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Biology

A Level

How do phospholipids form membranes?

Phospholipids are a major component of cell membranes. They are ideal components of membranes due to their structure. They consist of a glycerol and phosphate 'head' attached to t...

Answered by Lauren E. • Biology tutor

17033 Views

How does increasing temperature affect the rate of a reaction in the presence of an enzyme.
Initially increasing temperature will increase the rate of reaction. This is because the substrate molecules have greater kinetic energy so there are more frequent collisions with the enzyme/other molecul...
CR
Answered by Cameron R. • Biology tutor
2718 Views

Describe the cardiac cycle, including the role that valves and pressure differences play in this process.
The cardiac cycle can be split into 2 main parts- diastole (relaxation) and systole (contraction). These can be further split into 4 main phases (atrial systole
HW
Answered by Harvey W. • Biology tutor
4255 Views
Describe the process of transcription
Transcription is the first step in gene expression that copies a DNA molecule into an RNA molecule (transcript). Such RNA molecules can either be mRNAs, if the gene that is transcribed is protein coding, ...
MP
Answered by Marija P. • Biology tutor
4385 Views
Give two similarities and two differences between the structure of starch and cellulose polysaccharides (4 marks).
Similarities (up to 2 marks, 1 mark each): Both linked by glucose monomers. Monosaccharides are linked by 1,4 glycosidic bonds. Monosaccharides are joined together via condensation reactions. Both polysac...
JD
Answered by Jacob D. • Biology tutor
62544 Views
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Top answers

How do phospholipids form membranes?

How does increasing temperature affect the rate of a reaction in the presence of an enzyme.

Describe the cardiac cycle, including the role that valves and pressure differences play in this process.

Describe the process of transcription

Give two similarities and two differences between the structure of starch and cellulose polysaccharides (4 marks).

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