Q. During DNA replication, which strand is synthesized continuously?
-
A.
Lagging strand
-
B.
Leading strand
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C.
Okazaki strand
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D.
Template strand
Solution
The leading strand is synthesized continuously in the direction of the replication fork.
Correct Answer:
B
— Leading strand
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Q. What is the basic unit of DNA?
-
A.
Nucleotide
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B.
Amino acid
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C.
Monosaccharide
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D.
Fatty acid
Solution
DNA is composed of nucleotides, which are the basic building blocks.
Correct Answer:
A
— Nucleotide
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Q. What is the direction of DNA strand synthesis during replication?
-
A.
5' to 3'
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B.
3' to 5'
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C.
Both directions
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D.
Random direction
Solution
DNA strands are synthesized in the 5' to 3' direction.
Correct Answer:
A
— 5' to 3'
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Q. What is the function of primase in DNA replication?
-
A.
Unwinds DNA
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B.
Synthesizes RNA primers
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C.
Adds nucleotides
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D.
Seals gaps
Solution
Primase synthesizes short RNA primers needed for DNA polymerase to start replication.
Correct Answer:
B
— Synthesizes RNA primers
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Q. What is the role of DNA ligase in DNA replication?
-
A.
Unwinds DNA
-
B.
Synthesizes RNA primers
-
C.
Joins Okazaki fragments
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D.
Adds nucleotides
Solution
DNA ligase joins Okazaki fragments on the lagging strand during DNA replication.
Correct Answer:
C
— Joins Okazaki fragments
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Q. Which base pairs with adenine in DNA?
-
A.
Thymine
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B.
Cytosine
-
C.
Guanine
-
D.
Uracil
Solution
In DNA, adenine pairs with thymine through hydrogen bonds.
Correct Answer:
A
— Thymine
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Q. Which process ensures the accuracy of DNA replication?
-
A.
Transcription
-
B.
Proofreading
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C.
Translation
-
D.
Splicing
Solution
Proofreading by DNA polymerase ensures the accuracy of DNA replication by correcting errors.
Correct Answer:
B
— Proofreading
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