What happens when DNA helicase acts on the DNA strands?

Short pieces of DNA synthesized on the lagging strand ______

What are DNA ligases?

Name the enzyme that is involved in the unwinding of the DNA strands?

Which of the following statements are correct ? (i) Restriction enzymes cut the strand of DNA a little away from the centre of the palindrome site, but between the same two bases on the opposite strands. (ii) Hind ll always cuts DNA molecules at a particular point by reconginisng a specific sequence of six base pairs. (iii) Separated DNA fragments cannot be visualised without staining on an agarose gel electrophoresis. (iv) 'Ori' is the sequence responsible for controlling the copy number. (v) DNA is a positively charged molecule.

What happens to the phage DNA in the lysogenic cycle of multiplication?

The base sequence in one of the DNA strand is TAGCATGAT. Mention the base sequence in its complementary strand.

An intersting property of restriction enzymes is molecular cutting and past-ing. Restriction enzymes typically recognize a symmetrical sequence of DNA . Notice that the top strand is the same as the bottom strand, but reads backward . When the enzyme cuts the strand between G and A, it leaves over-hanging chains a. What is this symmetrical sequence of DNA known as ? b. What is the significance of these overhanging chains ? c. Name the restriction enzyme that cuts the strand between G and A.

Given below is a sample of a portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it? 5'_____ GAATTC_______3' 3_______CTTAAG_______5'