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Biology
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Describe what an enzyme is and explain how it works

An enzyme is a biological catalyst which can speed up the rate of chemical reactions, it is also a protein that can be reused.
The lock and key model explains how an enzyme works to catalyse reactio...

ST
Answered by Sadie T. Biology tutor
2348 Views

What are the differences and similarities between osmosis, active transport and diffusion?

Osmosis is a term used to describe the movement of water molecules from a high water potential to a low water potential. Diffusion is similar to this, however it is used to describe the movement of molecu...

JC
Answered by Joshua C. Biology tutor
7777 Views

What is the structure of an animal cell?

The main bits of an animal cell are as follows: A nucleus - this is where the genetic material is kept for cell replication and repair Cytoplasm - this is the bit in between the other things in the cell -...

EJ
Answered by Ellen J. Biology tutor
2084 Views

What is eutrophication, and how does it happen?

This is a common topic to come up in exams, often worth many marks. Eutrophication is an ecological process which often occurs when humans are irresponsible with waste products that can end up in bodies o...

JG
Answered by Jake G. Biology tutor
2384 Views

Explain diffusion?

This is the net passive movement of molecules down the concentration gradient from an area of high concentration to an area of lower concentration, through ...

JN
Answered by Jack N. Biology tutor
2286 Views

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