Historically, which of the following was instilled into the eyes of newborn infants to prevent gonococcal infections?

A. formaldehyde
B. mercurochrome
C. silver nitrate
D. phenol
E. triclosan


Answer: C

Biology & Microbiology

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A(n) __________ property is a characteristic of a

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WT yeast (TRP+) can synthesize the amino acid tryptophan and can grow on media plates lacking tryptophan

In contrast, mutant alleles (trp?) block tryptophan synthesis and result in an inability of mutant strains to grow on media lacking tryptophan. A diploid yeast was made through the cross MATa ADE+ × MAT? ade?. Meiosis was induced in the diploid strain to produce an ascus with four haploid spores, which were separated and grown on plates lacking tryptophan. How many spores are expected to grow into colonies on the plate? A) 0 B) 1 C) 2 D) 3 E) 4

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Parenchyma and pith are cells derived from

a. meristem tissue b. ground tissue c. vascular cambium tissue d. cork cambium tissue e. epidermal tissue

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Viruses are classified based on which of the following?

a. nucleic acid content. b. presence or absence of an envelope. c. structure of capsid. d. all of the above.

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