What happens when a phage containing bacterial DNA attaches to and injects DNA into another bacterial cell?
a. the phage is destroyed
b. the phage replicates
c. the bacterial cell dies from the phage infection
d. the bacterial cell lives and produces many copies of the phage
e. the bacterial cell becomes a partial diploid and may undergo genetic recombination
ANSWER: e
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What is the advantage of forcing materials to travel through cells instead of between cells?
A. Cells can control which materials are transported. B. Exposure to toxins is limited. C. Exposure to bacteria or viruses is limited. D. All of the above are correct.
In Lives and Opinions of the Eminent Philosophers, Diogenes recounts how Plato’s Academy amended his definition of a human—“a featherless biped” to include “with broad, flat nails”—after Diogenes brought him a plucked chicken. Clearly, none of these philosophers were being entirely serious, but this exchange highlights a difficulty with phylogenies based entirely upon phenotypes. Which of these definitions would have prevented Diogenes from presenting another animal to Plato and declaring it a man?
a. “a hairy biped with stereoscopic vision” b. “a featherless biped with fingers and a nose” c. “a biped with an upright posture and fully opposable thumbs” d. “a biped that talks and uses tools”
Represented by only one living genus, Equisetum, these seedless vascular plants have leaves in whorls
around a photosynthetic stem that is stiff and gritty because they accumulate silica in their tissues
a. mosses b. whisk ferns c. ferns d. club mosses e. horsetails
The cuticle of a plant functions primarily for ____
a. retention of water b. conduction of water and minerals c. absorption of oxygen d. photosynthesis e. structural support