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Biology
A Level

Describe how mRNA is produced in the nucleus of a cell (6 marks)

First, read the question carefully. It asks us to ‘Describe how mRNA is produced’, a good way to approach this is to go through the process step by step. Notice that the question is worth...

KW
Answered by Katie W. Biology tutor
25277 Views

How does respiration happen in cells?

Respiration is the process which cells use to produce energy and happens in the mitochondria of the cells. Almost every cell carries out respiration. There are 4 main stages to respiration - glycolysis, t...

OJ
Answered by Olive J. Biology tutor
3649 Views

Explain the concept of 'threshold potential' in the initiation of an action potential

Action potentials are only initiated when depolarization above a certain level occurs, this level is known as the 'threshold potential'. 'Vm' is the resting membrane potential (voltage) and the depolarizi...

TD
12333 Views

Explain the role of B-lymphocytes and T-lymphocytes in the defence of the body against a virus infection (6 Marks)

A virus is a pathogen which contains antigens on its cell surface. These antigens are detected and digested by macrophages. The two pathways involved in the detected and elimination of the virus is the ce...

SR
Answered by Sumaiya R. Biology tutor
6143 Views

state 3 difference between DNA replication and transcription of DNA

DNA to DNA vs DNA to RNA cell division vs gene expression origin of replication vs promoter sequence

SK
Answered by Shobiga K. Biology tutor
3089 Views

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