Describe the process of DNA replication
In DNA replication, first the hydrogen bonds between the nitrogenous bases are broken catalysed by the enzyme helicase, causing the DNA double helix to unwind and unzip, leaving the nitrogenous bases exposed. Free bases in the nucleus then form hydrogen bonds with the exposed bases, following complementary base pairing rules, so guanine binds to cystine and thymine binds to adenine. The sugar phosphate backbone is then formed in the 5' to 3' direction, with the phosphodiester bonds formed catalysed by the enzyme DNA polymerase. This forms a new double helix. DNA replication is semi conservative as one strand is from the original DNA molecule and one stand is newly synthesized.
HN
Related Biology A Level answers
All answers ▸Is normal expiration, at rest, a passive or active process in a healthy individual? And why?
What is the difference between competitive and non competitive inhibitors?
Describe how the resting potential is maintained in a neurone, and what this resting potential value is.
Why is the actual yield of ATP during aerobic respiration lower than the theoretical yield of 38 ATP molecules?