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Biology MCQ thread..!!

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Can anyone give me the correct answer with an understandable explanation please? :)

Winter/Oct/Nov 2008, No. 18
 
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Answer is A.

As the question mentions, substance X replaces telomeres which help DNA replication. So, when substance X is present, the telomeres are continually replaced. So, DNA replication proceeds normally.

But, when Substance X isn't present. Some of the telomeres will be lost each time mitosis occurs. Eventually, there won't be any telomeres. So, DNA replication STOPS!
 
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if soil water will b more negative than xylem..that water doesnot move inside....this is done bcoz of salty water...due to this....option A and B are eliminated..now the water potential cannot b zero in xylem..!! thus anaswer is D
 
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Which statement describes a cell that is capable of reproduction and belonging to a haploid
organism?
A It has chromosomes that contain one polynucleotide chain.
B It is capable of carrying out a reduction division to form gametes.
C It possesses two copies of each gene as a result of fertilisation.
D It will undergo cell division by mitosis during asexual reproduction
 
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measure the diagram vertically...!! ..!! and write that reading..!! this is what u measured...suppose u got 3cm here..

then, put the scale in the line where it has said scale bar..measure and conclude what is the measured value for length of 2nm....lets say u got that line around 0.5cm..then...0.5cm=2nm so 3cm=12nm..u can get this way!! and sorry gal( for the word man..lol!!)
 
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zxc1230 said:
Which statement describes a cell that is capable of reproduction and belonging to a haploid
organism?
A It has chromosomes that contain one polynucleotide chain.
B It is capable of carrying out a reduction division to form gametes.
C It possesses two copies of each gene as a result of fertilisation.
D It will undergo cell division by mitosis during asexual reproduction

is it D ?
 
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zxc1230 said:
Which statement describes a cell that is capable of reproduction and belonging to a haploid
organism?
A It has chromosomes that contain one polynucleotide chain.
B It is capable of carrying out a reduction division to form gametes.
C It possesses two copies of each gene as a result of fertilisation.
D It will undergo cell division by mitosis during asexual reproduction


i think its D
 
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