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Explain how partial pressure of oxygen affects how oxygen binds to haemoglobin in different areas of the body.

In the lungs, the partial pressure of oxygen is high therefore haemoglobin readily binds to the oxygen. This causes the haemoglobin to undergo a conformational change and increase its affinity for oxygen so ...
VA
Answered by Vinisha A. • Biology tutor
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Describe what happens when an action potential reaches an axon terminal.

When an action potential reaches an axon terminal, the depolarisation from causes voltage-gated calcium ion channels in the plasma membrane of the synaptic knob to open. As there is a much higher concentrati...
SJ
Answered by Sian J. • Biology tutor
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What are the four bases found in DNA and how do they bond.

There are four DNA bases, Adenine (A), Cytosine (C), Guanine (G) and Thymine (T). On each strand of DNA, the DNA bases are connected by phosphodiester bonds, to form a long chain. These long DNA strands are ...
TJ
Answered by Toby J. • Biology tutor
19420 Views

How do I get full marks for this question "Describe how a vaccination leads to antibody production" ?

Mark 1: What is a vaccine? A vaccine contains antigens from an inactive form of a specific pathogen. Mark 2: Which cells are first to respond to the antigen? Antigen presenting cells such as macrophages pres...
CT
Answered by Chloe T. • Biology tutor
3233 Views

A patient is infected by a pathogen. Explain the process of the imitation of the immune response (5 marks) The paitent was prescribed antibiotics yet their symptoms did not improve. What can you infer from this? (1 mark)?

5 of the following... Pathogen has antigens on its surface that are recognised as foreign by the immune system T helper cells stimulate cytotoxic T cells, B cells and phagocytes (or lysosomes) B cells produc...
HF
Answered by Harriett F. • Biology tutor
2833 Views