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DNA Structure and Replication

DNA Structure and Replication
In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called

purines
pyrimidines
protamines
All of these

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DNA Structure and Replication
What is the approximate percentage of repetitive DNA sequences in human DNA?

20 to 30%
30 to 40%
10 to 20%
40 to 50%

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DNA Structure and Replication
Number of times the two DNA strands are interwined in circular DNA and is known as

linking number
none of these
helix frequency
twisting number

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DNA Structure and Replication
Proteins which help to open the double helix for DNA synthesis are

ligase
DNA topoisomerase
DNA helicases
single stranded binding proteins

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DNA Structure and Replication
Who's X-ray work aided Watson and Crick in their discovery of the double helix?

L. Pauling
R. Franklin
W.H. Bragg
Leaderberg

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DNA Structure and Replication
What is the exact name of the classical Watson-Crick double helix DNA?

B-DNA
Z-DNA
X-DNA
A-DNA

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