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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
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Outline the role of insulin and glucagon in the regulation of glucose and outline type 1 and type 2 diabetes.

Relevance: Body needs to make glucose for ATP production. (Energy production)Regulation:Both hormones insulin and glucagon are released from the islets of Langerhan in the pancreas.Insulin: Released from the...
SK
Answered by Shantanu K. • Biology tutor
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State the cell theory and briefly describe 3 exceptions.

The cell theory states that:All living organisms are composed of cells (unicellular or multicellular)The cell is the smallest unit of lifeAll cells come from the division of pre-existing cellsExceptions:Skel...
KP
Answered by KYRIAKI P. • Biology tutor
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Explain how a nerve impulse passes along a neuron (8 marks)

Neurons transmit electrical impulses. Electrical impulses are action potentials propagated along the axons of neurons from one end to another. At a resting potential , sodium-potassium pumps pump out 3Na+ fo...
JW
Answered by Jessica W. • Biology tutor
22011 Views

Explain the role of enzymes in the process of DNA replication in prokaryotes

A variety of enzymes are involved in the process of DNA replication. For replication to occur each strand of DNA must be separated from the other, a result of its double helix structure and the hydrogen bond...
HJ
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