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AS Biology P1 MCQs Preparation Thread

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sophiaaa

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geek101 said:
for a plant cell the water potential = solute potential + pressure potential
since pressure potential = 0
so water potential = solute potential
(remember thats not the case always)
so due to the high conc of assimilates the water potential decreases and so the solute potential also decreases.
Click to expand...
but pressure potential=0 only when the celll is fully plasmolysed.bt here thats nt d case...so rethink...
 
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geek101

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sophiaaa said:
but pressure potential=0 only when the celll is fully plasmolysed.bt here thats nt d case...so rethink...
Click to expand...


hmm, ok so looking at the equation again...
wp = sp + pp, in the sieve element the water potential is more negative, which means the solute potential is even more negative according to the equation, so if the water potential is lowering cuz of the assimilates the solute potential is even lower and it gives the answer C as well...
 
fathimaash

fathimaash

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sahania said:
The answer is B ... Can anyone help please ?View attachment 12444
Click to expand...
k
u knw dat each amino acid is coded with 3 bases ( each nucleotide has one base)
so 6000 nucleotides given hence divide 6000 by 3 which is 2000.
so 2000 divide by 2 will gv da total no of amino acids in each polypeptide chain (remember DNA is a double strand)
Ans is 1000 which is B.
Hope u understand
 
Haniya Khan

Haniya Khan

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abdullah ash said:
k
u knw dat each amino acid is coded with 3 bases ( each nucleotide has one base)
so 6000 nucleotides given hence divide 6000 by 3 which is 2000.
so 2000 divide by 2 will gv da total no of amino acids in each polypeptide chain (remember DNA is a double strand)
Ans is 1000 which is B.
Hope u understand
Click to expand...
can u help me in my problems pls?????
 
fathimaash

fathimaash

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Haniya Khan said:
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s07_qp_1.pdf
mcq 1,15 and 26
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w07_qp_1.pdf
MCQ 1,6,25,,31,40
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m.j.07
q1- 15000/750=20 dat is divide da diametr of eukaryotic by prokaryoti ( rembr to conert the units) =>B
q15- for 3 c sugar da uptake increas with da temperature in both cases so its proves da diffusion takes place whereas for 6 c sugar with nitrogn gas bubbled the rate decreases so it cant be diffusion it should be active transport so =>C
q26- wen its flooded wit salty water da water potential decrases in da soil so da watr potential of soil is less it becomes more ngative. onli option is => D
 
A

anitadesai

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thunderingthunder said:
The sequence of bases on a messenger RNA molecule is shown.
A U C G A A G U U C G U
It was transcribed from one strand of DNA.
What is the sequence of bases on the complementary,non-transcribed strand?
A.A C G A A C T T C G A T
B.A T C G A A G T T C G T
C.T A G C T T C A A G C A
D.U G C U U G A A G C U A
Y is the answer B??
Shouldn't it be C?
Click to expand...



it is B cz they are not talkin abt da DNA frm which da mRNA ws made bt da non trancribed one therefore da ans is B
HOPE ITS HELPFUL!!!!!!!!!!!!!:)
 
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