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A level Biology: Post your doubts here!

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Pls explain me 11
Look, it's pretty simple....the question said that one amino acid was altered and when you're talking about amino acids this means that they're talking about the primary structure..
Anyways, the primary structure is the base for proteins, so if anything happens to this base, it'll affect everything else. In this case, a change in the 1ry structure will result in a change in 2ry, tertiary, and the quaternary structure as well. That's why answer is C.
 
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D since pressure decreases from capillary to vein and veins have lower thickess than arteries but more than capillaries. Although i dont get the velocity one graph :p
D is correct velocity of blood decreases in cappillaries for efficient exchange of substances btw cappillary and cell
 
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For Q 15,this was indeed tricky.a\As the readings were only taken every ten degrees, the rate could then reach the maximum between the measurements. This could mean between 30°C and 40°C or between 40°C and 50°C for this data.
 
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