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| 1 | |
Which of these is NOT involved with excision-repair of damaged DNA? |
| | A) | The UvrABC complex. |
| | B) | Recognition of damage. |
| | C) | Removal of damage region. |
| | D) | Resynthesis using the information on the undamaged strand as a template. |
| | E) | All of these are involved with excision-repair of damaged DNA. |
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| 2 | |
The three parts of each nucleotide are |
| | A) | Cytosine, ribose, and phosphate. |
| | B) | Amino group, phosphate, and pentose sugar. |
| | C) | Phosphate, ribose, and nitrogenous base. |
| | D) | Nitrogenous base, phosphate, and pentose sugar. |
| | E) | Pentose, cytosine, and phosphate. |
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| 3 | |
A eukaryotic chromosome has multiple origins of replication. |
| | A) | True |
| | B) | False |
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| 4 | |
Screening consumer products for potential mutagens |
| | A) | demonstrates that most mutagens operate on DNA using similar chemical mechanisms of action. |
| | B) | reduces natural sources of mutation. |
| | C) | means that organic food and products are unlikely to cause DNA damage. |
| | D) | eliminates sources of mutation except for ultraviolet light. |
| | E) | only reduces the load of mutagens we are exposed to, but does not eliminate them. |
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| 5 | |
What functional group is found at the 5' end of a DNA strand? |
| | A) | a phosphate group |
| | B) | a hydroxyl group |
| | C) | a carbonyl group |
| | D) | a deoxyribose sugar |
| | E) | a carboxyl group |
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| 6 | |
In the Watson-Crick model of the DNA double helix, the molecules have the appearance of a twisted ladder. The "steps" or "rungs" of the ladder are composed of |
| | A) | sugars. |
| | B) | paired bases. |
| | C) | phosphates. |
| | D) | a sugar and a phosphate molecule. |
| | E) | sulfur bonds. |
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| 7 | |
If 30% of an organism's DNA is thymine, then |
| | A) | 70% is deoxyribose. |
| | B) | 20% is guanine. |
| | C) | 30% is adenine. |
| | D) | 20% is guanine, and 30% is adenine. |
| | E) | 50% is guanine |
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| 8 | |
In a DNA molecule, the |
| | A) | bases are covalently bonded to one another. |
| | B) | sugars are composed of 8 carbon rings. |
| | C) | bases are hydrogen bonded to one another. |
| | D) | nucleotides are hydrogen bonded to one another. |
| | E) | All of the choices are correct. |
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| 9 | |
Which of the following contains thymine? |
| | A) | DNA |
| | B) | mRNA |
| | C) | rRNA |
| | D) | protein |
| | E) | tRNA |
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| 10 | |
Whose research suggested that the DNA molecule has the shape of a helix, or Corkscrew? |
| | A) | James Watson |
| | B) | Francis Crick |
| | C) | Matthew Meselson |
| | D) | Franklin Stahl |
| | E) | Rosalind Franklin |
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| 11 | |
Which of the following is NOT true about DNA? |
| | A) | It has the structure of a double helix. |
| | B) | Bases between the two strands are held together by hydrogen bonds. |
| | C) | Bases are complementary to each other. |
| | D) | DNA incorporates a deoxyribose sugar. |
| | E) | DNA contains adenine, guanine, cytosine, and uracil. |
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| 12 | |
During DNA replication, |
| | A) | each base forms hydrogen bonds with a complementary base. |
| | B) | each base forms hydrogen bonds with the same type of base. |
| | C) | bases do not form hydrogen bonds. |
| | D) | uracil bonds with adenine. |
| | E) | ribose sugars bond with complementary bases. |
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| 13 | |
The enzyme that joins DNA complementary nucleotides together is |
| | A) | DNA polymerase. |
| | B) | RNA polymerase. |
| | C) | helicase. |
| | D) | ribozyme. |
| | E) | lipase. |
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| 14 | |
If one strand of DNA has the base sequence ATCGTA, what will the complementary strand have? |
| | A) | TAGCAT |
| | B) | ATCGTA |
| | C) | CAGTCT |
| | D) | ATGCTA |
| | E) | UAGCAU |
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| 15 | |
Research indicates a relationship between cell aging and |
| | A) | Polymerase activity. |
| | B) | Helicase activity. |
| | C) | The size of the replication complex. |
| | D) | Priming mistakes. |
| | E) | Telomere length. |
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