Which of the following is NOT involved in the regulation of the lac operon?

A) an inducer
B) a repressor protein
C) an iRNA
D) glucose
E) cyclic AMP


C

Biology & Microbiology

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You begin an experiment with two populations of E. coli that are each composed of 100 cells. The cells are all genetically identical (i.e., they are clones). You grow them up in flasks on a lab bench under identical conditions with unlimited resources

After 10,000 generations, you analyze the genome of each population. Do you expect the genomes of each population to be identical after 10,000 generations? A. Yes, because the starting populations were genetically identical. B. Yes, because resources were unlimited. C. No, because mutations will accumulate independently in each population. D. No, because natural selection was not a factor at any point in this experiment. E. No, because mutation and natural selection (once genetic variation is present) were factors in this experiment.

Biology & Microbiology

Respond to statements 113–117 with reference to the five biomes

listed below. a. tundra b. grassland c. desert d. taiga e. savanna M 113. A plant community composed primarily of shrubby trees widely spaced and surrounded by grasses is this biome. M 114. A community composed of herbaceous plants, no trees, a very short growing season, and relatively few animal species is likely to be this biome. E 115. Variable daily temperatures and plants that are highly resistant to desiccation characterize this biome. M 116. This biome has the richest soils. E 117. Conifers are most likely to be found in this biome.

Biology & Microbiology

How does an intercalating agent such as ethidium bromide cause mutations?

What will be an ideal response?

Biology & Microbiology

The vertebrate kidney helps to keep the acidity of body fluids constant by varying the amount of hydrogen ions (H+) it secretes into the urine. You can confidently predict that this aspect of kidney function will be controlled by

A) a positive feedback mechanism. B) a negative feedback mechanism. C) nerve impulses from the brain. D) a hormone produced in the kidney itself.

Biology & Microbiology