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Biology
GCSE

How do organisms obtain energy?

Organisms, such as humans, take in "substrates" such as glucose, in our food.  During a process called respiration, we react these substrates with oxygen to give carbon dioxide and water; thi...

AR
Answered by Alastair R. • Biology tutor
31219 Views

What is meant by diffusion?

​What is diffusion?

Diffusion is a natural process, definied as the net movement of particles from an area of high concentration to an area of low concentration.

CM
Answered by Callum M. • Biology tutor
9351 Views

Why are enzymes less efficient at temperatures lower than body temperature?

If your body temperature drops, the substrate (the particles that link to the enzyme so that it works) moves slower in your cells because as temperature decreases, so does each individual particle's ki...

CC
4795 Views

Why are food chains rarely longer than three or four stages?

A lot of energy is lost at each level

PW
Answered by Paul W. • Biology tutor
4067 Views

Define 'biomass'

The dry mass of an organism

PW
Answered by Paul W. • Biology tutor
4752 Views

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