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Discuss the evolutionary order of appearance of the mitochondrion, chloroplast and ribosome, explaining your reasoning

By considering which organisms have each of the referred organelles, we can infer their evolutionary order of appearance.Ribosomes are present in every living cells, whereas mitochondria and chloroplasts are...
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Answered by Maria P. • Biology tutor
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Please compare and contrast the structure of human blood vessels.

There are three blood vessel types in humans: arteries, veins and capillaries.Arteries pump blood away from the heart (easy point to remember - "A" in arteries = AWAY from the heart) while veins pu...
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Answered by Hansika R. • Biology tutor
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Describe the steps of mitosis. (10 Marks)

One mark is given for correctly naming each step (of which there are 7 possibilities). Another is given for a correct description of each stage.Prophase: Chromatin condenses to chromosomes / nucleolus disapp...
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Answered by Michael G. • Biology tutor
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How does temperature effect enzymes?

Under 0 degree celcius, ice crystals will begin to form in the cell membrane of the enzyme. If the temperature increases and the enzyme thaws, the pierced cell membrane will cause leakage and prevent the enz...
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Answered by Erin H. • Biology tutor
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What is osmosis?

Osmosis is the passive movement of a solvent, for example water, through a semipermeable membrane, such as one of a living cell, into a solution of higher solute concentration than the starting solute concen...
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Answered by Sophie M. • Biology tutor
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