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Describe how phagocytosis of a virus leads to presentation of its antigens and how presentation of this antigen leads to the secretion of an antibody against this virus antigen.

The macrophage engulfs the virus and the phagosome fuses with a lysosome, the virus is then broken down by hydrolytic enzymes inside the lysosome, and virus' antigens are displayed on the cell surface mem...

Answered by Oenone R. • Biology tutor

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Explain the mechanism of synaptic transmission.

Synapses are the physical gaps that separate neurons from other cells. Neurons transmit information across synapses by converting the electrical signal into a chemical signal, usually neurotransmitters. T...

Answered by Lauren D. • Biology tutor

4317 Views

Describe how a cell produces a mature protein from DNA, including the main enzymes involved and where each stage takes place.

Initially, the double helix structure of DNA is broken down by DNA helicase in the region of the gene encoding the protein. Then the template strand of the gene is transcribed into RNA by RNA polymerase. ...

Answered by Glyndwr J. • Biology tutor

1317 Views

Give two ways in which the presence of synapses are advantageous to the nervous system.

They ensure unidirectional transmission - Nerve impulses can also pass from the pre-synaptic neurone to the post-synaptic neurone. This is due to the neurotransmitter being made in the pre-synaptic membra...

Answered by Lucy C. • Biology tutor

2706 Views

How does the cell divide?

The cell divides through four stages:ProphaseMetaphaseAnaphaseTelophase and CytokinesisBefore prophase the DNA, genetic material of the cell, is coiled and not visible. All that is visible is a dark patch...

Answered by Klara H. • Biology tutor

1538 Views