Top answers

What is the difference between catabolic and anabolic reactions? Give an example of a catabolic reaction you have studied.

In biology catabolic reactions are biochemical reactions during which an organic molecule is broken down. This process is usually involved in the production of energy. In contrast, anabolic reactions are bio...
GZ
Answered by Gabriele Z. • Biology tutor
2935 Views

Explain the steps of action potential across an axon membrane?

Resting Potential-3 Na+ out, 2 K+ in.Action potential- A stimulus is detected causing Sodium voltage gated channels to open, leading to Na+ to flow into the axon and therefor making the inside less negative....
IJ
Answered by Isabelle J. • Biology tutor
3356 Views

Why is DNA replication semi-conservative?

DNA is in a double helix structure, meaning there are two strands. When we need DNA to replicate, for example when a cell divides during growth, the strands undergo unwinding. This process is done by an enzy...
EC
Answered by Emma C. • Biology tutor
5573 Views

How are the alveoli adapted for gas exchange?

The alveoli are covered by a rich blood supply of capillaries- this provides a diffusion gradient for oxygen to move into the blood and carbon dioxide to move into the lungs.The alveoli are also highly folde...
FL
Answered by Fergus L. • Biology tutor
70924 Views

Ella has just finished running a half marathon. She hasn't been drinking enough water so is dehydrated and is feeling incredibly hot. Describe how her body responds to these changes. (6)

She is dehydrated so osmoreceptors in the hypothalamus shrink, this causes ADH to be secreted by the pituitary gland. The ADH travels in the blood stream and acts on the collecting ducts of the kidney nephro...
NH
Answered by Natasha H. • Biology tutor
3242 Views