The shape of a DNA molecule is most like
A) a set of railroad tracks.
B) a wooden ladder.
C) a twisted rope ladder.
D) beads on a string.
Answer: C
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A person with a glucagon deficiency would most likely have difficulty
a. producing enough urine to remove waste products. b. synthesizing glycogen in the liver. c. allowing circulating glucose to enter cells. d. producing insulin after a meal. e. keeping up blood sugar between meals.
The idea that Earth orbits the sun is referred to as ____ of the solar system, because of the scientist who first proposed
it.
a. the Galilean theory b. Newton’s model c. Einstein’s theory d. the Copernican model e. Darwin’s theory
Divergence may lead to
a. genetic drift. b. speciation. c. genetic equilibrium. d. gene flow. e. all of these.
An individual mixotroph loses its plastids, yet continues to survive. Which of the following most likely accounts for its continued survival?
A) It relies on photosystems that float freely in its cytosol. B) It must have gained extra mitochondria when it lost its plastids. C) It engulfs organic material by phagocytosis or by absorption. D) It has an endospore.