The dinosaurs (other than birds) went extinct during the asteroid impact at the K-P boundary because they were poorly adapted to their ecological niches.

a. true
b. false


Answer: b. false

Biology & Microbiology

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A positive allosteric effector will ________ the activity of an enzyme while a negative effector will ________ the activity.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Taq polymerase is commonly used in PCR reactions because it ____

a. keeps the primers from annealing to the DNA b. makes fewer DNA replication errors than other DNA polymerases c. is a heat-stable DNA polymerase d. is more efficient at replicating DNA than other DNA polymerases e. helps the primers anneal to the correct DNA sequence

Biology & Microbiology

What percentage of the species that have ever lived have become extinct?

a. 1 percent b. 9 percent c. 50 percent d. 75 percent e. 99 percent

Biology & Microbiology

Reproductive isolation often occurs due to

a. geographic separation. b. species incompatibility. c. mutation. d. genetic drift. e. natural selection.

Biology & Microbiology