The DNA molecule takes a complete turn after
(1) Every base pair
(2) Every five base pairs
(3) Every ten base pairs
(4) Every two base pairs
Which of the following is correct with regards to the arrangement of DNA in the chromosome?
(1)There are several DNA helices in a chromosome , which are joined together with the help of the protein linkers
(2)Each chromosome has bundles of DNA duplexes , much like a rope
(3)A single DNA double helix is highly coiled and folded along the length of the chromosome
(4)Each chromosome is made up of two DNA helices , which are highly folded
In his experiment on the chemistry of DNA, Chargaff estimated the base composition of human sperms and found Adenine is 19%, then the amount of Thymine in somatic cell will be
(1)19%
(2)31%
(3)38%
(4)62%
Semi-conservative nature of the replication of eukaryotic chromosome was experimentally demonstrated by
(1)Chains
(2)Meselson and Stahl
(3)Hebert Taylor
(4)Hershey and Chase
The short fragment of DNA produced in the lagging strand during duplication is known as
(1)Okazaki fragments
(2)RNA primer
(3)Leading strand
(4)Recombinant DNA
How many times can the nuclear DNA replicate during the life cycle of a cell?
(1)Only once
(2)Twice
(3)Many times
(4)Does not replicate at all
In DNA replication, the two strands of a daughter DNA molecules are derived as follows
(1) one strand from parent DNA and the other freshly synthesized
(2) both strands from parent DNA
(3) both strands synthesized as templates on parent strands
(4) both strands synthesized on RNA templates of parent strands
DNA replication in most organisms is
(1)conservative and continuous
(2)semi-conservative but discontinuous
(3)semi-conservative and semi-discontinuous
(4)semi-conservative but continuous
Borne viruses do not have DNA. This suggests that
(1)They are non-infective viruses
(2)RNA is the genetic material in these viruses
(3)DNA is not the genetic material
(4)RNA is a self replicating molecule
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