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How are the lungs specialised for exchanging gases?

The lungs are made up of many air sacs called alveoli. The alveoli have many folds which create a large surface area. The larger the surface area, the greater the area of alveolar cell membrane available for...
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Answered by Laura A. • Biology tutor
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How does osmosis and diffusion work?

Osmosis and diffusion are two words used to describe the movement of molecules. Molecules are like people. They don't like to be squashed into small areas with lots of other molecules surrounding them. Molec...
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Answered by James D. • Biology tutor
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1) Gluconeogenesis 2) Glycogenesis 3) Glycolysis. Which is stimulated by glucagon production? [A] 1, 2, 3 [B]1 [C] 2, 3 [D] 1,2

B is the answer. Glucagon stimulates an increase in blood sugar/ [glucose] Gluco means glucose is the product Glyco means glycogen (storage of glucose in animals) is the product Neo means substrate is from a...
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Answered by James M. • Biology tutor
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Describe the different levels of protein structure during the production of a protein

Primary Structure : Peptide bonds form between the carboxyl and amino groups of adjacent amino acids, forming a long polypeptide chain . Secondary Structure : Reactions and interactions, such as hydrogen bon...
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Answered by Grace T. • Biology tutor
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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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