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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 IA and IB, which are expressed any time they are present and are dominant over i which is recessive. If someone has bloo...

FT
Answered by Francisco T. Biology tutor
50475 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...

MH
Answered by Morgan H. Biology tutor
22341 Views

Why does propanol have a higher boiling point than propanone, propanal or methyl ethanoate?

Molecules of propanol have a hydrogen directly bonded to a NOF atom (oxygen in this case), which means that they can hydrogen bond with eachother. The oxygen in the other three molecules is only bonded to...

KW
39027 Views

To what extent was the Vietnam War the major turning point in US foreign policy between 1898 and 1991?

Between 1898 and 1991 American foreign policy encountered three major turning points: The moveto imperialism and global expansion beginning in 1898; the inward turn to isolationism following thefinancial ...

IT
Answered by Isobel T. History tutor
4425 Views

How can we calculate the maximum and minimum points of a function?

The derivative of a function in a point is, by definition, the slope of the tangent line to the function in that point. In a point that is a maximum or a minimum, one can easily picture that the tangent i...

FT
Answered by Francisco T. Maths tutor
2143 Views

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