- Messages
- 23
- Reaction score
- 32
- Points
- 13
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June 2012 (v2)
Q10) It must be Reducing sugar. ANS IS B. Sucrose is Non -reducing.
Q27) Ans is D.. All 4 of them are found In Blood plasma, so They r also present in Tissue fluid and lymph (because these r made from Leaked blood plasma)
Nov 2012 (v2)
Q1)Greastest number of cells mean Least Magnification which is with A (5*10=50)
Q17) The process which move subtances Down the conc. Gradient (i.e From High Conc to Low Conc) result in Equilibrium.
Those are 2 , 3 and 4. So ans is D.
Q15)A, B AND C are related With phoospho lipids. But Option D is Related to Glycolipids which act as receptor (these r not Phospholipids)
Q24) Ans is A.
Option 3 :- Apoplast way never involves cell surface membranes so it is wrong. Only Option without 3 is A .
Q34)(C) First Look at Oxygen Used up .. which is 19-12.5=6.5 cm^3 This is Per 100 cm^3
Wee need to find out in 5 dm^3 = 5000 cm^3
6.5 : 100
X : 5000
X= 325 cm^3.
Nov 2012 (v2)
Q38) (c) iF x decreased so the primary producer Increased causing the Empty Circle to Increase ( bcz they have more food) This inturn Increased B and C.
But B also increased A so No change it overall population of B. C is top Carnivore so they remained Most!
Q21)B it says Two strands... Gene is One strand Only! so its B rest of them are correct!
Q30) It says Mucus is increased which causes More exocytosis in Goblet cell So option 2 is wrong. Only Ans without 2 is B.
Q36) I m Confused Between A and C. I would rather go with C (firstly Mark scheme says So) and Secondly Parasite lives in liver and RBC so vaccine don't Reach there.
A says Many stages but doesnt Explain the change in Antigen In every stage .
Q39) It says energy used For Photosynthesis. so it would be total Energy ( Net + energy lost) Because Energy which was lost was made by photosynthesis.
So (27 000 + 3 000/1*10^6) * 100 = 3.00% ans is D
Hope i Helped
You Are welcome.. If any Doubt Feel Free to AskThanks A bunch and of course no doubt this really helped me
please can someone explain question 22 from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_qp_11.pdf
and question 22 and 19 from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_qp_12.pdf
what is the difference between base pairs and nucleotides.
please answer as soon as possible. thanks in advance
thnx can u please explain the questions as well ?Bases are a part of nucleotides. Every nucleotide has a pentose sugar, a phosphate group and one of the four bases Adenine, thymine/uracil, guanine and cytosine.
p11please can someone explain question 22 from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_qp_11.pdf
and question 22 and 19 from: papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s13_qp_12.pdf
what is the difference between base pairs and nucleotides.
please answer as soon as possible. thanks in advance
Somebody explain ths question plz
p11
q22>
DNA have 700 base pairs as mentioned in qp
we know that A pairs with T by 2 hydrogen bonds and C pairs with G by 3 hydrogen bonds
he mentioned maximum number of hydrogen bonds, so assume that DNA have only C-G
so....
3*700=2100 hydrogen bonds ... answer is D
p12
q19>
telomers are located at the end of chromosome to protect the ends from being damaged by fusing with the next chromosome.
in the qp, substance X is same as telomers, so cells divide continually without any damage of chromosomes , but without it, chromosomes are damaged so
cell division eventually slows and stops, answer is A
q22> answered above...
my pleasurethnx but the question 22 in p12 is not regarding nucleotides not base pairs. can u explain the diference?
Q18) (A)
p> atrial systole> when both atria contractsProfessor karim plzz explain
thnxmy pleasure
q22> DNA double strand structure consists of sense strand that carries all info. in a DNA and anti-sense strand that is complementary only to the sense strand to stabilise the DNA molecule
so 700/2=350 as only one strand is carrying info.
350*3=1050 as we assume that DNA molecule contains only C-G base pairs because maximum number of hydrogen bonds is needed
answer is C
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