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Biology
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What is natural selection and how is it different from evolution?

Natural selection can be defined as: The gradual process in which inherited characteristics become more or less common in a population, in response to the environment determining the breeding success of i...

Answered by Harry C. Biology tutor
2013 Views

How is blood glucose regulated?

High blood glucose levels - such as following a large, carbohydrate rich meal. The increase is detected by Beta cells of the pancreas, which relea...

Answered by Lois K. Biology tutor
2252 Views

TMV (tobacco mosaic virus) can cause plants to produce less chlorophyll. This causes leaf discoloration. Explain why plants with TMV have stunted growth.

The virus is causing less chlorophyll to be produced. This is a problem as chlorophyll is an essential component in photosynthesis. Photosynthesis is a process by which plants are able to use sunlight in ...

Answered by Reece S. Biology tutor
10529 Views

Messenger RNA (mRNA) is used during translation to form polypeptides. Describe how mRNA is produced in the nucleus of a cell.

This question, from an AQA past paper, is worth 6 marks and it is asking for you to describe the process of transcription - you do not have to explain or say why things happen. You should make 6...

Answered by Tessa M. Biology tutor
2178 Views

Name 3 possible functions for a membrane protein, and name an example for each.

  1. Enzymatic activity. E.g. ATP synthase found in the inner mitochondrial membrane catalyses the synthesis of ATP. 2) Transport of substances. E.g. Aquaporins are integral membrane proteins that are as...
Answered by Celia N. Biology tutor
2205 Views

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