Which of the following could trigger the lytic cycle of a bacteriophage?
A. Host cell stress
B. Host cell replicating its genome
C. Host cell dividing
D. Bacterial protein synthesis
Ans: A. Host cell stress
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If one of Mendel's genes had three alleles that differentially affected the phenotype rather than two, what would he have observed among the progeny of many crosses between all pairs of the three pure-breeding lines in the F1 and F2 generations?
Comments: This case brings up the chance of codominance or incomplete dominance and provides for multiple phenotypes among a large set of crosses. In any one cross, there would be specific pure-breeding strains used, but there could be white, pink, and red flowers that are all pure breeding that may have complete or incomplete dominance. The population effects of this kind of genetics could move toward a broader range of phenotypes leading to the idea of blending inheritance. Mendel's innovative idea was to narrow the traits to simple binary phenotypes. This complication could show what could happen if he had not been so thoughtful. A. In each of the crosses, two phenotypes in the F1 generation. B. Only a single phenotype would be observed in the F1 generation because only one allele can be dominant. C. No evidence would exist for the law of segregation. D. No pure breeding plants produced in the F2. E. None of the responses are correct.
Which of the following characteristics apply to fungi?
a. heterotroph only b. heterotroph, producer c. heterotroph, multicellular, cell wall d. heterotroph, producer, multicellular, cell wall
Mud flats are typically low in organic matter
Indicate whether the statement is true or false
With regard to nutrient pollution in aquatic ecosystems, when is the worst time to apply fertilizer to your lawn?
A) when it is raining, or is about to rain B) when it is cold, or is about to get cold C) at the same time you apply pesticides D) at night