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Describe the four stages of mitosis

There are four stages of mitosis: prophase, metaphase, anaphase and telophase. 1) Prophase Chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromer...
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Answered by Jessica C. • Biology tutor
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How can you determine what the direction of the shift is in the Bohr effect?

Haemoglobin acts as the Oxygen transportation system for the body. It is comprised of 4 polypeptide chains (quaternary protein structure) and each chain has an attached haem group. Each haem group allows an ...
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Answered by Charlotte L. • Biology tutor
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Describe the structure of glycogen

Glycogen is a polysaccharide of alpha glucose, joined together by glycosidic bonds which provide a branched structure.
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Answered by Isabel S. • Biology tutor
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What is the process of DNA replication?

DNA replication involves many steps and enzymes. As DNA is a double stranded helix it must be untwisted so that it can be copied. Each strand from the parental DNA acts as a template for the daughter strand ...
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Answered by Jemima U. • Biology tutor
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How is a nerve impulse transmitted across a cholinergic synapse?

Action potential reaches pre-synaptic knob.This stimulates voltage gated Ca2+ channels to open and Ca2+ to diffuse in.This causes vesicles containing ACh to bind to the pre-synaptic membrane and release ACh ...
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Answered by Amelie M. • Biology tutor
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