Which of the following growth media are both selective and differential and favor Gram negative growth?

A. Blood
B. MacConkey
C. Mannitol Salt Agar
D. Eosin Methylene blue (EMB)
A. A, B, and C
B. B, C, and D
C. B and D
D. A and C
E. A, B, and D


Answer: C. B and D

Biology & Microbiology

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Changes in temperature and pH can decrease an enzymes activity by breaking ________.

A. chemical bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds. E. none of the above is correct.

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If, someday, an archaean cell is discovered whose rRNA sequence is more similar to that of humans than the sequence of mouse rRNA is to that of humans, the best explanation for this apparent discrepancy would be _____

A) homology B) homoplasy C) common ancestry D) retro-evolution by humans

Biology & Microbiology

If a cell had 12 chromosomes at the beginning of meiosis II, how many would each daughter cell have after the completion of meiosis II (cells go from diploid to haploid in Meiosis I)?

A. 6 B. 12 C. 18 D. 24

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Which of the following etiologic agents results in the formation of abscesses?

A) Staphylococcus B) Mycoplasma C) Streptococcus D) Blastomyces E) Coccidioides

Biology & Microbiology