Plants with ____ life cycles typically ____
a. annual; lack secondary growth
b. biennial; die after one growing season
c. perennial; lack secondary growth
d. perennial; lack primary growth
e. annual; do not reproduce
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.
What other factors might influence the size of the prey population?
a. available food supply b. disease c. parasites d. weather e. all of the above
Four of the following plants aremonocots. Which one is the exception?
a. orchid b. wheat c. maple d. grass e. palm
In humans spermatogenesis and oogenesis differ in a number of ways. Which of the following is NOT one of them?
a. number of functional gametes produced by a single meiosis event b. ploidy of final meiotic products c. timing of meiotic divisions (when they occur in the male/female life cycle) d. number of gametes produced in a given time period e. all of these are differences between human male and female gametogenesis