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1 | |
What is the smallest unit of heredity? |
| | A) | chromosome |
| | B) | gene |
| | C) | codon |
| | D) | nucleotide |
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2 | |
The nitrogen bases in DNA are bonded to the |
| | A) | phosphate |
| | B) | deoxyribose |
| | C) | ribose |
| | D) | hydrogen |
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3 | |
DNA replication is semiconservative because the _______ strand will become half of the _______ molecule. |
| | A) | RNA, DNA |
| | B) | template, finished |
| | C) | sense, mRNA |
| | D) | codon, anticodon |
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4 | |
In DNA, adenine is the complementary base for ______ , and cytosine is the complement for ______. |
| | A) | guanine, thymine |
| | B) | uracil, guanine |
| | C) | thymine, guanine |
| | D) | thymine, uracil |
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5 | |
The base pairs are held together primarily by |
| | A) | covalent bonds |
| | B) | hydrogen bonds |
| | C) | ionic bonds |
| | D) | gyrases |
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6 | |
Why must the lagging strand of DNA be replicated in short pieces? |
| | A) | because of limited space |
| | B) | otherwise, the helix will become distorted |
| | C) | the DNA polymerase can synthesize in only one direction |
| | D) | to make proofreading of code easier |
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7 | |
Messenger RNA is formed by ______ of a gene on the DNA template strand. |
| | A) | transcription |
| | B) | replication |
| | C) | translation |
| | D) | transformation |
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8 | |
Transfer RNA is the molecule that |
| | A) | contributes to the structure of ribosomes |
| | B) | adapts the genetic code to protein structure |
| | C) | transfers the DNA code to mRNA |
| | D) | provides the master code for amino acids |
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9 | |
As a general rule, the template strand on DNA will always begin with |
| | A) | TAC |
| | B) | AUG |
| | C) | ATG |
| | D) | UAC |
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10 | |
The lac operon is usually in the ______ position and is activated by a/an ______ molecule. |
| | A) | on, repressor |
| | B) | off, inducer |
| | C) | on, inducer |
| | D) | off, repressor |
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11 | |
The repressible operon is important in regulating. |
| | A) | amino acid synthesis |
| | B) | DNA replication |
| | C) | sugar metabolism |
| | D) | ATP synthesis |
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12 | |
For mutations to have an effect on populations of microbes, they must be |
| | A) | inheritable
permanent |
| | B) | beneficial |
| | C) | a and b |
| | D) | all of the above |
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13 | |
Which of the following characteristics is not true of a plasmid? |
| | A) | it is a circular piece of DNA |
| | B) | it is required for normal cell function |
| | C) | it is found in bacteria |
| | D) | it can be transferred from cell to cell |
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14 | |
Which genes can be transferred by all three methods of intermicrobial transfer? |
| | A) | capsule production |
| | B) | toxin production |
| | C) | F factor |
| | D) | drug resistance |
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15 | |
Which of the following would occur through specialized transduction? |
| | A) | acquisition of Hfr plasmid |
| | B) | transfer of genes for toxin production |
| | C) | transfer of genes for capsule formation |
| | D) | transfer of a plasmid with genes for degrading pesticides |
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2002 McGraw-Hill Higher Education