Mammals arose as a dominant life-form after which event?
A) the Devonian extinction B) the Cambrian explosion
C) the Cretaceous extinction D) the start of the Quaternary period
Answer: C
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When blood glucose levels decrease (as between meals), what reserves are tapped first?
a. glycogen b. fats c. proteins d. steroids e. amino acids
An example of secondary succession is
A) grasses colonizing sand dunes. B) lichens colonizing a rock. C) weeds colonizing a volcanic lava flow. D) crabgrass colonizing an abandoned wheat field.
Which of the following is NOT a means of regulating gene expression?
A) Varying the rate at which messenger RNAs are translated B) Regulating how long a protein lasts in a cell C) Varying the rate at which messenger RNAs are transcribed D) Deleting genes from cells in which they are not needed E) Modifying proteins after they are synthesized
Your textbook presented the experiments of Richard Lenski and his colleagues who set up long-range experi-ments on E. coli
The experimental set up is illustrated in the figure above. In these experiments, 12 parallel experimental line-ages were created, cells from each line were periodically frozen, and the team followed the lineages for more than 50,000 generations. Why are these experiments groundbreaking? How have these experiments revolu-tionized the sorts of questions evolutionary biologists can ask? What will be an ideal response?