Describe transport mechanisms across cell membranes. Give an example of each.
Candidates were able to list types of transport across cell membranes but frequently
described them incorrectly or gave an incorrect example. In a number of answers, there was
confusion between facilitated diffusion and secondary active transport. Though diagrams
were not required,several Candidates used a diagram of the cell very effectively to illustrate
the mechanisms of transport across the membrane. For a good answer, some mention and
description of exocytosis, endocytosis, ion channels, facilitated diffusion, passive diffusion,
primary and secondary active transport was expected.
Diagrams were not required, they said. But clearly they didn't hurt those "several Candidates". Obviously one has only a minute or two to hastily sketch a few transport systems in this scenario. This minimum of artistic effort is represented here with the aid of a cheap nasty Illustrator diagram.
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