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Biology
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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 ...

RS
Answered by Reece S. Biology tutor
11561 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...

TM
Answered by Tessa M. Biology tutor
2417 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...
CN
Answered by Celia N. Biology tutor
2435 Views

How does a stimulus produce an action potential?

The cell begins at a resting potential of -85mV with a high concentration of potassium (K+) inside the cell. The stimulus must be strong enough to produce the all or nothing response which triggers the op...

MT
Answered by Meirion T. Biology tutor
2844 Views

Describe the main stages of cell division

Interphage: G1 phase = Increased metabolic reactions, protein synthesis, organelle production, cell checks whether to divide or not S phase = DNA replication --> creation of sister chromatids G2 phase ...

ZG
Answered by Zoe G. Biology tutor
1926 Views

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