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