The flowers of plants pollinated by night-flying bats open, secrete nectar, and release fragrance only at night. The
mechanism that controls this is called ____.
a. thigmotropism
b. heliotropism
c. phototropism
d. photoperiodism
e. circadian rhythm
ANSWER: e
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The "Anthropocene Period":
A. is so named to reflect the impact of humans on the planet. B. is Latin for "modern era." C. refers specifically to the period of time following the industrial revolution. D. is so named to reflect increasing global surface temperatures. E. refers to the period when the earliest primate ancestors appeared in the fossil record.
Extra protective behaviors toward young may have evolved from a common ancestor in evolutionary lines leading to the:
A) dinosaurs, turtles, and lizards. B) mammals, turtles, and snakes. C) crocodiles, dinosaurs, and birds. D) turtles, snakes, and lizards. E) amphibians, lizards, and fish.
Which of the following environments or actions would NOT affect the rate of an enzyme reaction
a. substrate concentration b. heating the enzyme c. pH d. cooling the enzyme e. None of the listed responses is correct
Refer to the figure above. What is the function of the AGU on the loop of the tRNA?
A) It attaches to the amino acid. B) It base pairs with a codon of mRNA. C) It stabilizes the tRNA-amino acid complex. D) It is the active site of this ribozyme.