Genetics - Section 1 Multiple Questions and Answers.
Exercise Questions ::
Genetics
| 16. | Which characteristic will this double-stranded DNA molecule share with a double-stranded RNA molecule of the same size? |
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| A. | Both will have secondary structure. |
| B. | Both will contain inverted repeats. |
| C. | Both will be degraded by base. |
| D. | Both will contain four types of base-pairs. |
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Published by:Rehana Akram
| 17. | Which will be a characteristic of this one single strand? |
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| A. | The single-stranded chain will contain both ribose and deoxyribose |
| B. | The single-stranded chain will contain both purines and pyrimidines. |
| C. | The single-stranded chain will contain one 5’-end and one 3’-end. |
| D. | The single-stranded chain will contain multiple phosphodiester bonds each linking a 2’-carbon and a 5’-carbon. |
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Published by:Rehana Akram
| 18. | When this single strand binds to a complementary DNA strand, |
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| A. | the complementary strand has the sequence 5’-(CT)20-3’ and a cruciform structure could form. |
| B. | the complementary strand has the sequence 5’-(CT)20-3’ and a Z-DNA structure could form |
| C. | the complementary strand has the sequence 5’-(TC)20-3’ and an H-DNA structure could form. |
| D. | the complementary strand has the sequence 5’-(TC)20-3’ and a hairpin structure could form. |
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Published by:Rehana Akram
| 19. | When this single strand binds to a complementary DNA strand to form a B-DNA structure |
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| A. | half the base-pairs will be A-G pairs and half will be C-T pairs |
| B. | each base will form at least two hydrogen bonds with a base in the opposite strand. |
| C. | the two strands will form an antiparallel left-handed helix with 12 basepairs per turn. |
| D. | there will be covalent phosphodiester bonds between the two strands. |
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Published by:Rehana Akram
| 20. | Which of the following forces can stabilize a normal DNA double-helix? |
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| A. | Base-stacking is a non-covalent interaction that occurs between the relatively hydrophobic bases in the interior of the helix. |
| B. | Base-pairing is a non-covalent interaction that occurs between adjacent bases in the same strand of the DNA molecule. |
| C. | The hydrophilic sugar-phosphate groups are on the exterior of the helix where they can interact with each other. |
| D. | The deoxyribose rings form N-glycosidic bonds with the phosphate groups that link neighboring nucleotides. |
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Published by:Rehana Akram
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