1. In the DNA Double Helix, complementary base pairs are held together by :   ionic bonds   peptide bonds   N-glycosidic bonds   hydrogen bonds   Hint Half-n-half Clue   2. Each nucleotide in a DNA molecule consists of :   a phosphate group,a pentose sugar and a nitrogeneous heterocyclic base.   a sulfonyl group, a pentose sugar, and a nitrogeneous heterocyclic base.   a phosphate group, a pentose sugar, and a oxygen base.   a phosphate group, a hexose sugar and a nitrogeneous heterocyclic base.   Half-n-half Clue   3. A significant difference between prokaryotes and eukaryotes is :   Prokaryotes do not have DNA as their genetic material while eukaryotes do.   Prokaryotes do not have ribosomes while eukaryotes do.   The DNA of prokaryotes floats freely around the cell while the DNA of eukaryotes is held within its nucleus.   Prokaryote cells are not membrane-bound while eukaryote cells are.   Half-n-half Clue   4. The single stranded molecule that is transcribed from a DNA template (i.e a photocopy of a specific section of the DNA molecule) and is subsequently used to manufacture proteins is :   tRNA   mRNA   rRNA   snRNA   Half-n-half Clue   5. 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   6. A DNA strand has the sequence A-C-A-G-C-C-G-T-A. What would be its complementary strand ?   U-G-U-C-G-G-C-A-U   G-T-G-A-T-T-A-C-G   A-C-A-G-C-C-G-T-A   T-G-T-C-G-G-C-A-T   Half-n-half Clue   7. Melting of DNA is a standard method for preparing "single stranded DNA". A 4000 kb (kilobase- pair) DNA molecule melts at 79oC. What percent of the base pairs are GC pairs?   42.4 %   24.4 %   30.4 %   2.44 %   Half-n-half Clue