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Briefly describe the key differences and similarities between Prokaryotic and Eukaryotic Cells

Differences Prokaryotes are much smaller than eukaryotic cells. Prokaryotic cells are 0.5-5 microns in diameter compared to eukaryotic cells which are approx 50-100 microns. Another difference is that prokar...
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Answered by Oliver W. • Biology tutor
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Describe how oxygen in the air reaches capillaries surrounding alveoli in the lungs. Details of breathing are not required. (AQA Biol. 2016)

Oxygen diffuses from the air where it is present at a higher concentration and pressure, to the lungs where it is at a lower concentration and pressure - we say it moves 'down' these gradients; high to low. ...
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Answered by David M. • Biology tutor
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Explain how you may test a plant specimen for starch?

This can be done via the iodine test- you would use an iodine solution and pipette this unto the plant cutting. For a positive test, the specimen would turn into a blue/ black colour in the presence of iodine.
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Answered by Isabella M. • Biology tutor
3040 Views

Draw a punnet square between two carriers of cystic fibrosis and from this, work out the odds of their child being affected with CF.

I will draw the punnet square on the whiteboard. After drawing it, the ratio of CC:Cc:cc will be 1:2:1 As a recessive gene, only people with the homozygous recessive genotype (cc) will have cystic fibrosis s...
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Answered by Maddie B. • Biology tutor
4595 Views

Describe what is meant by the double circulation system of the heart.

The double circulatory system refers to the heart having two, connected, closed circuits. The first goes from the right ventricle of the heart to the lungs and back to heart via the left atrium. The second p...
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Answered by Ibrahim M. • Biology tutor
9543 Views