Which mammalian lineage includes the opossum and the kangaroo among its living members?
a. Marsupialia
b. Haplorhini
c. Rodentia
d. Strepsirhini
Ans: a. Marsupialia
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Consider the following experiment. First, large populations of two mutant strains of Escherichia coli are mixed, each requiring a different, single amino acid. After plating them onto a minimal medium, 45 colonies grew
Which of the following may explain this result? A) The colonies may be due to back mutation (reversion). B) The colonies may be due to recombination. C) Either A or B is possible. D) Neither A nor B is possible.
True or False: amino acids with hydrophobic side chains are most often found buried in the interior of folded proteins
A. true B. false
Natural selection that shifts the adaptation of an entire population is known as ____
a. stabilizing selection b. directional selection c. disruptive selection d. artificial selection e. sexual selection
Which of the following is a relationship between organisms that cannot evolve into a mutualistic relation-ship?
a. parasite–host interaction b. predator–prey interaction c. neutral interaction d. none; any interaction can serve as a precursor