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What is an enzyme?

An enzyme is a protein that act as a biologcal catalyst, meaning that they will activate a biological reaction. Enzymes are very specific and will work with a specific substrate. You can think of an enzyme a...
LJ
Answered by Laureen J. • Biology tutor
6483 Views

State and explain two adaptations of a red blood cell?

Red blood cells have a biconcave disk shape, meaning that it increases their surface area and allows for more rapid diffusion of oxygen into and out of the cell. Red blood cells do not have a nucleus so they...
JD
Answered by Joe D. • Biology tutor
25633 Views

What is an easy way to pick up marks in the biology GCSE?

Biology GCSE like any other requires a basic level of understanding, but in addition it requires you to use scientific terminology. By using specific words or descriptions in your answers you make it easier ...
EC
Answered by Eleanor C. • Biology tutor
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How do white blood cells defend against invading pathogens?

They can engulf and ingest pathogens; this is essentially the white blood 'eats' the pathogen. They secrete (release) antitoxins which counteract the toxins released by pathogens. The toxins they release are...
EM
Answered by Emily M. • Biology tutor
15069 Views

What is a proposed model for enzyme activity?

The lock and key model: Only substrates of a specific shape that is complementary to the active site of an enzyme can fit into the active site, in a way that is analagous to a key fitting into a lock.
AP
Answered by Alastair P. • Biology tutor
5231 Views