In C4 plants, reactions that fix CO2 into four-carbon compounds occur in what type of cells?
a. guard cells
b. xylem cells
c. epidermal cells
d. mesophyll cells
e. bundle sheath cells
d
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The process of ____________________ equalizes the amount of X chromosome gene products in both sexes
Fill in the blank(s) with correct word
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”
Which of these acts as a countercurrent multiplier?
a. collecting duct b. glomerulus c. loop of Henle d. vasa recta
Sexual reproduction uses __________ to generate _______ gametes, which join at fertilization
A) meiosis; haploid B) mitosis; haploid C) meiosis; diploid D) mitosis; diploid E) mitosis; identical