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Standard XII
Biology
Prokaryotic Cell
Structure of ...
Question
Structure of double stranded DNA and single stranded DNA
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Q.
Which of the following nucleic acids is present in an organism having 70S ribosome only?
Q.
The double-stranded helical structure of the DNA was proposed by
Q.
A single chromosomes consists of
molecules of double stranded DNA.
Q.
Which enzyme present in retroviruses converts single stranded RNA into a double stranded viral DNA?
Q.
Match List I(Enzyme) with List II(Function) and select the correct answer using the codes given the lists.
List-I
List-II
a. DNA Ligase
1
. Catalyses the covalent union of segments of an interrupted sugarphosphate strand in double-stranded DNA
b. DNA polymerase
2
. End nuclease that digests either single stranded or double stranded DNA
c. DNase I
3
. Produces single or double stranded breaks in DNA during replication to release tension brought about by the separation of double strands
d. DNA topoisomerase
4
. Catalyses the formation of DNA worn deoxyribonucleotides using one strand of DNA as template
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