During elongation, which site in the ribosome represents the location where a codon is being read?
A) E site
B) P site
C) A site
D) the small ribosomal subunit
Answer: C
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In what clinical situation is it most appropriate to use a broad-spectrum antimicrobial?
A. In an example of a pediatric otitis media (middle ear) infection. We can't properly test for the specific drug that would best eliminate the infection due to its location, so we use a broad-spectrum drug instead. B. In a case of viral meningitis. The infection spreads so quickly that we must treat it with an antibacterial drug as quickly as possible. We don't have time to determine which drug will work best, because the patient will die in the meantime. C. In a case of bacterial meningitis. The infection spreads so quickly that we must treat it with an antibacterial drug as quickly as possible. We don't have time to determine which drug will work best, because the patient will die in the meantime. D. In a case of Staphylococcus aureus skin infection. Since this microbe can be resistant to several types of drugs, we want to use one that has the broadest spectrum possible to treat this microbe-specific infection.
A notable exception to this evolutionary adaptation is the lack of any flying species within the
A. reptiles. B. amphibians. C. birds. D. insects. E. mammals.
Plant species in California's Santa Rosa Mountains are seen to be
A) moving southward. B) growing larger in size. C) moving to higher elevation. D) unaffected by climate change.
An achondroplastic male dwarf with normal vision marries a color-blind woman of normal height. The man's father was six-feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive. They have a daughter who is a dwarf with normal color vision. What is the probability that she is heterozygous for both genes?
A) 0 B) 0.25 C) 0.50 D) 0.75 E) 1.00