Search our library of Biology A Level questions

Top answers

Biology

A Level

Describe the structural differences between arteries, veins and capillaries and link to their function

Arteries - Small lumen, large amount of smooth muscleSmall lumen provides increased blood pressure for blood to flow all across body - smooth muscle provides necessary force to push blood across body

Answered by Muhammad S. • Biology tutor

2030 Views

Explain how gametes are produced by the process of meiosis.

Meiosis to produce gametes is a process that requires two cell divisions. Before the first division, the cell's Chromosomes are replicated as they do in mitosis to create sister chromatids for each chromo...

Answered by Henry H. • Biology tutor

5448 Views

Explain why an artery may be described as an organ.

Tissues are defined as being a collection of different types of cell.Similarly, organs are defined are being a collection of tissues, wh...

Answered by Matt S. • Biology tutor

31843 Views

Explain why haemoglobin in Sickle Cell Anaemia is less effective at carrying oxygen.

The mutation present in sickle cell anaemia causes a change in the primary structure of amino acids in the haemoglobin molecule. This change in primary structure changes the tertiary structure of a haemog...

Answered by Kit T. • Biology tutor

2270 Views

What are the different types of RNA used for during translation?

Translation occurs at the ribosomes (which may be attached to endoplasmic reticulum). The ribosomes themselves are made of rRNA.mRNA carries the code for the polypeptide as it is complimentary to a strand...

Answered by Roshni M. • Biology tutor

2272 Views