Top answers

How does concentration gradient affect the rate of diffusion?

Diffusion is the movement of a substance from areas of high concentration to areas of low concentration, down a concentration gradient. As a result of diffusion, substances may move in and out of cells, acro...
RB
Answered by Rachel B. • Biology tutor
29196 Views

What is the difference between the xylem and phloem?

The xylem and phloem are both tissues for the transportation of substances, required for normal functioning by plants. They differ in what substances they transport and how these are transported, however. Th...
EI
Answered by Emma I. • Biology tutor
6452 Views

Describe how the hormones FSH, oestrogen and LH are involved in the control of the menstrual cycle

FSH stimulates oestrogen productionoestrogen inhibits FSH and stimulates LH /LH stimulates egg release
RD
Answered by Rabia D. • Biology tutor
4453 Views

Describe the structure of DNA.

DNA (deoxyribonucleic acid) is a polymer made up of two nucleotide chains held together by hydrogen bonding between nucleotides in a double helix shape. A nucleotide is made up of a deoxyribose sugar, a base...
SB
Answered by Sim B. • Biology tutor
6822 Views

Why shouldn't you take antibiotics for a cold?

You may remember that there are broad categories of microorganisms that cause diseases, such as bacteria, viruses and fungi which all have different properties and ways of causing disease. Antibiotics are ma...
PL
Answered by Paulo L. • Biology tutor
2773 Views