The motile feeding stage of protozoa is called the

A. food vacuole.
B. trophozoite.
C. oocyst.
D. cyst.
E. sporozoite.


Answer: B

Biology & Microbiology

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Two reasons for two selectable markers in a YAC vector are:

A. to insure the EcoRI digest is complete. B. to insure the desired recombinant construct has telomeres on both ends. C. to contribute to the centromere structure. D. to increase transformation efficiency. E. to eliminate the possibility of screening unstable recombinants.

Biology & Microbiology

In the study involving periwinkle snails and their algal food sources, which conclusion can be drawn?

a. Periwinkles eliminated all algae and died out. b. Periwinkles eliminated all of the less dominant algae species. c. Periwinkles eliminated the dominant algae entirely. d. Periwinkles had no effect on the algae populations. e. Periwinkles can increase or decrease species richness depending on which algal species it is consuming.

Biology & Microbiology

When a population is made up of individuals

who are genetically identical, each individual is said to be a ____ of other individuals.

a. homolog b. clone c. twin d. recombinant e. probe

Biology & Microbiology

Of the following, which is used to inhibit specific enzymes in the treatment of many bacterial and viral diseases?

A) substrate analogues B) noncompetitive inhibitors C) denaturing agents D) allosteric regulation E) hydrogenases

Biology & Microbiology