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How does DNA replication occur in eukaryotes?

DNA replication involves a ‘complex system of enzymes'. DNA replication is semiconservative (1 stand of the original 2 stranded piece of DNA is conserved) It is a complex process involving many enzymes and w...
Answered by • Biology tutor
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What is the difference between simple diffusion and active transport?

Simple diffusion is the movement of a molecules from an area of high concentration to an area of low concentration across a semipermeable membrane. Diffusion happens in liquids and gases as their particles m...
SK
Answered by Simi K. • Biology tutor
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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 have ...
AT
Answered by Anish t. • Biology tutor
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What happens to blood cells in a dilute solution?

They will swell and burst as water will enter the cell through osmosis. Water is more concentrated outside of the cell than in so the cell bursts.
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Answered by Sarah O. • Biology tutor
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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 H+ ions and excites electrons which pass down the electron tansport chain ...
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