Top answers

Explain the lock and key model of enzyme action, including how they are denatured. [6 marks]

The first step is to read the question and ensure that the student understands all of the terminology. For example, make sure the student knows what is meant by ‘explain’, ‘enzyme’, and ‘denatured’. Then the...
BH
Answered by Bryony H. • Biology tutor
13293 Views

Briefly describe how a vaccine works.

A vaccine is a dead or attenuated (weakened) form the pathogen. When injected into the host, the antigens on the surface of the pathogen generate an immune response. This stimulates the production of white b...
KP
Answered by Krishan P. • Biology tutor
4174 Views

Explain what is meant by epigenetics and how it can inhibit transcription.

Epigenetics is the process by which heritable changes in gene function are caused by environmental factors. These changes are not within the base sequence of our DNA but are in fact due to the chemical tags ...
ET
Answered by Emily T. • Biology tutor
6578 Views

What are the different types of enzymes and their roles involved in DNA replication?

The different types of enzymes include DNA polymerase which catalyses the formation of the bonds between adjacent nucleotides on each strand of the double strands. It also includes DNA ligase which is respon...
CT
Answered by Carmen T. • Biology tutor
3968 Views

What is the difference between glucose and glycogen?

Glucose is a monosaccharide, meaning that it is composed of single units. This is suitable for transport through the blood stream. Glycogen, however is a polysaccharide meaning that is composed of at least m...
SC
Answered by Samuel C. • Biology tutor
10213 Views