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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 ...
LZ
Answered by Lijun Z. • Biology tutor
22398 Views

How should I respond to questions which ask me to deal with a source?

Your answer needs to deal with a few different aspects of the source while also drawing on your own knowledge to interrogate what you are reading. Firstly, you need to show that you understand what the sourc...
CM
Answered by Conor M. • History 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...
MC
Answered by Meral C. • Biology tutor
3627 Views

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...
MC
Answered by Meral C. • Biology tutor
7125 Views

How much force is needed to bring a car to a halt over 5 seconds - the car is moving with velocity km/hr and with a mass of 1000kg.

Explain the concept of momentum mathematically, then draw on physical intuition to reaffirm/deepen their understandingDiscuss how there exists a relationship between the rate of change of momentum and forceU...
HL
Answered by Harrison L. • Physics tutor
2435 Views