development, the generative cell divides to form two male gametes. If a mutation causes the generative cell to divide into three cells instead of two, what would be the most likely consequence during fertilization?

a) Formation of twin embryos
b) Failure of double fertilization
c) Production of a tetraploid endosperm
d) No effect on seed development

Deselect Answer

a)

b)

c)

d)

None

9. In some angiosperms, apomixis mimics sexual reproduction. Which of the following best explains why apomictic seeds are genetically identical to the parent plant?

a) Meiosis is followed by fusion of gametes
b) Embryo develops from a diploid cell without fertilization
c) Endosperm formation involves triple, fusion
d) Pollen grains undergo mitotic division

Deselect Answer

a)

b)

c)

d)

None

10. A flower is pollinated by wind, and its pollen grains lack exine. Which of the following adaptations is most likely present to ensure successful pollination?

a) Sticky pollen grains
b) Feathery stigma
c) Brightly colored petals
d) Nectar guides

Deselect Answer

a)

b)

c)

d)

None

11. In an experiment, the stigma of a flower is removed before pollination. Which of the following processes will be directly affected?

a) Formation of the pollen tube
b) Fusion of male gamete with egg cell
c) Development of the endosperm
d) Maturation of the ovule

Deselect Answer

a)

b)

c)

d)

None

12. The phenomenon of polyembryony is observed in certain plants. Which of the following is a correct statement regarding polyembryony?

a) It always results from the fertilization of multiple egg cells
b) It can occur due to the cleavage of a single zygote or development of additional embryos from nucellar cells
c) It leads to the formation of genetically diverse embryos in a single seed
d) It is exclusive to plants exhibiting apomixis

Deselect Answer

a)

b)

c)

d)

None

13. In a species of flowering plant, the pollen grains are viable for only 30 minutes after release. What type of pollination mechanism is this plant most likely adapted to?

a) Entomophily (insect pollination)
b) Anemophily (wind pollination)
c) Hydrophily (water pollination)
d) Autogamy (self-pollination)

Deselect Answer

a)

b)

c)

d)

None

14. Which of the following structures in an angiosperm ovule directly provides nourishment to the developing embryo?

a) Integuments
b) Endosperm
c) Nucellus
d) Funicle

Deselect Answer

a)

b)

c)

d)

None

15. A plant breeder observes that a certain variety of angiosperm produces seeds without fertilization of the egg cell but requires pollination for endosperm development. This phenomenon is best described as:

(a) Parthenocarpy
(b) Apomixis
(c) Pseudogamy
(d) Polyembryony

Deselect Answer

a)

b)

c)

d)

None

16. The primary structure of a protein is stabilized by:

(a) Hydrogen bonds
(b) Peptide bonds
(c) Disulfide bridges
(d) Ionic bonds

Deselect Answer

a)

b)

c)

d)

None

17. A certain biomolecule exhibits the following properties:

It is insoluble in water.
It contains long hydrocarbon chains.
It yields glycerol and fatty acids upon hydrolysis.

What is the biomolecule?

(a) Carbohydrate
(b) Protein
(c) Lipid
(d) Nucleic acid

Deselect Answer

a)

b)

c)

d)

None

18. In the competitive inhibition of an enzyme, the inhibitor:

a) Binds irreversibly to the active site
b) Increases the Km value without affecting Vmax
c) Decreases both Km and Vmax
d) Binds to the allosteric site of the enzyme

Deselect Answer

a)

b)

c)

d)

None

19. The denaturation of a protein involves:

a) Breaking of peptide bonds
b) Loss of primary structure
c) Disruption of secondary and tertiary structures
d) Formation of new hydrogen bonds

Deselect Answer

a)

b)

c)

d)

None

20. An amino acid with a hydrophobic side chain is most likely to be found:

a) On the surface of a globular protein
b) In the interior of a globular protein
c) In the active site of an enzyme
d) In the peptide backbone

Deselect Answer

a)

b)

c)

d)

None

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