A mutualistic symbiosis where fungal hyphae penetrate plant root cells is called a(n) ____
a. ectomycorrhiza
b. lichen
c. arbuscule
d. endomycorrhiza
e. haustorium
D
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During genetic drift the gene frequencies of a population will change ________
a. back and forth and eventually stabilize b. in a random direction based upon chance c. in a random direction based upon the predators faced by the population d. in a predictable direction based upon the number of females in the population e. in a predictable direction based upon the number of males in the population
The chromatids detach from one another and
become visibly separate chromosomes during a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
Communities are composed of all of the:a
communities of all the different populations that live together within an area. b. ecosystems within the biosphere. c. populations of all the different species that live together within an area. d. various dispersal patterns of the different species within a given area. e. population's females' combined reproductive capabilities within the same given unit of time.
Which of the following statements about the Lac operon is false?
(a) The Lac repressor binds when lactose is present in the cell. (b) Even when the CAP activator is bound to DNA, if lactose is not present, the Lac operon will not be transcribed. (c) The CAP activator can only bind DNA when it is bound to cAMP. (d) The Lac operon only produces RNA when lactose is present and glucose is absent.