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Biology

A Level

How is a growth curve of microorganisms shaped? What happens during the different phases?

The growth of most microorganisms can be divided into four different phases:Lag phase - Small populations start to replicate slowly. Replication is 'lagging' as microorganisms are adapting to condit...

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Describe the function of phospholipids in the human body

Phospholipids play a huge role in the human body. They are the main components of the cell membranes. They have a hydrophobic and a hydrophilic part.

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How are red blood cells well adapted to their function?

Firstly red blood cells have very few organelles, losing many of them such as the nucleus in order to maximise the amount of haemoglobin they can hold. Furthermore they are relitavely thin meaning they ha...

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Explain the role of the coenzymes NADH and FADH2 in oxidative phosphorylation and why it is significant. (6 marks)

NADH and FADH2 oxidised to NAD and FAD in the marix by electron carrier proteins in the inter mitochondrial membrane.This liberates

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How do the properties of water make it a suitable environment for many organisms?

Water has an extremely high specific heat capacity. This means it requires large amounts of energy to increase its temperature, making it a constant environment. When water freezes the structure changes. ...

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