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How could ionic interactions be used in DNA-RNA hybridisation?

The DNA double helix consists of many hydrogen bonds between the base pairs, but in addition there are negatively charged phosphate molecules as a key component of the sugar-phosphate backbone of DNA strands...
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Answered by Mohammed A. • Biology tutor
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Explain how a change in an allele can stop a protein functioning correctly. (4)

If there is a change in the allele, there will be a change in base sequence of DNA (1) This means there is a change in order of amino acids (1) Therefore the protein shape changes (1) Hence, the protein may ...
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Answered by Lima H. • Biology tutor
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Compare and contrast facilitated diffusion and osmosis.

Facilitated diffusion is the process whereby substances are move down a concentration gradient, from a region of high concentration to a region of low concentration, using a protein as a carrier or a channel...
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Answered by Sanjana C. • Biology tutor
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Why does cystic fibrosis increase the risk of lung infections?

Cystic fibrosis is a genetic disorder of the CFTR protein, which alters the salt and water balance in the body fluids. Specifically in the lungs, this causes the mucous in the airways to retain less water, m...
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Answered by Mahum K. • Biology tutor
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How does glycogen act as a source of energy?

Glycogen is an energy storage molecule found in animal cells. It can be found in many different animal cells but is more prevalent in cells with a higher metabolic rate (those which use more energy), such as...
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Answered by Henry P. • Biology tutor
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