Antimicrobials that are macrolides
A. include azithromycin, clarithromcyin, and erythromycin.
B. disrupt cell membrane function.
C. are very narrow-spectrum drugs.
D. include tetracyclines.
E. are hepatotoxic.
Answer: A
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The first chemicals that provided potential energy on Earth may have been formaldehyde and hydrogen cyanide. While these were produced by sunlight-driven reactions, they also occurred around deep-sea vents. If the first organisms on Earth evolved around
these vents, the first life on Earth was _____. A) photosynthetic, obtaining energy from the Sun B) chemosynthetic, obtaining energy from chemicals C) herbivorous, obtaining energy from plants D) carnivorous, obtaining energy from animals
What type of cells keep neurons positioned where they should be, and provide them with metabolic support?
a. other neurons b. loose connective tissue c. neuroglia d. fibroblasts and their collagen secretions e. simple cuboidal epithelium
An insect that resembles leaves is using to avoid predation.
A. warning coloration B. mimicry C. mutualism D. chemical defense E. camouflage
Which type(s) of mutation might lead to a threonine auxotrophic revertant?
A. Point mutation B. Missense mutation C. Base substitution D. All of the choices are correct.