Question: 1. In Mendel’s monohybrid cross between true-breeding round and
wrinkled peas, the F2 progeny con…
1. In Mendel’s monohybrid cross between true-breeding round and
wrinkled peas, the F2 progeny consisted of the genotypes RR, Rr,
and rr (see the figure in the Hint). Which genotype(s) from this F2
generation will breed true if self-crossed?
| A) | Rr |
| B) | RR |
| C) | rr |
| D) | RR and rr |
2. Which of the following methods can be used to simultaneously
measure the expression of thousands of different genes?
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A) northern blot hybridization |
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B) immunohistochemistry |
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C) sequencing an entire genome |
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D) hybridization to a DNA microarray |
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E) in situ hybridization |
3. An E. coli strain carries two copies of the
lac operon; one on its chromosome; and one on an F’
plasmid. The genotype is:
lacI– lacO+ lacZ+/ F
lacI+ lacO+ lacZ–
Assume that glucose is absent as a nutrient. What would be the
phenotype of these cells?
| A) Basal expression of beta-galactosidase in the presence or absence of lactose. |
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| B) Activated expression of beta-galactosidase in the presence of lactose; repressed expression of beta-galactosidase in the absence of lactose. |
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| C) Activated expression of beta-galactosidase in the presence or absence of lactose. |
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| D) Basal expression of beta-galactosidase in the presence of lactose; repressed expression of beta-galactosidase in the absence of lactose. |
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| E) Activated expression of beta-galactosidase in the presence of lactose; basal expression of beta-galactosidase in the absence of lactose. |
4. Which of the following is true of the bacteriophage protein
cI (also known as the lambda repressor)?
| A) Can bind operator sequences as a monomer. | |
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B) Is degraded by the E. coli protease FtsH. C) Can serve as a transcriptional activator or repressor. D) Promotes the lytic phase of phage propagation. E) Can bind to operators associated with PR but not |
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