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Biology

A Level

Explain the process of DNA replication an state why it is called semi-conservative.

During DNA replication, DNA helicase attaches itself to the double stranded DNA and breaks the hydrogen bonds between the 2 strands. Next, free nucleotides pair with complementary bases on each strand of ...

Answered by Akthar Hussain M. • Biology tutor

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Outline the sequence of events following the production of extracellular proteins that leads to their release from the cell. [3]

keywords: outline sequence following production extracellular step 1) protien is folded by rough endoplasmic reticulum and re

Answered by Alia H. • Biology tutor

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Describe the primary and secondary structure of proteins

Primary structure:
Due to the bonding and the shape and chemical nature of different amino acids, the shape of a whole chain of amino acids (a polypeptide or protein) is

Answered by Katerina S. • Biology tutor

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Outline the process of DNA replication

During DNA replication the double-stranded DNA helix is separated to single strands by the enzyme DNA helicase. This exposes the nucleic acid bases that encode the genetic sequence. Replication is then in...

Answered by Lorna W. • Biology tutor

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Briefly describe the main differences between fast and slow twitch muscles and how does this relate to their specific functions.

First of all, slow-twitch (type I) muscle fibres have a large number of mitochondria allowing them to carry out aerobic respiration at a high rate by providing a site for the Kreb's cycle (taking ...

Answered by Sebastian G. • Biology tutor

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