Penicillin is useless for the treatment of primary atypical pneumonia because the causative organisms
A. develop resistance rapidly
B. are Gram-negative
C. have no cell wall
D. grow only within the cells
E. possess penicillin-resistant PBPs
Answer: C. have no cell wall
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The goal of eugenics is to
a. selectively engineer and change normal human traits into what some perceive to be more desirable characteristics. b. eliminate genetic disorders. c. produce genetically identical humans. d. eliminate genes for abnormal behavior. e. accomplish all of these
A normal red blood cell count range is __________
per microliter. a. 3,000–6,750 b. 20,000–100,000 c. 250,000–300,000 d. 1.6–3.2 million e. 4.8–5.4 million
In the following community, which serves as the keystone species?
A) killer whales B) sea otters C) sea urchins D) kelp bed
What is the best approach for preventing GMOs from surviving containment and passing their genes among microbes in the environment?
a. encoding self-toxin systems b. using auxotrophic strains that require an amino acid supplement for growth c. recoding strains to be auxotrophic for a synthetic amino acid d. recoding strains to not use ribosomes