The most selective antibacterial agents are those that interfere with bacterial cell wall synthesis. This is because
A. bacterial cell wall synthesis is easily inhibited whereas eukaryotic cell wall synthesis is more resistant to the actions of the drugs.
B. eukaryotic cells inactivate the drugs before they can do any damage.
C. bacterial cell walls have a unique structure not found in eukaryotic host cells.
D. eukaryotic cells do not take up the drugs.
Answer: C
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A patient is brought to the hospital after experiencing acute fatigue. The patient’s condition deteriorates rapidly during testing, despite alarmingly high blood glucose levels, and he has no history of diabetes. Initial tests also show low levels of glucose-6-phosphate. The results of further diagnostic testing are not available yet, but based on what you know, which hypothesis could explain the patient’s condition?
a. The patient has a severe phosphate deficiency, preventing phosphorylation of ADP molecules. b. The patient has inherited a mutated form of gene that regulates phosphofructokinase production. c. The patient has been exposed to a substance that binds to hexokinase and inhibits its function. d. The patient has depleted acetyl CoA, which has caused his citric acid cycle to come to a complete stop.
Which genus contains the nitrogen-fixing bacteria that live in legume nodules?
A) Bacillus B) Escherichia C) Rhizobium D) Vibrio
Which of the following pairs is mismatched?
A) teleomorph — produces both sexual and asexual spores B) dermatomycosis — fungal infection of the skin C) dimorphic fungus — grows as a yeast or a mold D) systemic mycosis — fungal infection of body organs E) coenocytic hyphae — hyphae with cross-walls
Male hummingbirds flash a patch of iridescent feathers on their neck called the gorget. This behavior makes them very visible. Why advertise their presence to a predator?
A. Hummingbirds are so fast that predation is not a large factor for them. B. This is an example of a maladaptive behavior that decreases overall fitness. C. The benefits of defending a territory exceed the costs of predation. D. Predators cannot see colors so are not alerted.