Top answers

Breifly describe the cohesion-tension theory in plants?

Water evaporates from the cells and leaves the plant once the stomata open, This creates a suction which pulls more water into the leaf As water is cohesive due to hydrogen bonds, when one molecule moves oth...
BQ
Answered by Brendan Q. • Biology tutor
31321 Views

Describe how giving a vaccine leads to production of antibodies against a virus

A vaccine is a weakened or dead form of a virus that contains the antigen of that virus. An antigen is a protein on the surface of the virus that allows the body to identify it. Specific T helper cells from ...
OT
Answered by Olivia T. • Biology tutor
9078 Views

How do organisms adapt?

Organisms do not adapt much over their lives, but in a large population there will be many different individuals. Some taller, some shorter, some may have a longer beak or a slightly different colour pattern...
TK
Answered by Tomas K. • Biology tutor
3150 Views

In what circumstances and how do humans anaerobically respire?

During strenuous activities such as exercising, the consumption of oxygen is greater than it's supply. As Oxygen is the final acceptor of electrons in the electron transport chain, without Oxygen the chain c...
AA
Answered by Arash A. • Biology tutor
3208 Views

Messenger RNA (mRNA) is used during translation to form polypeptides. Describe how mRNA is produced in the nucleus of the cell. (6 marks)

This process is called transcription . In the nucleus, an enzyme helicase is used to break the hydrogen bonds between the two strands of the double helix. Only one DNA strand is used the template, which we c...
KP
Answered by Kirstin P. • Biology tutor
3995 Views