ALL CIE BIOLOGY DOUBTS HERE !!!

[NidZ- Hero]

I have couple to ask For p1

What substances dissolve phospholipids

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_w07_qp_1.pdf
Question 14 ,22 ,29 ,35



THANKS

[Amelia]

35 - Antibiotics cure bacterial diseases. Cholera and Tuberculosis. So, ans is A.

29 -  Systolic blood pressure represents the maximum pressure exerted when the heart contracts. So, its C.

22) - complementary base pairing along some of its length
  - an area that can attach to a ribosome
   -a site to which a specific amino acid attaches

All describing tRNA. Ans, D.

14) - A. http://ccnmtl.columbia.edu/projects/biology/lecture7/images/ncinhgra.jpg


 - Lipids can be dissolved with the use of organic solvents like alcohol.

[**RoRo**]

Can anyone please explain to me how do you go about Q22, the answer is B.
http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_w10_qp_11.pdf

& explanation for Q 17, 30 and 34 of this paper:
http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_s06_qp_1.pdf

as well as Q14 & 18 in June 2002 and Q26 & 32 in Nov 2002 [I can't find online links for both these papers, sorry]

Thanks!

[Aadeez || Zafar]

22) if u would look closely then % of nitrogenous base of A--D and B--C would be (almost) equal so this tells that A--D is a pair and B--C is another pair,

now look at Uracil when the uracils is present , C is nil then this shows that C is Thymine and as C is paired with B, B is Adanine

17) i m confused too but i think the A is correct as C and D sound senseless as water would entre cell so the water potentail of cell would increas (more +Ve) and water poteintial of solution decreases (more -ve) and the solute potential would also increase with water potential as

water potenial in plant cell = pressue potenital + solute potenial

and thus to increase water potential (as the cylinder are diipped in solution with lessesr conce. (more water potenital) the pressure potenitial and solute potential should be increased

HOPE i m not confusing u

30)
i think it has to be C (not sure)
as
the ans = (2-1)+(4-3)

34)
HIV/AIDS caused by virus, malaria by parasites and TB by Bacteria
so , virus dont respire and dnot have ribosomes, Parasites dont have surface membrane

so the ans is D

[**RoRo**]

22) if u would look closely then % of nitrogenous base of A--D and B--C would be (almost) equal so this tells that A--D is a pair and B--C is another pair,

now look at Uracil when the uracils is present , C is nil then this shows that C is Thymine and as C is paired with B, B is Adanine

17) i m confused too but i think the A is correct as C and D sound senseless as water would entre cell so the water potentail of cell would increas (more +Ve) and water poteintial of solution decreases (more -ve) and the solute potential would also increase with water potential as

water potenial in plant cell = pressue potenital + solute potenial

and thus to increase water potential (as the cylinder are diipped in solution with lessesr conce. (more water potenital) the pressure potenitial and solute potential should be increased

HOPE i m not confusing u

30)
i think it has to be C (not sure)
as
the ans = (2-1)+(4-3)

34)
HIV/AIDS caused by virus, malaria by parasites and TB by Bacteria
so , virus dont respire and dnot have ribosomes, Parasites dont have surface membrane

so the ans is D

Thank you, and your answers are right By the way! xD

[Aadeez || Zafar]

Yeh toh hamara kaam hein

[**RoRo**]

Can someone please explain the following?

November 2006 - Q11 and 19
June 2005 - Q5
November 2004 - Q27, 30 and 38
June 2004 - Q32
November 2002 - Q26 and 32
June 2002 - Q 14 and 18

Thank you! 

[NidZ- Hero]

Can someone please explain the following?

November 2006 - Q11 and 19
June 2005 - Q5
November 2004 - Q27, 30 and 38
June 2004 - Q32
November 2002 - Q26 and 32
June 2002 - Q 14 and 18

Thank you! 

