Top answers

Describe how the lungs are adapted for gas exchange (6 marks)

-There are a large number of alveoli , increasing the surface area available for gas exchange. The alveoli have many infoldings , further increasing the surface area. - The walls of the alveoli are thin , th...
AA
Answered by Anna A. • Biology tutor
48717 Views

Describe and explain how temperature affects the rate of an enzyme-controlled reaction?

Up to the optimum temperature (around 37 degrees Celsius) kinetic energy increases. So the likelihood of successful collisions between the active site of the enzyme and substrate increases. More enzyme subst...
EF
Answered by Enya F. • Biology tutor
6143 Views

Outline the process of ATP generation by chemiosmosis.

This is a process that occurs on the membrane of the mitochondria. Here the electrons are passed from one electron carrier to the next in a chain know as the electron transport chain. With each carrier being...
AJ
Answered by Anushri J. • Biology tutor
4687 Views

Can you explain the four levels of protein folding?

Proteins form from basic structures and fold into larger, more complex ones. They start as simple chains of amino acids, this is known as the primary structure of a protein. They then fold into secondary str...
CC
Answered by Caitlin C. • Biology tutor
3668 Views

Compare and contrast animal and plant cells, giving 3 similarities and 3 differences. Answer can be given as an annotated diagram.

Similarities:Have a cell membraneHave a nucleusHave mitochondriaDifferences:Plant cell has a cell wallPlant cell has one big vacuolePlant cells have chloroplasts - those in the leaves
KU
Answered by Kipras U. • Biology tutor
1901 Views