Top answers

Explain how changes in temperature and pH affect the rate of an enzyme-catalysed reaction. Give appropriate diagrams to illustrate your answer. [6]

At the optimum temperature for a given enzyme (specific to each enzyme dependent on the composition of the protein), catalytic activity is at a maximum and hence the reaction proceeds at maximum rate. Both e...
JL
Answered by Jasper L. • Biology tutor
4590 Views

what is water potential?

Water potential is a measure of the tendency of water to move from one place or compartment to another. Water moves based on the water potential, from a region of higher water potential to a region of lower ...
VG
Answered by Verity G. • Biology tutor
4364 Views

Explain the differences between the lock-and-key mechanism of enzyme action and the induced fit model

The lock-and-key mechanism of enzyme activation involves the active site of the enzyme fitting perfectly with the substrate molecule and the subsequent reaction being catalysed biologically. However, the ind...
CO
Answered by Caitlin O. • Biology tutor
9204 Views

How can a mutation in a sequence of DNA affect the function of a protein?

Firstly, it is important to recap how DNA codes for synthesis of proteins. mRNA is formed from complementary base pairing to the template strand of DNA in a process called transcription. Every 3 bases within...
BL
Answered by Ben L. • Biology tutor
32372 Views

Describe how the resting potential is maintained in a neurone, and what this resting potential value is.

The resting potential of a neurone is -70 mV, which means that it's more negative in the cytoplasm than in the tissue fluid. In the membrane there are sodium-potassium pumps which work using active transport...
AE
21304 Views