If you were to replace the phosphate group of a phospholipid with a fatty acid chain, you would have
A. a triglyceride.
B. glycolipid.
C. glycerol.
D. cholesterol.
Answer: A
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Why does E. coli shut down the trp operon if tryptophan is available in the environment?
a. Synthesizing an amino acid takes energy so it is a waste of energy to make something that is already available. b. Environmental tryptophan is of higher quality than what the E. coli can make itself. c. The trp operon encodes genes that export tryptophan from the cell; if there is already tryptophan in the environment, further export isn't necessary. d. It doesn't shut down the trp operon but only lowers the level of trp operon activity. e. E. coli actually turns the trp operon on when tryptophan is present; tryptophan is an energy source for the cell, and there is no reason to make enzymes to degrade something that is lacking in the environment.
As you walk between classes on your college campus, you notice squirrels busily burying acorns. You realize you are witnessing what ecosystem service?
A. Biological control B. Pest control C. Seed dispersal D. Pollination E. Erosion control
Which of the following is a characteristic of the third line of defense that makes it significantly different from the second line?
A. The response is specific to a single antigen. B. The initial response is very rapid, beginning in minutes to a couple of hours. C. The response is effective on a broad range of antigens. D. The response to a second exposure is similar to the response to a first exposure. E. The responding cells are a variety of cell types.
Select the reaction that is most likely to be a tropism.
A. plants bending away from a heat source B. flowers blooming when it is warm C. induction of seed dormancy D. production of aerenchyma