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Q. No.Subtopic: Genetic Code |
75%
Level 2: 60%+
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The lac operon, described in 1961 by Francois Jacob and Jacques Monod, is transcribed when
| 1. | lactose is needed by the cell. |
| 2. | lactose is available to the cell. |
| 3. | lactic acid is needed by the cell. |
| 4. | lactic acid is available to the cell. |
Subtopic: Gene Regulation: Lac Operon |
77%
Level 2: 60%+
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When a mutation is limited to the substitution of one nucleotide pair for another, it is called a
1. translocation.
2. point mutation.
3. sugar-phosphate deletion.
4. base inversion.
1. translocation.
2. point mutation.
3. sugar-phosphate deletion.
4. base inversion.
Subtopic: Mutations and Genetic Code |
86%
Level 1: 80%+
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Which of the following inspired Avery and his colleagues to perform the experiments demonstrating that the transforming principle in bacteria is DNA?
| 1. | the fact that A is equal to T, and G is equal to C |
| 2. | Watson and Crick’s model of DNA structure |
| 3. | Meselson and Stahl’s studies on DNA replication in E. coli |
| 4. | Griffith’s experiments on smooth and rough strains of pneumococci |
Subtopic: Search for Genetic Material |
84%
Level 1: 80%+
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The two complementary strands of the DNA double helix are held to one another by
| 1. | ionic bonds between deoxyribose molecules |
| 2. | ionic bonds between phosphate groups |
| 3. | covalent bonds between nucleotide bases |
| 4. | hydrogen bonds between nucleotide bases |
Subtopic: DNA Double Helix |
88%
Level 1: 80%+
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The experiments in which Meselson and Stahl grew bacteria in heavy nitrogen conclusively demonstrated that DNA
| 1. | is a double helix |
| 2. | replicates semiconservatively |
| 3. | consists of repeating nucleotide subunits |
| 4. | has complementary base pairing |
Subtopic: DNA Replication: I |
92%
Level 1: 80%+
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The signal to start translation is the initiator codon, usually AUG, the codon for
1. tyrosine
2. methionine
3. leucine
4. no amino acid
1. tyrosine
2. methionine
3. leucine
4. no amino acid
Subtopic: Genetic Code |
93%
Level 1: 80%+
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Transcription is most similar to
1. chemiosmosis
2. DNA replication
3. translation
4. facilitated transport
1. chemiosmosis
2. DNA replication
3. translation
4. facilitated transport
Subtopic: DNA Replication | Transcription |
78%
Level 2: 60%+
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In DNA replication, the Okazaki fragments on the lagging strand are joined together by
1. DNA ligase.
2. DNA polymerase.
3. primase.
4. helicase.
1. DNA ligase.
2. DNA polymerase.
3. primase.
4. helicase.
Subtopic: DNA Replication |
91%
Level 1: 80%+
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The number of cytosine bases in a DNA molecule
| 1. | is equal to the number of uracil bases. |
| 2. | is equal to the number of guanine bases. |
| 3. | is equal to the number of adenine bases. |
| 4. | cannot be predicted. |
Subtopic: DNA Double Helix |
90%
Level 1: 80%+
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