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Biology

A Level

Explain the functional differences between a t-RNA and an m-RNA molecule

A tRNA molecule is one which carries an amino-acid and takes it to ribosomes to be inserted into an amino-acid sequence making a protein during the translation step of protein synthesis. An mRNA molecule ...

Answered by Chintan P. • Biology tutor

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Explain the concept of 'chemiosmosis' in oxidative phosphorylation

The process of chemiosmosis essentially addresses the issue of storing chemical energy into a specific bond. The conversion from chemical energy in the coenzymes, such as NADH and FADH

Answered by Narut P. • Biology tutor

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What is eutrophication and what are its effects?

Eutrophication occurs when excess nutrients, like nitrates and phosphates, enter a body of water. These excess nutrients cause an increase in plant and algal growth in the water, often leading to an algal...

Answered by Ignatius-Roy H. • Biology tutor

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Describe how the RER is involved in the production of enzymes. [2 marks] June 2014

To attain the two marks you have to say that the RER contains ribosomes and these synthesis proteins. Enzymes are specialised proteins.

Answered by Tony A. • Biology tutor

20293 Views

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...

Answered by Katie W. • Biology tutor

28438 Views