AS Biology P1 MCQs Preparation Thread

[kiran11]

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

very helpful! i also had a problem with this question. thank u!!

 

[HubbaBubba]

Yea so each small divison has a large divison in the middle doesnt it ?
My method worked for other questsion like this but not for this

You can find a site which explains it very clearly if you google calibration, but when the question says each division, they literally mean 'every division'

 

[Pwincessajwa]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s11_qp_12.pdf q1,610,15,16 plzzz help me ????

 

[HubbaBubba]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s11_qp_12.pdf q1,610,15,16 plzzz help me ????

q1 - They pretty much calibrated it for you. If one EPG unit is 0.005mm, then 3.5 units are (0.005 * 3.5) 0.0175mm which is 17.5 micrometers. C is the answer.

q10 - Only peptide bonds are formed between amino acids in the primary structure. Any other bonds are formed later in the secondary, tertiary, and Quaternary structures. D is correct.

q15 - Everything except for the carbohydrate chain has hydrophobic and hydrophillic regions. The inside of the transport protein is hydrophillic, while the outer part is hydrophobic. Cholesterol and proteins also have it. Usually the hydrophobic bit, is inside the bi layer while the hydrophillic part faces outwards. C is right.

q16 - You need to know that saturated hydrocarbons in the hydrophobic tails of the phospholipid make the membrane more rigid, while unsaturated hydrocarbons make it more fluid. C is the right answer

 

[SalmaXXXX]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s11_qp_12.pdf q1,610,15,16 plzzz help me ????

Q1 ) the diameter of cell = the measure in eye piece graticule x 0.005 = 0.0175 mm x 1000 = 17.5 micrometre. which is approximately 18 micromtre.
Q6 ) Amylopectin and glycogen are the only branched chains we have in the syllabus. No glycogen is here, so the branched is amylopectin B, and cellulose is not branched.
Q 10) Peptide bond only. Hydrogen bonds occur between the R groups containing -COOH and _NH2, disulphide bond occurs between amino acids whose R groups contain S. S here is not in the R group so the only bond is peptide
Q15) All the components have both hydrophilic region which is facing the medium and hydrophobic region facing each other except glycoproteins and glycolipids since they only only face the water so are only hydrophilic.
Q16) double bonds in fatty acid chains makes "kinks" which increases the gap between phospholipids thus increasing the fluidity.
Hope I helped

 

[Alicee]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w12_qp_12.pdf
12, 23, 33,34 and 39! pleeease explain

 

[1357911]

O/N/12 varient 11 q-33 and q-36can anybody help?

 

[1357911]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf
12, 23, 33,34 and 39! pleeease explain

q-12
Its something that u have to learn, Tertiary and quartanary structures only contain hudrogen,disulphide,ionic bonds and hydrophobic interactions.
q-23
Look at the amino acid sequence. There are two amino acids of the same type. (leu).However if u look at the other options they are also correct, but they are only asking about the triplet code.

 

[Alicee]

q-12
Its something that u have to learn, Tertiary and quartanary structures only contain hudrogen,disulphide,ionic bonds and hydrophobic interactions.
q-23
Look at the amino acid sequence. There are two amino acids of the same type. (leu).However if u look at the other options they are also correct, but they are only asking about the triplet code.

no peptide bond? i thought all protien had them!!
what about the oders?
n thanks!!

 

[1357911]

no peptide bond? i thought all protien had them!!
what about the oders?
n thanks!!

