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Structure and chemical composition of DNA

This quiz is based on the physical structure and chemical composition of DNA. It deals with basic concepts related to DNA chemistry and DNA methods.

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Multiple choice

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The difference between DNA and RNA is :

  The RNA sugar phosphate backbone contains ribose rather than deoxyribose.

  DNA molecules are double stranded while RNA molecules are single stranded for the most part.

  Thymine in DNA is replaced by Uracil in RNA.

  All of the above.

  Half-n-half Clue


In the DNA Double Helix, complementary base pairs are held together by :

  ionic bonds

  hydrogen bonds

  peptide bonds

  N-glycosidic bonds

  Half-n-half Clue


The DNA molecules of different species differ in their :

  phosphate backbone

  sequence of bases

  type of nucleotides

  All of the above

  Half-n-half Clue


How does the sequence of a strand of DNA correspond to the amino acid sequence of a protein ? This concept is explained by the central dogma of molecular biology which states that :

  DNA is replicated and sections of the replica are used to make protein.

  DNA is used to make RNA which is used to make protein.

  protein is manufactured directly from DNA without any intermediate.

  None of the above.

  Half-n-half Clue


The three pyrimidine bases in DNA are :

  Cytosine,Thymine and Uracil

  Thymine, Guanine and Cytosine

  Adenine, Uracil and Guanine

  Adenine, Thymine and Guanine

  Half-n-half Clue


The unit within the nucleus that contains a protein complex (located at the center of the unit) of two H2A, H2B, H3 and H4 histone proteins with DNA wrapped around the complex in two turns, each turn consisting of about 80 base pairs is called a :





  Half-n-half Clue


The DNA molecule is a polymer. Its monomer units are :

  amino acids



  nucleic acids

  Half-n-half Clue

5 more pages in Molecular Biology

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