Search our library of Biology GCSE questions

Top answers

Biology

GCSE

What is Mitosis? Compare to Meiosis.

Mitosis is the division of diploid (full set of 46 chromosomes) cells, to form two diploid daughter cells with an identical nature to their parent cells. This occurs throughout the body during cell repla...

Answered by Benn C. • Biology tutor

3737 Views

What variables affect the rate of diffusion?

There are five main features that effect the rate of diffusion:

The rate of diffusion INCREASES if there is a short diffusion path because there is less chance of collision of particles.

The...

Answered by Charlotte W. • Biology tutor

14406 Views

Emphysema is a disease affecting the lungs. People with emphysema are often short of breath and find exercise difficult. Explain what happens to the lungs in this disease to cause the symptoms mentioned.

Emphysema affects the structure of the lungs called the alveoli. Each healthy alveolus has a large surface area in order for maximum diffusion of oxygen in the lungs.

If someone is affected by emph...

Answered by Elodie L. • Biology tutor

17389 Views

Why does cholesterol need to be reduced and how do statins do this?

-High levels of cholesterol (especially LDL's, the 'bad' type) clog the arteries with a thick fatty substance

-This causes narrowing of the coronary arteries (which carry blood to the heart)

Answered by Isobel P. • Biology tutor

2742 Views

Identify 3 different antibiotics and describe how they work.

Antibiotics are important for treating bacterial infections that may be making us ill. There are many different antibiotics that work in different ways, and therefore they are suitable for treating differ...

Answered by Madeleine H. • Biology tutor

3300 Views