November 2006
 Q11-ans A
Hot Water is less denser Than Cold water Cuz of that It brings the Dissolved nutrients to the surface
And Also water is  called A universal Solvent it dissolve most of the Substance
 Q29-ans B
Air pressure is much less as the alttitude increase thus the Partial pressure of Oxygen Decrease
Saturation of haemoglobin will be less (%)
So Less oxygen carried around the body Which Cause sickness

June 2005 - Q5- ans C
 0.25 mol dm^–3 sucrose solution in order to maintain the organelles osmotic integrity.  The respiratory substrate used by mitochondria is glucose, not sucrose.

November 2004 - Q38
Used for growth + used for other life process + respiratory heat losses( But this hw yu get the answers but i m nt sure y)

June 2004 - Q32 ans D
diffuses through the squamous epithelial cells of the alveolar wall and then through the endothelial cells of
the capillary wall or they failed to understand that the oxygen crosses two cell surface membranes as it
diffuses into and then out of each cell.  The fifth membrane is, the surface of the red blood cell. 

June 2002 -
Q 14 ans B
The substrate concentration is high the And the is nt free for the enzymes so the substrate molecules Wait for their turn

Q18 Ans C

[Amelia]

A farmer wants to encourage the beneficial bacterial reactions involved in the nitrogen cycle in wheat fields. How can he do this?

A adding artificial nitrate fertiliser
B draining waterlogged fields
C growing the same crop every year
D irrigating fields

Okay, now I think the most likely answer is B. Draining waterlogged soils will discourage the reaction of denitrifying  bacteria in the soil. Dentrifying bacteria reduce soil fertility by converting nitrates to atmospheric nitrogen. Not so beneficial for the wheat fields.

[NidZ- Hero]

A farmer wants to encourage the beneficial bacterial reactions involved in the nitrogen cycle in wheat fields. How can he do this?

A adding artificial nitrate fertiliser
B draining waterlogged fields
C growing the same crop every year
D irrigating fields

Is the answer D

[**RoRo**]

November 2006
 Q11-ans A
Hot Water is less denser Than Cold water Cuz of that It brings the Dissolved nutrients to the surface
And Also water is  called A universal Solvent it dissolve most of the Substance
 Q29-ans B
Air pressure is much less as the alttitude increase thus the Partial pressure of Oxygen Decrease
Saturation of haemoglobin will be less (%)
So Less oxygen carried around the body Which Cause sickness

June 2005 - Q5- ans C
 0.25 mol dm^–3 sucrose solution in order to maintain the organelles osmotic integrity.  The respiratory substrate used by mitochondria is glucose, not sucrose.

November 2004 - Q38
Used for growth + used for other life process + respiratory heat losses( But this hw yu get the answers but i m nt sure y)

June 2004 - Q32 ans D
diffuses through the squamous epithelial cells of the alveolar wall and then through the endothelial cells of
the capillary wall or they failed to understand that the oxygen crosses two cell surface membranes as it
diffuses into and then out of each cell.  The fifth membrane is, the surface of the red blood cell. 

June 2002 -
Q 14 ans B
The substrate concentration is high the And the is nt free for the enzymes so the substrate molecules Wait for their turn

Q18 Ans C

Thank you very much, I saw this today in the morning before heading to school

[curiousguy]

After 2days i am having a class test on water and carbohydrates. Please post as many typical questions along with answers that i may get in common. wud appreciate any help(__)

[tulsi182]

how to remember/memrise details ..
better option than muggin?

[Amelia]

how to remember/memrise details ..
better option than muggin?

Biology wont require 'mugging-up' if you understand the concepts clearly.

After 2days i am having a class test on water and carbohydrates. Please post as many typical questions along with answers that i may get in common. wud appreciate any help(__)

It's a class test, so ofcourse we cant 'predict' the questions. However, I have attached a document of related questions. If you find difficulty in answering any of the questions; either post your doubts here.... or google search the answers. 
Good Luck!

[$H00t!N& $t@r]

How can I get the uncertainty in the measurement of the actual thickness of a leaf lamina? Please help me out...