What non-radioactive isotope was use by Meselson and Stahl to label DNA in their experiment?

1 35S2 15N3 32P4 None

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A molecule that can act as a genetic material must fulfill all the following criteria except :

(1) It should be able to generate its replica

(2) It should chemically and structurally be stable

(3) It should provide scope for rapid mutations

(4) It should be able to express itself in the form of "Mendelian Characters"

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The unequivocal proof that DNA is the genetic material was provided by :

(1) Avery, Macleod and McCarty

(2) Hershey and Chase

(3) Meselson and Stahl

(4) Watson and Crick

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Histones are :

(1) Positively charged and basic amino acids

(2) Negatively charged and basic proteins

(3) Positively charged and acidic proteins

(4) Not found in bacteria

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Which of the following is not a feature of the double helix model of DNA ?

(1) The two chains have anti-parallel polarity

(2) A purine always comes opposite to a pyrimidine

(3) The pitch of the DNA is 3.4 nm

(4) The two chains are coiled in a left handed fashion

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According to Erwin Chargaff, for a double stranded DNA

(1) The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant and equals one. 

(2) The ratios between Adenine and Thymine, and, Guanine and Cytosine are constant but is not equal to one. 

(3) The ratios between Adenine and Guanine, and,Thymine, and Cytosine are constant and equals one. 

(4) The ratios between Adenine and Guanine, and, Thymine and, Cytosine are constant but is not equal to one. 

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To form a nucleoside, a nitrogenous base is linked to a pentose sugar:

(1) Through a P-Glycosidic linkage at carbon atom number 1

(2) Through a P-Glycosidic linkage at carbon atom number 5

(3) Through a N-Glycosidic linkage at carbon atom number 1

(4) Through a N-Glycosidic linkage at carbon atom number 5

 

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Identify the incorrectly matched pair:

 

Organism

Length of DNA

(1)  

Bacteriophage ϕ 174

5386 base pairs

(2)

Bacteriophage Lambda   

48502 base pairs

(3)

Eschrechia coli

4×106  base pairs

(4)

Human beings

3.3×109  base pairs

 

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The amino acid acceptor arm of the tRNA is at its:

(1) DHU loop

(2) TψC loop

(3) 5' end

(4) 3' end

 

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Which of the following codons has a dual role in the genetic code?

(1) AUG

(2) GUG

(3) CUG

(4) UUG

 

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