Describe the process of eukaryotic DNA replication

DNA helicase unzips and unwinds the DNA double helix by breaking hydrogen bonds between complementary base pairs. This exposes the bases on two strands creating template strands. Free floating nucleotides are attracted to the exposed bases and bond to them via complementary base pairing (adenine-thymine and guanine-cytosine). DNA polymerase then joins the new nucleotides together in a series of condensation reactions forming phosphodiester bonds in the sugar-phosphate bakcbone.Two new DNA strands are made, each with one old strand and one new one therefore DNA is said to be replicated semi-conservatively.

LB

Related Biology A Level answers

All answers ▸

Describe the effects of cigarette smoke on the airway.


Describe and explain how the alveoli are adapted to facilitate effective gas exchange in the lungs.


a) Explain how an action potential is passed across a synapse b) Label the graph below with the steps of action potential generation c) The graph shows the results of a study on two groups taking different medication, is the difference significant?


Describe the role of calcium ions and ATP during muscle contraction