Which of the following techniques exemplifies phenotypic rescue in a host cell?
A. Introducing a genomic library from a cell that produces a particular gene product into a mutant host cell auxotroph that cannot synthesize the product.
B. Introducing a genomic library from a mutant cell auxotroph for a particular gene product into a host cell that can synthesize that product constitutively.
C. Replacing a mutant gene with a functional gene in a DNA library from an auxotrophic mutant cell prior to introducing the library into a related host cell.
D. Removing genes that encode a particular gene product from a cell that expresses that product constitutively before creating a genomic library.
Answer: A
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Members of the genus Micrococcus usually exist as ________.
A. irregular clusters B. pairs C. tetrads D. All of the choices are correct.
Which of the following does not cause cutaneous mycoses?
A. Microsporum B. Epidermophyton C. Cryptococcus D. Trichophyton
In a life cycle such as that shown in part III of the figure above, if the zygote's chromosome number is 10, which of the following will be true?
A) The sporophyte's chromosome number per cell is 10 and the gametophyte's is 5. B) The sporophyte's chromosome number per cell is 5 and the gametophyte's is 10. C) The sporophyte and gametophyte each have 10 chromosomes per cell. D) The sporophyte and gametophyte each have 5 chromosomes per cell.
During the course of evolution, one of the main threats to human survival was ____________. Persons who stood the best chance of survival were those __________.
(a) extreme cold; who were heavier and had a protective layer of body fat (b) the presence of vegetation that was toxic if eaten; who ate only meat (c) inconsistent food supplies; who preferred high-calorie foods (d) animal predators; who were lean and could ambulate quickly