The donor cell makes ________ whose function is to bring F- cells close enough to transfer a ________ to the recipient.
A. an F factor; replicated F factor
B. a sex pilus; single strand of DNA
C. a sex pilus; bacterial chromosome
D. a sex pilus; double strand of DNA
E. an F factor; fertility plasmid
Answer: B
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You observe two groups of freshwater fish that spawn at the same time of the year and in the same pond. After females lay their eggs on the pond bottom, males of both species attempt to fertilize them
After some investigation you realize that sperm from both species fertilize the eggs, but embryonic development stops shortly after fertilization when the eggs are fertilized by one species of males, but not by the other. This is an example of ______-zygotic reproductive isolation between the two species. A. pre B. post
All of the following with one exception are
part of an African savanna community. Select the exception.
a. a pride of lions b. Elephant grass c. African wild dogs d. low fertility soils e. Zebras
Which of the following statements regarding enzymes is FALSE?
A) Enzymes are proteins that function as biological catalysts. B) Enzymes are highly specific for the molecules to which they attach. C) The activity of enzymes can be regulated by factors in their environment. D) Enzymes provide energy for the reactions they catalyze. E) An enzyme may be used many times for the same specific reaction.
Eukaryotic chromosomes are made up of only DNA
Indicate whether the statement is true or false