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Class 12 Biology
Molecular Basis Of Inheritance Chapter 6
Quiz 1
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Who among the following scientists had no contribution in the development of the double helix model for the structure of DNA?
0%
Meselson and Stahl
0%
Rosalind Franklin
0%
Erwin Chargaff
0%
Maurice Wilkins
DNA has genetic properties was revealed for the first time by
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Chargaff
0%
Griffith
0%
Avery
0%
Wilkins
The beginning of understanding genetic transformation in bacteria was made by
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Hershey and Chase
0%
Watson and Crick
0%
Frederick Griffith
0%
T. H. Morgan
DNA contains nucleobases, sugar and phosphate. Removal of which among these from a DNA sample will not significantly affect the length of DNA?
0%
Nucleobases
0%
Sugar
0%
Phosphate
0%
None of the above
According to Chargaff's rule, which one is correct?
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[A] + [T] = [G] + [C]
0%
[A] + [C] = [G] + [T]
0%
[A] + [G] = [T] + [C]
0%
All of these
Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a triplet?
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Nirenberg and Matthaei correct
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Hershey and Chase
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Beadle and Tatum
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Morgan and Sturtevant
In Hershey and Chase experiments, radioactive 32P was used to culture bacteriophages which resulted in radioactive
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Protein capsule of bacteriophage
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Viral DNA
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Bacterial capsule
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Viral proteins
Which of the following is a structural subunit of DNA?
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Nucleotides correct
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Carbohydrate
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Protein
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RNA
Which of the following are the functions of RNA?
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It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.
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It carries amino acids to ribosomes.
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It is a constituent component of ribosomes.
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All of the above.
While analysing the DNA of an organism, a total number of 5386 nucleotides were found out of which the proportion of different bases were Adenine = 29%, Guanine = 17%, Cytosine = 32% and Thymine = 17%. Considering the Chargaff’s rule, it can be concluded that
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It is a double-stranded linear DNA.
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It is single-stranded DNA.
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No conclusion can be drawn.
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It is a double-stranded circular DNA.
Nitrogenous bases present in DNA:
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Adenine, guanine, cytosine, thymine
0%
Guanine, uracil
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Adenine, guanine, cytosine, uracil
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Adenine, thymine, uracil
Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that
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Genes carry information for making proteins.
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Enzymes are required to repair damage.
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Cells need specific enzymes in order to function.
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Genes are made up of DNA.
A typical nucleosome contains
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100 bp of DNA helix
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400 bp of DNA helix
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200 bp of DNA helix
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300 bp of DNA helix
DNA nucleotides are attached by
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Van der Waals bond
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Electrovalent bond
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Hydrogen bond
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Covalent bond
In the DNA molecule,
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There are two strands which run parallel in the 5'-3' direction.
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The total amount of purine nucleotides and pyrimidine nucleotides is not always equal.
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Proportion of adenine in relation to thymine varies with the organism.
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There are two strands which run antiparallel - one in 5'-3' direction and other in 3'-5' direction.
Retroviruses have genetic material
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DNA only
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Either DNA or RNA only
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DNA or RNA only
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RNA only
If the percentage of cytosine is 18%, then the percentage of adenine will be
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64%
0%
32%
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23%
0%
36%
Uracil is present in RNA at the place of
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Adenine
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Thymine
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Guanine
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Cytosine
The genetic material of a viroid is
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Protein
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DNA
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Carbohydrate
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RNA
The net electric charge on DNA and histones is
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Negative and positive, respectively
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Both negative
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Both positive
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Zero
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