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Describe how muscle cells contract

An action potential depolarises the sarcoma and depolarisation travels down the T-tubules to the sarcoplasmic reticulum, which releases Ca2+ (calcium ions) to the sarcoplasm. Ca2+ ca...

Answered by Maria S. Biology tutor
2368 Views

Describe the process of ultrafiltration in the Kidneys.

Ultrafiltration occurs in the nephron, the functional unit of the kidney. Blood enters a coiled network of vessels called the glomerulus from the afferent arteriole at a high hydrostatic pressure. The glo...

Answered by Matthew M. Biology tutor
18161 Views

Describe the structure of globular proteins.

There are 4 levels of structure associated with a globular protein; primary, secondary, tertiary and quarternary. The primary structure is the organisation of amino acids, bonded by peptide bonds. The sec...

Answered by Charlie K. Biology tutor
8717 Views

Explain eutrophication.

How I would explain to the student:pollution of streams and rivers because of fertiliser use, open sewers into water courseexcess nutrients get washed up in water courseplants flourish using these mineral...

Answered by Tutor165211 D. Biology tutor
2165 Views

Explain the post-transcriptional changes that occur in mRNA before translation.

After DNA has been transcribed into mRNA but before is it is translated into it's polypeptide amino acid chain, post-transcriptional changes take place.DNA, and therefore its corresponding mRNA are made u...

Answered by Ellen C. Biology tutor
2641 Views

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