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AS Biology P1 MCQs Preparation Thread

1357911

1357911

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daredevil said:
5) 40 divisions of the eyepiece grat = 0.1 mm (from the stage micrometer)
chloroplast = 5 divisions of the eyepiece grat.
5 divisions of eyepiece graticule = (0.5/40)


6) prokaryotes do not have a nuclear memberane as they do not have a defined nucleus. so the prophase of division of prokaryotes is much shorter without the need to dissolve the nuclear memberane to start the division process.

8) when the two monosacchrides combine they have to realease a water molecule too. so add all the elements e.g. of maltose : -
C12H24O12 --> subtract a H2O molecule from it and u have --> C12H22O11
Click to expand...

in q-8 how do u know the formula of maltose?
 
1357911

1357911

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Which molecule has its synthesis directly controlled by DNA?
A amylase
B cholesterol
C glycogen
D phospholipid
 
daredevil

daredevil

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1357911 said:
in q-8 how do u know the formula of maltose?
Click to expand...
umm firstly it is included in the syllabus so u should know it.
and secondly look 2 glucose molecules undergo condensation to make a maltose. add 2 glucose and u'll get C12H24O12 then subtract a water molecule from them and u'll be left with a maltose molecule i.e. C12H22O11
 
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SalmaXXXX

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I
1357911 said:
Which molecule has its synthesis directly controlled by DNA?
A amylase
B cholesterol
C glycogen
D phospholipid
Click to expand...


I think it's amylase since it's an enzyme ( pure protein) and the DNA controls protein synthesis. From where did you get that question?
 
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fishcook

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SalmaXXXX said:
C is wrong cause with this resolution you can't even see the membrane. It's not about the distance between two membranes. Your eyes won't be able to distinguish it from the medium around it. You need a resolution of more than 7nm to see the cell membrane
Click to expand...
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?
 
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fishcook

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SalmaXXXX said:
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.
Click to expand...
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
 
Ikram Khaliq

Ikram Khaliq

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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
 
imperial

imperial

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Ikram Khaliq said:
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
Click to expand...

D
 
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