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Describe how mRNA is produced in the nucleus of a cell

Production of mRNA is called Transcription, which can be divided into 3 stages: Initiation, Elongation and Termination.Initiation: DNA Helicase (Enzyme) binds to a promoter region of DNA (a short section of ...
GK
Answered by George K. • Biology tutor
7752 Views

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
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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
6003 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
3248 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
28300 Views