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What happens during mitosis

Mitosis is the seperation of DNA. There are 4 stages of mitosis that you need to be aware of for A level Biology: Prophase, Metahase, Anaphase and Telophase. (I like to remember this order as P.Mat) During p...
RW
Answered by Ruth W. • Biology tutor
3309 Views

Cannabinoid receptors are found in the pre-synaptic membrane of neuromuscular junctions. When a cannabinoid binds to its receptor, it closes calcium ion channels. Suggest how cannabinoids could prevent muscles contraction?

This question is asking you to explain how action potentials travel across neuromuscular junctions and how the closure of calcium ion channels would prevent the signal travelling across the junction, so woul...
CF
Answered by Charlotte F. • Biology tutor
6903 Views

How does the electron transport chain operate during respiration?

Membrane proteins on the inner membrane of the mitochondria carry the electrons from the reduced NAD and FAD along the membrane, causing the electrons to lose energy as they move down their energy levels. As...
LB
Answered by Lydia B. • Biology tutor
3485 Views

What is spermatogenesis ?

Gametogenesis is the process that converts primordial germ cells (PGCs) into mature male and female gametes. There are two types spermatogenesis and oogenesis specific to males and females respectively. Sper...
KE
Answered by Kareen E. • Biology tutor
11523 Views

How does translocation occur in the phloem?

Active transport occurs at the source, loading assimilates e.g. from photosynthesis in a leaf. This is carried out by specialised companion cells, via active pumping of hydrogen ions out of the cell, and cot...
JL
Answered by Julie L. • Biology tutor
7282 Views