In which ribosome site would you find the uncharged tRNA?

A) E site
B) A site
C) P site


Ans: A) E site

Biology & Microbiology

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Which combination of nonfermenting gram-negative bacilli are oxidase positive, but do not grow on MacConkey agar within 24 to 48 hours

a. B. cepacia and Pseudomonas stutzeri b. Brevundimonas dimunuta and Pseudo-monas veronii c. P. aeruginosa and R. insidiosa d. B. vesicularis and Acidovorax facilis

Biology & Microbiology

On occasion, a stressful factor such as disease, starvation, or drought kills a large proportion of the individuals in a

population, producing ____ that dramatically reduces the population size.

a. natural selection b. artificial selection c. a lethal mutation d. a founder effect e. a population bottleneck

Biology & Microbiology

HIV, the virus that causes AIDS in humans, does not infect other animals, but only certain cells in the human body. Why?

What will be an ideal response?

Biology & Microbiology

Which of the following infectious agents is least likely to be damaged by UV exposure?

bacteria viruses fungi protozoa prions

Biology & Microbiology