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How do vaccinations work?

People are immunised against pathogens through vaccination - usually an injection.

A vaccine is comprised of dead, inactive or weakened...

Answered by Rachael O. • Biology tutor

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The surface run-off of nitrate from agricultural fertiliser into freshwater ponds and lakes can cause the death of the fish. Explain how this happens.

This question crops up a lot and may be up to a five mark question, if you learn the key points and terms you can be confident of getting all the marks you can here!

First of all,

Answered by Sarah M. • Biology tutor

4888 Views

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...

Answered by Laureen J. • Biology tutor

5208 Views

Why is the genetic code described as being universal?

The genetic code refers to DNA, which is like a blueprint that can be found in all living organisms. DNA is made up of 4 nucletotides: Adenine (A), Thymine (T), Guanine (G) Cytosine (C), whether in a b...

Answered by Laureen J. • Biology tutor

31875 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 ...

Answered by Joe D. • Biology tutor

22792 Views