AS Biology P1 MCQs Preparation Thread

[1357911]

o/n 2011 qp 11:mcq 39 plzzz help..

Its B. the inorganic minerals and the energy from sunlight are never part of a food web. they always start from the producers

 

[SalmaXXXX]

I have some questions guys !

Q) 21, 22, 37 . Please?

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s12_qp_12.pdf

 

[fishcook]

Resolution means the ability to distinguish between two different points. With a resolution less than 7 nm, you won't be able to differentiate the membrane from its surroundings, you won't see it.

But you aren't seeing the membranes. Your simply looking at the lines of the cell which you can see. And which are 300nm apart

 

[SalmaXXXX]

But you aren't seeing the membranes. Your simply looking at the lines of the cell which you can see. And which are 300nm apart

You are seeing the edges of the cytoplasm, not the cell membrane.

 

[darkxangel]

I need help in this question !!

 

[Ikram Khaliq]

Which of the following can result in heart failure?
1 increase in blood pressure
2 deposits of fatty material in arteries and veins
3 reduced oxygen supply to cardiac muscle
4 increased risk of blood clotting
A 3 and 4 only
B 1, 2 and 3 only
C 1, 2 and 4 only
D 1, 3 and 4 only

 

[darkxangel]

I need help in this !

 

[imperial]

Which of the following can result in heart failure?
1 increase in blood pressure
2 deposits of fatty material in arteries and veins
3 reduced oxygen supply to cardiac muscle
4 increased risk of blood clotting
A 3 and 4 only
B 1, 2 and 3 only
C 1, 2 and 4 only
D 1, 3 and 4 only

D

 

[Ikram Khaliq]

I need help in this question !!View attachment 28948

(19-12.5)x(5000/100)

 

[Ikram Khaliq]

D

yeah i saw that but why not fatty deposits?

 

[SalmaXXXX]

I have some questions guys !

Q) 21, 22, 37 . Please?

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s12_qp_12.pdf

 

[Pwincessajwa]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s11_qp_12.pdf q6,8,9,21,30,35, anyone plz ?????/

 

[Alicee]

But resolution= wavelength / 2. So the resolution of a 600nm wavelength should give a 300nm resolution. And since resolution is the ability to distinguish between 2 points then 2 membranes 300 nm apart should be seen as separate points..
Right?

nope...the membranes are 7nm....how can you see them with 300nm resolution? even though they are 300nm apart they it dsnt matter if you cant see them how can you distinguish them as seperate points?

 

[kingos3111]

help may june 2007 q4

 

[1357911]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s11_qp_12.pdf q6,8,9,21,30,35, anyone plz ?????/

q-6 this is something which u hav to learn.

q-8
Remember this also. Only tertiary and quartanary structures contain ionic bonds.

q-9
quaternary structure has more than 2 polypeptide chains. Myoglobin has only one. Learn this

 

[1357911]

help may june 2007 q4

I too hav a doubt in the same question

 

[HubbaBubba]

Mm, I don't usually have questions in biology, but can somebody explain the heart graph thing to me? When does the semi lunar valve open/atriolventricular valve open, etc?

 

[1357911]

://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s11_qp_12.pdf q6,8,9,21,30,35, anyone plz ?????/

q-21 see the table. on the ryt hand side anticodons on the tRNA are written. First write the amino acid sequence while seeing the anticodon.
For ex the first one is UUA. the amino acid which will fit in the active site of this tRNA is AAU. and then there is a point that the sequence of the amino acid in the active site of the tRNA is same as the sequence in the DNA molecule.Only the U is replaced by G.
Hope u understand.

 

[HubbaBubba]

help may june 2007 q4

Calibrate it first. Each division is 0.1mm and there are 50 EPG units for each 0.1mm division. Therefore one eyepiece graticule unit is (0.1/50) 0.002mm. (2 micrometers). Take the seed that is growing vertically. On the left picture the bud is at 25 EPG units. It grows to 35 EPG units. That's a difference of 10 EPG units. (10 * 2) = 20 micrometers in 4 hours. So 20/4 = 5 micrometers/hour

 

[Ikram Khaliq]

Which symptoms may be seen in a person affected by chronic obstructive pulmonary disease
(COPD)?
1 persistent cough
2 less elastic alveoli
3 increased risk of lung infection
4 shortness of breath