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A bacterial infection that cannot be treated with one sort of penicillin can be treated with a different sort. Use your knowledge of enzyme action to explain why the different sort of penicillin is effective in treating the infection.

Penicillin inhibits an enzyme that forms cross links in bacterial cell walls halting bacterial reproduction. Different penicillins have different shapes or structures. The penicillin that is not effective in...
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Answered by Georgia D. • Biology tutor
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Explain how the intensive rearing of domestic livestock increases net productivity

Productive animals are selectively bred to ensure the next offspring will be equally, if not more productive. These young animals are kept inside in warm conditions to limit energy loss due to maintaining bo...
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Answered by James A. • Biology tutor
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Nitrate from fertiliser applied to crops may enter ponds and lakes. Explain how nitrate may cause the death of fish in fresh water.

The applied nitrates may seep into water sources from the fields at times of rainfall. Here, they increase the nitrate concentration in the water, leading to an algal bloom. This layer of surface algae block...
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Answered by James A. • Biology tutor
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Describe the process of allopatric speciation. How does this differ from sympatric speciation?

Basic level answer Description of some form of geographical separation leading to isolated populations Referencing reduced interbreeding and the development of differences between populations Identify that s...
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Answered by James K. • Biology tutor
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Explain the process starch goes through from when it enters your mouth to your small intestine.

I would look at what starch is, what process is happening and how does it happen: Starch molecules are carbohydrates composed of sugar monomers of carbon, hydrogen and oxygen, a single sugar molecule is call...
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Answered by Lucy O. • Biology tutor
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