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What are the key components of DNA replication and what are their functions?

Original DNA template; DNA replication requires an existing double stranded DNA to copy. Free DNA nucleotides; free bases (ATCG) that can be added to the new DNA strand. DNA polymerase; the enzyme required t...
SM
Answered by Sophie M. • Biology tutor
6025 Views

Many enzymes present in cells require a catalyst to aid their actions. Describe the role of a catalyst.

A catalyst acts to lower the activation energy of the reaction. It speeds up the reaction without being used up. Binding of the catalyst alters the tertiary structure of the enzyme, causing the active site t...
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Answered by Charlotte B. • Biology tutor
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Describe the events of the cholinergic synapse

Action potential reaches neurone.Voltage gated Ca²+ channels in the presynaptic membrane open.Calcium ions flow in, pushing acetylcholine filled vesicles to the presynaptic membrane.Vesicles fuse with the me...
IB
Answered by Ioana B. • Biology tutor
6090 Views

Describe the way solutes are transported in a plant's vascular system

Solutes (e.g sucrose) are transported in the phloem from source to sink. Sucrose is made at the leaves in the plant, this is actively transported into the phloem via companion cells. T his then lowers the wa...
LV
Answered by Lily V. • Biology tutor
3176 Views

Could you explain how glucose is co-transported across the wall of the small intestine with sodium, please?

The purpose of glucose and sodium being transported across the epithelial cells of the small intestine is in order to move glucose across the cell against its concentration gradient. Because these two substa...
JC
Answered by Juliette C. • Biology tutor
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