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  • Biology Factsheet: 160. Countercurrent Flow in Biology

    Biology Factsheet: 160. Countercurrent Flow in Biology

    Countercurrent flow is a mechanism which maintains diffusion  gradients across membranes. In turn, this means that transport or  exchange of substances across the membrane can be fast and&...

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  • Biology Factsheet: 161. Negative Feedback Mechanisms

    Biology Factsheet: 161. Negative Feedback Mechanisms

    This Factsheet summarises the most important examples of negative  feedback in living organisms....

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  • Biology Factsheet: 162. The Biology of HIV

    Biology Factsheet: 162. The Biology of HIV

    HIV is on all A level specifications. Exam questions are common  and relatively straightforward. You simply need to learn a few facts  and then practice applying this knowledge to the type...

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  • Biology Factsheet: 163. Answering Questions: enzyme activity

    Biology Factsheet: 163. Answering Questions: enzyme activity

    This Factsheet summarises the most common questions about enzyme activity that have appeared over the 5 years on all the Boards. ...

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  • Biology Factsheet: 164. Recording Plant Species

    Biology Factsheet: 164. Recording Plant Species

    Practical ecological techniques frequently appear in exam questions  but many candidates have not had much opportunity to actually  get out there and measure things. This Factsheet sets ou...

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  • Biology Factsheet: 165. Surface Area and Volume

    Biology Factsheet: 165. Surface Area and Volume

    The surface area to volume ratio is a crucial biological concept. It  helps explain, amongst other things why:  • organisms that rely upon diffusion are condemned forever to be  ...

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  • Biology Factsheet: 166. Answering Exam Questions: Kidney problems

    Biology Factsheet: 166. Answering Exam Questions: Kidney problems

    Exam questions sometimes test student’s understanding of the kidney and of basic physiological processes by focusing on kidney  problems. Such questions, which are usually based on dialysi...

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  • Biology Factsheet: 167. Biosensors

    Biology Factsheet: 167. Biosensors

    A biosensor is an analytical instrument which converts a biological response into an electrical signal. They are to detect specific  substances or conditions. For example, a glucose biosensor ca...

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  • Biology Factsheet: 168. Gamete Formation in Animals

    Biology Factsheet: 168. Gamete Formation in Animals

    The process of gamete formation is called gametogenesis. It occurs  in all sexually reproducing organisms....

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  • Biology Factsheet: 169. Answering Exam Questions on Immunity and Vaccines

    Biology Factsheet: 169. Answering Exam Questions on Immunity and Vaccines

    This Factsheet concentrates on common misunderatandings about  vaccines and immunity. These topics are on every exam board and  application questions are common....

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