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Biology
A Level

Describe the similarities and differences in structure between DNA and RNA

Both DNA and RNA are molecules related to protein coding in a cell. The basic structure has a carbon sugar backbone with 4 different nitrogenous bases. In DNA there are two of these strands connected by ...

EL
Answered by Emily L. Biology tutor
2726 Views

Describe how phagocytosis of a virus leads to presentation of its antigen

The phagosome containing the virus fuses with the lysosome, which then releases hydrolytic enzymes. These enzymes then destroy the virus, and the antigens from the virus are consequently incorporated into...

SF
Answered by Sam F. Biology tutor
4155 Views

How does an action potential travel between two neurones?

When an action potential reaches the end of one neurone, it cannot simply move to the next one as there is a gap (the synapse or synaptic cleft) between the two neurones. Instead, when th...

AF
Answered by Alice F. Biology tutor
2295 Views

Why are antibiotics not used to treat viral infections?

Antibiotics target a variety of sites on bacteria (disruption DNA or cell wall or protein synthesis). These are not found in viruses - viruses lack cell walls, ribosomes or cell membranes.Antibiotics woul...

KL
Answered by Karl L. Biology tutor
3135 Views

Give one method of immobilising an enzyme. What are the benefits of using immobilised enzymes?

Methods:encapsulate in sodium alginate beadstrap in the pores of silica geladsorption onto glass or clay or resinwithin a polymer or microspheresby covalent bonding to a support material such as collagen<...

KL
Answered by Karl L. Biology tutor
2122 Views

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