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What is the difference between diffusion and active transport?

Diffusion is passive (doesn't need use energy as ATP) where as active transport is active (by hydrolysis of ATP ) Diffusion is down a concentration gradient (from are high conc to low conc) where as active t...
LM
Answered by Leena M. • Biology tutor
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Describe and explain three differences between meiosis and mitosis

Mitosis consists of one cell division whereas meiosis consists of two cell divisions.Mitosis produces two genetically identical daughter with the same number of chromosomes as the parent cell whereas meiosis...
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Answered by Krishan P. • Biology tutor
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How does a pregnancy test work?

1) The wick of the pregnancy test is socked in urine. 2) The test contains mobile monoclonal antibodies with small coloured beads attached to them. 3) These mobile monoclonal antibodies only bind to hCG and ...
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Answered by Lijun Z. • Biology tutor
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Fertiliser, such as manure, contains ammonium compounds. Explain how the presence of soil bacteria and the use of manure improve crop yield. (6 marks)

Ammonium compounds in the manure are converted into nitrite , then into nitrate by nitrifying bacteria . Nitrate is then taken up by plants via active transport. Nitrogen fixing bacteria living in the nodule...
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Answered by Meral C. • Biology tutor
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During the light-independent reaction of photosynthesis, carbon dioxide is converted into organic substances. Describe how. (6marks)

Carbon dioxide from the atmosphere diffuses into the leaf through stomata and reaches stroma of chloroplast. In stroma, carbon dioxide combines with ribulose biphosphate (RuBP) in the presence of an enzyme c...
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Answered by Meral C. • Biology tutor
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