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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 two fatty acid 'tails'. The t...
LE
Answered by Lauren E. • Biology tutor
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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 molecules....
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Answered by Cameron R. • Biology tutor
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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 , atrial diastole , ventricular systole , ven...
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Answered by Harvey W. • Biology tutor
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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, or ...
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Answered by Marija P. • Biology tutor
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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 polysaccha...
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Answered by Jacob D. • Biology tutor
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