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Is it true that once we reach adulthood we never produce new neurons?

The short answer is no, this is a false statemement. There are two areas in the brain which undergo adult neurogenesis after adolescence. These is the subventricular zone of the lateral ventricles, which sup...
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Answered by Ebrahim B. • Biology tutor
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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...
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Answered by Bryony H. • Biology tutor
13149 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...
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Answered by Krishan P. • Biology tutor
4094 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 ...
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Answered by Emily T. • Biology tutor
6478 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...
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Answered by Carmen T. • Biology tutor
3878 Views