Top answers

Describe and explain the effects of non-optimal pH and temperature on enzyme activity.

Enzymes at the wrong pH experience changes in the charge of the molecule, this can cause impacts on hydrogen and iconic bonds. Enzymes become denatured as terry structure is lost and the active site is no lo...
DW
Answered by Daisy W. • Biology tutor
6458 Views

How are the lungs adapted to increase the rate of diffusion? 3 Marks

Increase in surface area, which is provided by the many alveoli that are located at the end of the bronchioles. These can number in the thousands. The alveoli have a thin wall, one cell thick, so diffusion c...
LC
Answered by Louise C. • Biology tutor
6088 Views

Why do cells divide? Why not simply get bigger?

- Larger cell have smaller SA:Vol Ratio- Difficulty in exchange materials- Multicellular more efficient- Revisit – transfusion, osmosis, active transport
WW
Answered by William W. • Biology tutor
3339 Views

Describe and explain the function of the loop of henle and suggest how its structure may differ in organisms adapted to a desiccated environment.

The loop of henle is a region of the kidney's nephrons which through active and passive transport of Na+ and Cl- ions lowers the water potential of the kidney's medulla, allowing greater reabsorbtion of wate...
TH
Answered by Theo H. • Biology tutor
28449 Views

What's the definition of osmosis?

Osmosis is the net movement of water from an area of high water potential to an area of lower water potential through a partially permeable membrane.An area of high water potential means there is less solute...
EJ
Answered by Emily J. • Biology tutor
4028 Views