When a vector that employs the lacZ gene as a second marker is used in a cloning experiment, bacteria that harbor the recombinant DNA will give rise to
A. red colonies.
B. white colonies.
C. blue colonies.
D. All of the choices are correct.
B
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During crossing over in meiosis, an incomplete exchange of genetic material occurs. This would most likely produce
A. a deficiency in one homologue and a duplication in the other homologue. B. a deficiency in both homologues. C. a deficiency in one homologue and an inversion in the other homologue. D. a reciprocal translocation. E. a duplication in one homologue and an inversion in the other homologue.
Within one or two weeks after infection with Plasmodium, ruptured liver cells release _____ and cellular debris into
the host's bloodstream, causing fever and weakness characteristic of malaria. a. sporozoites b. merozoites c. Anopheles mosquitoes d. gametocytes e. zygotes
All of the following act as surfactants except ________.
A. soaps B. iodine C. alcohols D. quaternary ammonia E. detergents
Of the following choices, the epithelium with the shortest diffusion distance is _____
A) simple squamous epithelium B) simple columnar epithelium C) pseudostratified ciliated columnar epithelium D) stratified squamous epithelium