Top answers

How are proteins made?

In the nucleus, DNA helicase breaks hydrogen bonds between the bases on DNA causing the DNA strand to unwind.The template strand acts as a template for mRNA production during which complimentary nucleotides ...
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Answered by Adiba M. • Biology tutor
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How are plant cells adapted for photosynthsis

Plant cells have a thick waxy cuticle which is transparent to allow sunlight to pass through and it also minimises water loss. There are air spaces in the spongy mesophyll which allows gas exchange to occur ...
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Answered by Adiba M. • Biology tutor
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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 the ...
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Answered by Emily L. • Biology tutor
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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 th...
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Answered by Sam F. • Biology tutor
5372 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 the action potential ...
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Answered by Alice F. • Biology tutor
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