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Describe how phagocytosis of a virus leads to the secretion of an antibody against this virus antigen.

Phagosome/vesicle fuses with lysosome;(Virus) destroyed by lysozymes/hydrolytic enzymes;Peptides/antigen (from virus) are displayed on the cell membraneHelper T cell/TH cell binds to the antigen (on the anti...
VG
Answered by Victoria G. • Biology tutor
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Suggest and explain two ways the cell-surface membranes of the cells lining the intestine may be adapted to allow rapid transport of nutrient

Membrane has increased/large surface area for (fast) diffusion/facilitated diffusion/active transport/co-transport;Large number of protein channels/carriers (in membrane) for facilitated diffusion;Large numb...
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Answered by Victoria G. • Biology tutor
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How does the body control blood sugar

In order to maintain homeostasis, which in this case means a stable blood glucose, certain hormones must be released in situations which alter blood glucose. This occurs most commonly after a meal (increase)...
GW
Answered by Georgie W. • Biology tutor
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If someone has blood type A+: which are his possible genotypes and who can he donate blood to?

The ABO blood type system relies upon the co-dominant alleles I A and I B , which are expressed any time they are present and are dominant over i which is recessive. If someone has blood type A, that means i...
FT
Answered by Francisco T. • Biology tutor
55735 Views

Describe how the small intestine is adapted for efficient glucose absorption. (3 marks)

The small intestine has a very large surface area to increase the amount of area that glucose can diffuse out of the small intestine into the bloodstream. The large surface area is created by villi, which ar...
MH
Answered by Morgan H. • Biology tutor
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