What substance causes yeast bread to rise?
A. alcohol
B. lactic acid
C. sugar
D. carbon dioxide
E. oxygen
Answer: D
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The classic experiments performed by Creighton and McClintock in Maize
A. provided the initial evidence for genetic recombination. B. provided evidence that genes located on the same chromosome do not assort independently. C. allowed for the establishment of the first genetic map. D. provided evidence for the physical exchange of genetic material between homologues.
Which embryonic cell layer develops into the lining of the gut in most eumetazoans?
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
The concentration of hydronium ions in a solution with a pH of 4 is how many times that of a solution with a pH of 2?
a. 2 b. 10 c. 100 d. 1,000
An explanation for the evolution of insect wings suggests that wings began as lateral extensions of the body that were used as heat dissipaters for thermoregulation. When they had become sufficiently large, these extensions became useful for gliding through the air, and selection later refined them as flight-producing wings. If this hypothesis is correct, insect wings could best be described as
A) adaptations. B) mutations. C) exaptations. D) isolating mechanisms. E) examples of natural