And no tertiary and quarternary structures do not contain peptide bonds

Im sorry but which orders are u talking about

 

[Pwincessajwa]

Q1 ) the diameter of cell = the measure in eye piece graticule x 0.005 = 0.0175 mm x 1000 = 17.5 micrometre. which is approximately 18 micromtre.
Q6 ) Amylopectin and glycogen are the only branched chains we have in the syllabus. No glycogen is here, so the branched is amylopectin B, and cellulose is not branched.
Q 10) Peptide bond only. Hydrogen bonds occur between the R groups containing -COOH and _NH2, disulphide bond occurs between amino acids whose R groups contain S. S here is not in the R group so the only bond is peptide
Q15) All the components have both hydrophilic region which is facing the medium and hydrophobic region facing each other except glycoproteins and glycolipids since they only only face the water so are only hydrophilic.
Q16) double bonds in fatty acid chains makes "kinks" which increases the gap between phospholipids thus increasing the fluidity.
Hope I helped

thank u soooo muchhhhhhhhh i am gonna ask so many doubts if there is no prob with u ????

 

[SalmaXXXX]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf
12, 23, 33,34 and 39! pleeease explain

12) A primary structure doesn't contain hydrostatic bonds so option A is out. A secondary structure doesn't contain ionic bond so B is out. A quatenary structure does contain hydrogen bond so D is out. B is the correct answer, by the type of bonds found, he means the types of bond which maintain that specific structure. The peptide bond doesn't maintain the tertiary structure.

23) None of B, C , D is supported by the information given. However, it's clear that Leu amino acid has more than one triplet genetic code that codes it so option A is correcr answer.

33) Deposition of fatty materials in arteries surely can result a heart failure. But he stated in arteries AND veins. Deposition in veins plays no role thus excluding 2. The other three are correct so option D is correct answer.

39) that's easy, nitrification takes place whether from ammonium to nitirites or from nitrites to nitrates so option C is corect.

 

[1357911]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf
12, 23, 33,34 and 39! pleeease explain

questions 33 and 34,Im a little confused. regarding quention 39 i think u know that nitrification is when the nitrites are changed to nitrates. so the answer is obviously C

 

[Alicee]

And no tertiary and quarternary structures do not contain peptide bonds

Im sorry but which orders are u talking about

ah! okay! got it thanks!

someone please explain dese!!!
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf
33,34 and 39!

 

[Alicee]

12) A primary structure doesn't contain hydrostatic bonds so option A is out. A secondary structure doesn't contain ionic bond so B is out. A quatenary structure does contain hydrogen bond so D is out. B is the correct answer, by the type of bonds found, he means the types of bond which maintain that specific structure. The peptide bond doesn't maintain the tertiary structure.

23) None of B, C , D is supported by the information given. However, it's clear that Leu amino acid has more than one triplet genetic code that codes it so option A is correcr answer.

33) Deposition of fatty materials in arteries surely can result a heart failure. But he stated in arteries AND veins. Deposition in veins plays no role thus excluding 2. The other three are correct so option D is correct answer.

39) that's easy, nitrification takes place whether from ammonium to nitirites or from nitrites to nitrates so option C is corect.

thanks!

in 39 what is the process B?

 

[1357911]

o/n 2012 varient 11 q-33,36,and 40......... SOMEBODY PLZZ HELP

 

[SalmaXXXX]

thanks!

in 39 what is the process B?

This is denitrification, changing nitrates to Nitrogen gas.

 

[1357911]

which disease is treated with drugs that have a similar molecular structure to DNA molecule?
A cholera
B HIV AIDS
C malaria
D tuberculosis

 

[SalmaXXXX]

o/n 2012 varient 11 q-33,36,and 40......... SOMEBODY PLZZ HELP

In 33, if you took a look at option D, it states that the decrease is by 60% when in the graph, it barely passes the 45% ( from 80% to 35%).
In 36, since the T lymphocytes is produced from stem cells in the Bone marrow, then the problem lies there and it has to be transplanted. We don't need antibodies transfusion since they are broken down rapidly in the body neither do we need vaccination against all the diseases because even then cytokineses is not present and production of antibodies won't be activated.

In 40, i have explained that in an earlier post, just flip through them here

 

[SalmaXXXX]

which disease is treated with drugs that have a similar molecular structure to DNA molecule?
A cholera
B HIV AIDS
C malaria
D tuberculosis

HIV and the drug is called zidovudine.