Top answers

Biology
GCSE

If cells can respire anaerobically, why do humans need oxygen?

Cells can indeed respire - or release energy - without oxygen, using anaerobic respiration. Here, energy is released from glucose to generate a substance called lactic acid. This is a good temporary solut...

SJ
Answered by Samuel J. • Biology tutor
24141 Views

In the food web shown: Heather -> Rabbit -> Fox, only a small percentage of the Sun’s energy captured by the heather is eventually incorporated into the body tissues of the fox. Explain what happens to the rest of the energy captured by the heather.

To get all FIVE marks for this question, there needs to be FIVE clear, balanced and detailed explanations.

- Respiration

CD
Answered by Chaitya D. • Biology tutor
9055 Views

Explain why diffusion is an important process in plants and animals.

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient. Lots of essential processes rely on this movement such as the diffu...

RJ
Answered by Rahul J. • Biology tutor
22164 Views

what is osmosis and give an example?

Osmosis is the passive movement of water through a partially permeable membrane from a high concentration of water to a low concentration of water. An example of this is when water moves from soil into a ...

GM
Answered by Gilly M. • Biology tutor
4420 Views

Describe the use of PCR and how exponential amplification can be achieved.

Polymerase chain reaction (PCR) is a technique used in molecular biology to amplify a single copy or a few copies of a segment of DNA across several orders of magnitude, ...

SB
Answered by Sam B. • Biology tutor
7848 Views

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