Top answers

Draw a graph on the effect of an increase in temperature on the rate of an enzyme controlled reaction. Explain the shape of the curve and suggest why the temperature of a mammal is maintained just below the optimum temperature.

As kinetic energy increases, enzyme and substrate molecules collide with more frequency allowing more enzyme substrate complexes to be formed. With increasing temperature, the tertiary structure of the prote...
SZ
Answered by Sadia Z. • Biology tutor
7729 Views

What is epigenetic control of gene expression? How does it occur?

Strictly speaking, it is the heritable changes in the function of your genes that do not involve a change in your DNA's base sequence. Simply put, it is the way in which we regulate whether a gene is transcr...
FF
Answered by Fareema F. • Biology tutor
3276 Views

How is blood glucose concentration controlled by hormones?

The three main hormones to consider are: insulin, glucagon, and adrenaline. All three act on receptors on their target cells. Insulin results in the mobilisation of channel proteins in cell vesicles that are...
FF
Answered by Fareema F. • Biology tutor
3591 Views

What is the cAMP cascade and where does it occur?

The cAMP cascade describes an intracellular process that occurs upon activation of glucagon and adrenaline receptors. Glucagon receptors are present mainly in the liver , where they activate enzymes that con...
FF
Answered by Fareema F. • Biology tutor
10394 Views

Outline the key stages that occur in mitosis.

The initial stage of mitosis is known as prophase. In early prophase, the nuclear membrane breaks down and the nucleolus disappears. The chromatin condenses into a doubled armed chromosome- comprised of two ...
LF
Answered by Liam F. • Biology tutor
4803 Views