The enzyme that adds nucleotides to the growing DNA strand during replication is: MCQ with Answer and Explanation

The enzyme that adds nucleotides to the growing DNA strand during replication is:
A. Ligase
B. Helicase
C. Primase
D. DNA polymerase
Answer: Option D
Solution (By JKExamLibrary)
DNA polymerase catalyzes the formation of phosphodiester bonds between adjacent nucleotides, extending the new strand complementary to the template. Helicase unwinds DNA, ligase joins fragments, primase synthesizes RNA primer. In prokaryotes, DNA polymerase III is the main replicative enzyme.

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Practice More Biology Questions

Question #1
The enzyme that cuts DNA at specific sequences is:
A. Polymerase
B. Restriction endonuclease
C. Helicase
D. Ligase

Correct Answer: Option B


Explanation:
Restriction enzymes recognize specific palindromic sequences and cleave the DNA backbone, producing sticky or blunt ends for cloning.

This question belongs to: Science Biology
Question #2
The silkworm used in sericulture is the larva of:
A. Labeo rohita
B. Apis mellifera
C. Drosophila melanogaster
D. Bombyx mori

Correct Answer: Option D


Explanation:
Bombyx mori is the domesticated silkworm, whose caterpillar spins a silk cocoon. The silk thread is obtained by boiling cocoons. Apis mellifera is the honeybee, Labeo rohita is a fish (rohu), Drosophila is fruit fly used in genetics. Sericulture involves mulberry cultivation, silkworm rearing, and reeling of silk. India is the second largest silk producer.

This question belongs to: Science Biology
Question #3
The disease caused by the protozoan Trypanosoma cruzi is:
A. Leishmaniasis
B. Chagas disease
C. Malaria
D. Sleeping sickness

Correct Answer: Option B


Explanation:
Chagas disease is caused by T. cruzi, transmitted by triatomine bugs. Sleeping sickness is T. brucei, malaria Plasmodium, leishmaniasis Leishmania.

This question belongs to: Science Biology