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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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?

Biology & Microbiology