Question

Unwinding of DNA strands is done by which enzyme?
a) Amylase
b) Endonuclease
c) Transcriptase
d) Helicase

Answer 1

Answer:

d) Helicase

Explanation:

The unwinding of DNA strands is done by the Helicase enzyme. This enzyme breaks the hydrogen bonds present between the complementary bases i.e. Adenine with thymine and guanine with cytosine, results unwinding of DNA double helix. It begins at the origin of replication with the separation of the double helix and converts into single strands and each strand allows them to be copied.

Answer 2

The correct answer is : d) DNA Helicase.

Explanation:

• The unwinding of the DNA supercoils is done by an enzyme called Topoisomerase.
• The double stranded DNA is unwound by the melting of the hydrogen bonds between the Purine (A/G) and pyrimidine(T/C) bases.
• This is done by the Helicase enzyme.
• A refers to adenine nucleotide.
• G refers to Guanine Nucleotide.
• T refers to Thymine Nucleotide.
• C refers to Cytosine Nucleotide.
• Helicase melts or breaks the two hydrogen bonds between A and T and the three hydrogen bonds between G and C.
• The separation of the DNA strands is necessary for DNA polymerase to carry out the process of Replication.