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Describe the stages of phagocytosis (4 marks)

the phagocyte recognises the antigen on the pathogen surface as foreignThe phagocyte cytoplasm moves around the pathogen, and the membranes fuse, forming a phagosomeLysosomes containing lysozymes fuse with t...
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Answered by Aislinn M. • Biology tutor
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Describe the process of DNA transcription:

The DNA double helix unravels as helicase breaks the hydrogen bonds between base pairs. RNA polymerase binds to the promoter region on the DNA strand. The RNA polymerase transcribes the DNA coding strand by ...
EC
Answered by Erin C. • Biology tutor
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Compare anaerobic respiration in a yeast cell with anaerobic respiration in a muscle cell.

Anaerobic respiration in yeast cells produces carbon dioxide and ethanol. Whereas anaerobic respiration in muscle cells produces lactic acid only.Both, however, do produce little amounts of ATP (energy)
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Answered by Chloe S. • Biology tutor
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Describe the process of the Krebs cycle.

Acetyl CoA (2 carbon compound) from the link reaction combines with a 4 carbon compound called oxaloacetate. This reaction releases the CoA enzyme allowing it to be re-used. The now 6 carbon compound (citric...
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Answered by Chloe S. • Biology tutor
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In a healthy person the blood glucose level in the hepatic vein fluctuates much less than that in the hepatic portal vein. Explain why.

Firstly, blood glucose in the hepatic portal vein increases after a meal and this is due to the hepatic portal vein transporting blood from the gut to the Liver. Therefore, blood glucose will increase as foo...
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Answered by Lucinda G. • Biology tutor
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