1. 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 :   nucleosome   centrosome   ribosome   histosome   Hint Half-n-half Clue   2. 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   3. Where would you expect to find genetic information describing the characteristics of a Dodo ?   In virtually every cell in its body.   In its feathers !   In the ribosomes.   In the primary spermatocytes.   Half-n-half Clue   4. 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   5. Each nucleotide in a DNA molecule consists of :   a phosphate group, a hexose sugar and a nitrogeneous heterocyclic base.   a phosphate group, a pentose sugar, and a oxygen base.   a sulfonyl group, a pentose sugar, and a nitrogeneous heterocyclic base.   a phosphate group,a pentose sugar and a nitrogeneous heterocyclic base.   Half-n-half Clue   6. The three pyrimidine bases in DNA are :   Adenine, Thymine and Guanine   Cytosine,Thymine and Uracil   Adenine, Uracil and Guanine   Thymine, Guanine and Cytosine   Half-n-half Clue   7. A nucleoside consists of :   a phosphate group, a pentose sugar and a nitrogeneous heterocyclic base.   a pentose sugar and a oxygen base.   a hexose sugar and a nitrogeneous heterocyclic base.   a pentose sugar and a nitrogeneous heterocyclic base.   Half-n-half Clue