Top answers

Biology
A Level

How would you structure and answer the essay section of the exam?

Firstly, I advise that you spend a minimum of 40 minutes on this section. This will allow you enough time to make sure that you have answered all other questions and also give you time to plan and write y...

MH
Answered by Molly H. Biology tutor
3468 Views

What is osmosis

Let's say you have a bowl of water and you separate it into two compartments with a partially permeable membrane. This membrane does not allow proteins to pass through but it allows water to diffuse freel...

AV
Answered by Alexandru V. Biology tutor
2517 Views

What happens during transcription and translation?

Transcription and translation are both processes that are involved in converting nuclear DNA into proteins in eukaryotes, but they have two diifferent jobs. 1) Transcription The DN...

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Answered by Willow F. Biology tutor
15296 Views

Why does fetal haemoglobin have a higher affinity for oxygen than an adult haemoglobin?

In order to survive. By the time the blood reaches the placenta there is a lower concentration of oxygen in the blood, the fetal haemoglobin has a higher affinity for oxygen so that the hb can bind to oxy...

ES
Answered by Eden S. Biology tutor
43124 Views

Part of the retina of a young rat was removed and kept in the dark for two hours. This allowed the pigment in the rod cells to recover from bleaching caused by exposure to light. Suggest what happens in the rod cells during this two hours of darkness.

Rhodopsin is the pigment found in rod cells, which consists of cis-retinal and the protein opsin. When the rod cells are kept in darkness, the opsin is uncoupled from the cell surface membrane of the rod ...

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Answered by Panos L. Biology tutor
5043 Views

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