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AS Biology P1 MCQs Preparation Thread

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paper 1 biology is horrible ! i lose so much marks in it and idk wut to do ! no matter how much i practice
 
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if cholestrol makes cell surface membrane more fluid than what component of membrane reduces its fluidity
 
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Ohh, I get it! You see on this diagram where the arrow points to 'hinge region'? Just draw a lines thru the solid bonds nest to the dotted hinge region. The molecule is now broken down to three fragments, and there are still two variable regions where the antigen can bind. I know my explanation's childish, but I hope it helps :)
ab3.gif

thankyouuu bt where r dose 2 variable regions?
 
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All you have to do is to find the GGP of the tertiary consumer ( fourth trophic level) which is not shown here. First calculate the GGP for 2nd TL 23000- 8000 = 15000. Then calculate GGP for 3rd TL 15000 - 10500 = 4500. Then calculate GPP for 4rth TL 4500 - 4200 = 300. Now calculate the percentage 300/23000 x 100 = 1.3. Hope that was helpful :)
 
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