Top answers

Biology
A Level

What's the difference between the cell wall and cell membrane?

Cell wall:

Only present in plant cells, it provides structure and is completely permeable to biological molecules.

 

Cell membrane:

Much thinner than cell wall and is p...

JD
Answered by Joel D. Biology tutor
7764 Views

In genetics, what does co-dominance mean?

Dominant alleles need the presence of only one copy to ach...

MT
Answered by Michael T. Biology tutor
5511 Views

Where did mitochondria come from?

Mitochondria are a fascinating organelle, which we, as humans, rely on for so much. They are where the electron transport chain occurs, where ADP is conv...

PQ
Answered by Patrick Q. Biology tutor
5482 Views

What is the name of the first stage of respiration?

Glycolysis. This is an anaeorbic process whereby glucose is converted to pyruvate via triose phosphate. This process gives out a total of 4 ATP molecules but requires 2 ATP molecules to convert glucos...

AS
Answered by Adam S. Biology tutor
3673 Views

How does an action potential cause contraction in skeletal muscle?

The point at which a motor neurone synapses with a muscle fibre is called the neuromuscular junction. The unmyelinated nerve fibre stops around 30 nanometers before the muscle fibre, leaving a gap cal...

OM
Answered by Orla M. Biology tutor
11583 Views

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