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Biology
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What hormones are involved in a pregnancy test and how does it work ? (6 marks)

After the human embryo implants in the uterus, the site of the developing placenta begins to produce a chemical called human chorionic gonadotrophin (hCG). hCG is a hormone that is found in the blood and ...

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Answered by Ellie B. Biology tutor
17478 Views

Why would a cell lyse when it's in water?

Lysis, or the bursting of a cell, happens because of a cell swelling excessively causing it to burst, due to the movement of water into the cell by osmosis. However, this isn't the case for all cells!

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Answered by Ashar A. Biology tutor
16156 Views

What is the role of the nucleus?

The nucleus is the most important organelle of the cell and acts like a blueprint for how all the cells in your body function. The nucleus also acts as a vault to hold the DNA securely.
The main func...

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Answered by Ameliya D. Biology tutor
26367 Views

How does Haemoglobin work?

Haemoglobin is a protein made up of 4 sub-units. Each sub-unit has a molecule of un-oxygenated Iron. Oxygen covalently bonds to the Iron and is thereby carried by the blood as Oxy-haemoglobin. Oxy-haemogl...

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Answered by Conor J. Biology tutor
10397 Views

Define an organ

A group of similar tissues that work together to perform a particular function.

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Answered by Jonathan J. Biology tutor
3901 Views

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