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Describe the key features of an exchange surface

exchange surfaces require a small diffusion distance enabling the fast exchange of compounds, good blood supply to maintain a concentration gradient. This allows for the most efficient diffusion
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Answered by Zoe S. • Biology tutor
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Explain covalent bonding and give an example of a simple covalent molecule.

A covalent bond is a shared pair of electrons between 2 atoms.An example of a simple covalent molecule is CH 4 (methane)
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Answered by Zoe S. • Chemistry tutor
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What are the differences between DNA replication and mRNA transcription?

The major difference between both of these processes is why they are used, DNA replication is used for cell division in the S phase of the cell cycle. mRNA transcription is used in protein synthesis and ther...
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Answered by Phoebe C. • Biology tutor
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Haemophilia is a disease that affects blood clotting. People with haemophilia are sometimes given a protein called factor VIII. Factor VIII is an enzyme that is involved in the process of blood clotting. Explain how a change in the primary structure of f

A protein is made up of amino acid subunits, in which the primary structure is the sequence of the amino acids. Therefore a change in the primary structure will result in a different sequence of amino acids....
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Answered by Naimah C. • Biology tutor
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What does consumer surplus mean?

Consumer surplus can be thought of as the feeling of getting a really good deal or a bargain. It happens when you would have been willing to pay an amount for something but the price was actually lower. What...
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Answered by Georgia B. • Economics tutor
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