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DNA Structure and Replication

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

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

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DNA Structure and Replication
In DNA, guanine pairs with

Adenine
Thymine
Cytosine
Uracil

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DNA Structure and Replication
The size of a linear DNA fragment in a gel can be estimated by

fluorescence in UV light
the time it takes the gel to run
the sedimentation coefficient
comparison with a molecular weight standard such as Hind III digested phage lambda

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DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

ionic bonds between the pair of bases
None of these
covalent bonds between the pair of bases
hydrogen bonds between the pair of bases

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DNA Structure and Replication
Overwinding or overtightening of DNA during replication is caused and removed by

Single stranded protein, DNAa
DNAb, gyrase
DNAb, DNA polymerase
DNAa, gyrase

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DNA Structure and Replication
The replication of a linear DNA molecule in a eukaryotic chromosome creates a problem which is reported to be sorted out by

None of these
using RNA as a template
using enzyme called telomerase
shortening of the double stranded replicated portion

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