In addition to penicillins, which group of antibiotics also exhibits a beta-lactam ring structure?
A) Trimethoprim
B) Sulfonamides
C) Cephalosporins
D) Chloramphenicol
Ans: C) Cephalosporins
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While eating lobster for dinner one night your friend asks what you think might happen if this marine invertebrate, which is normally isosmotic with respect to the surrounding seawater, were to be moved to a bay with a slightly lower salt concentration instead of being caught. You reply that, in order for the lobster to be isosmotic with respect to new environment,
A. it must move water in to match the solute concentration of its new environment. B. it regulates its internal concentration of solutes to match that of its new environment. C. it must move water out to match the solute concentration of its new environment. D. it moves water in or out and regulates its internal concentration of water as needed.
Specialized transduction
A. involves the random transmission of any gene. B. involves the transfer of a few specific genes. C. utilizes a defective virus. D. only involves genes near the viral DNA integration site. E. involves the transfer of a few specific genes, utilizes a defective virus AND only involves genes near the viral DNA integration site.
Which statement is true regarding bacteria?
A) All bacteria are pathogens and harmful to humans. B) Some bacteria are pathogens and harmful to humans, whereas lots of bacteria are helpful to humans. C) All bacteria are helpful to humans. D) All bacteria are pathogens, but some harm humans more than others.
What is the role of the villi?
A) To absorb small nutrient molecules from the digestive tract
B) To move food along the digestive tract
C) To secrete digestive enzymes into the digestive tract
D) To secrete water into the digestive tract