1. 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.   Hint Half-n-half Clue   2. 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   3. 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   4. 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   5. 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   6. 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 :   ribosome   nucleosome   histosome   centrosome   Half-n-half Clue   7. The DNA molecule is a polymer. Its monomer units are :   amino acids   nucleotides   nucleosides   nucleic acids   Half-n-half Clue