Top answers

What makes the structure of Haemoglobin good for the transport of oxygen to tissues? (3 marks)

Haemoglobin (Hb) is comprised of 4 polypeptide chains (2 alpha, 2 beta). Each polypeptide chain has a prosthetic group capable of picking up oxygen, therefore one Hb molecule can transport 4 oxygen molecules...
NL
4383 Views

Briefly describe the processes of ultrafiltration and selective reabsorption in the nephron

Ultrafiltration, the first stage of urine formation, begins when blood enters the glomerulus via the afferent arteriole. Water, glucose, ions and amino acids leave the blood and enter the bowman’s capsule. T...
KF
15456 Views

What is the mechanism which leads to an increase in heart rate during exercise?

Exercise leads to an increase of CO2 in the blood. This lowers pH as the CO2 binds with water to form carbonic acid. This pH change is measured by chemo-receptors in the carotid arteries. This change then si...
MB
3713 Views

How can you work out the chance of a child getting a genetic disease from a family tree?

This is really more of a puzzle than biology. You work this out the same way, no matter how big the tree is. First you need to figure out if the chromosome of the disorder is autosomal or sex-linked. If it m...
NW
3413 Views

Describe three ways of synthesising DNA fragments and how they are amplified:

I would ask the tutee when considering an answer to divide the question in two to ensure not one part of it is overlooked but give the answer as a whole.Part 1 Conversion of mRNA into cDNA using reverse tran...
BG
Answered by Ben G. • Human Biology tutor
3538 Views