AS Biology P1 MCQs Preparation Thread

[imperial]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w12_qp_11.pdf

explain question 40

 

[Bluejeans#]

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

thankyouuu bt where r dose 2 variable regions?

 

[Student12]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s12_qp_11.pdf
Q16(C), 39(C) HELPP ! Could someone explain?

 

[sweetjinnah]

plz help me in this mcq 1: http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_w06_qp_1.pdf
nd i hav a qts is lysosome present in plant cell??

 

[fishcook]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w12_qp_12.pdf
Q10. Can someone explain why it's C and not A?

 

[Student12]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w11_qp_12.pdf
Q5(B), 20(C) , 23(C)

Someone helppp !

 

[imperial]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf
Q10. Can someone explain why it's C and not A?

Some amino acids forms special bonds, if it's changed, then the bond which holds the normal the shape will be affected , so it will no longer have the same shape and thus secondary and tertiary shape is affected.

 

[imperial]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s12_qp_11.pdf
Q16(C), 39(C) HELPP ! Could someone explain?

16

Diffusion doesn't need energy, active transport needs energy, when the nitrogen gas is bubbled, the animal cells cannot respire so there is no energy, active transport cannot take place without energy, in the nitrogen gas graph it shows 3-carbon sugar is still absorbed but 6-carbon sugar is not.

 

[SalmaXXXX]

Could someone please explain to me these graphs? Q 14
and also how it would look if the amount of product formed on Y-axis and time on X-axis. It was a question in June 2002 but I can't find it here.

http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_w07_qp_1.pdf

 

[rockerkunal]

help pleasssssssse!!

 

[SalmaXXXX]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_11.pdf

explain question 40

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

 

[Sara syed]

explain w11qp13 q 27

 

[sweetjinnah]

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

plzzzzzzzzz ans my qts too...it is posted above....

 

[SalmaXXXX]

help pleasssssssse!!

A polypeptide chain is coded by the Exon strand of DNA, not both strands. So first you'll divide 120/2 = 60. So 60 nucleotides are coding for this chain. Since every amino acid is coded by 3 nucleotides, you'll divide 60 by 3 = 20 amino acids.

 

[SalmaXXXX]

plz help me in this mcq 1: http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w06_qp_1.pdf
nd i hav a qts is lysosome present in plant cell??

Firstly, at some stages lysosomes are present in the plant cells, when it's newly formed as far as I remember before the cell wall is formed. And which questions do you exactly want in this test

 

[Sara syed]

w11qp13 question 33 pls help

 

[rockerkunal]

A polypeptide chain is coded by the Exon strand of DNA, not both strands. So first you'll divide 120/2 = 60. So 60 nucleotides are coding for this chain. Since every amino acid is coded by 3 nucleotides, you'll divide 60 by 3 = 20 amino acids.

thanks a ton!!

 

[sweetjinnah]

Firstly, at some stages lysosomes are present in the plant cells, when it's newly formed as far as I remember before the cell wall is formed. And which questions do you exactly want in this test

nd ans mcq 1 of w o6 qp 1 plzzzzzzz

 

[imperial]

Could someone please explain to me these graphs? Q 14
and also how it would look if the amount of product formed on Y-axis and time on X-axis. It was a question in June 2002 but I can't find it here.

http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_w07_qp_1.pdf

The graph simply shows effect of increasing substrate concentration on the rate of reaction, non-competitive inhibitor doesn't let the rate of reaction reach the maximum limit, competitive inhibitor only initially decrease the rate of reaction, but the increase in substrate concentration diminish it's effect, so it will reach the maximum limit after time.

(Remember that there is no time here, I got confused by it in the beginning)

 

[Raweeha]

thankyouuu bt where r dose 2 variable regions?

The two variable regions are the green and red parts. Read your textbook