Top answers

Describe the process of phagocytosis.

Phagocytosis begins when white cells called phagocytes recognise bacteria invading the body (pathogens). The cell membrane of one of these phagocytes then fuses around a single bacterium, engulfing it within...
AN
Answered by Abia N. • Biology tutor
35299 Views

Describe the mechanism of mammalian breathing.

The process of breathing is made up of two components: Inhalation Exhalation Inhalation is the process of filling the lungs with air. As they fill they expand and so the rib cage moves upwards and outwards. ...
RR
Answered by Rebecca R. • Biology tutor
18088 Views

What is a Single Nucleotide Polymorphism?

If two sequences of DNA from the same position along a DNA strand (locus) have a single change between them we call them single nucleotide (one base unit of DNA, A/T/C/G) polymorphism (poly- "many-&quot...
TK
Answered by Thomas K. • Biology tutor
3451 Views

The black mamba’s toxin kills prey by preventing their breathing. It does this by inhibiting the enzyme acetylcholinesterase at neuromuscular junctions. Use your knowledge of muscle contraction to explain how this prevents breathing.

By inhibiting the enzyme acetylcholinesterase, the neurotransmitter acetylcholine does not get broken down. This causes acetylcholine to build up in the synapse between the motor neurones and muscles of resp...
TC
Answered by Tashi C. • Biology tutor
9769 Views

Outline the importance of the junctions between neurones in the functioning of the nervous system

DEFINE: Key words What is a junction, what is a neurone and what is the nervous system? So, the nervous system connects all the nerve cells and fibres which transmit nerve impulses from one part of the body ...
NK
Answered by Natasha K. • Biology tutor
7531 Views