TLS Online TPP Program

#Question id: 4619


Within six months of effectively using methicillin to treat S. aureus infections in a community, all new S.aureus infections were caused by MRSA. How can this best be explained?

#Section 2: Evolution
  1. A patient must have become infected with MRSA from another community.

  2.  In response to the drug, S. aureus began making drug-resistant versions of the protein targeted by the drug.

  3. Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.

  4. S. aureus evolved to resist vaccines.

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TLS Online TPP Program

#Question id: 15725

#Section 2: Evolution

Alfred Russel Wallace (1823–1913), who was collecting specimens in the Malay Archipelago, had independently conceived that

TLS Online TPP Program

#Question id: 4598

#Section 2: Evolution

Fossils of Thrinaxodon, a species that lived during the Triassic period, have been found in both South Africa and Antarctica. Thrinaxodon had a reptile-like skeleton and laid eggs, but small depressions on the front of its skull suggest it had whiskers and, therefore, fur. Thrinaxodon may have been warm-blooded. The fossils of Thrinaxodon are consistent with the hypothesis that ________.

TLS Online TPP Program

#Question id: 4606

#Section 2: Evolution

Which of the following evidence most strongly supports the common origin of all life on Earth? All organisms ________.

TLS Online TPP Program

#Question id: 4579

#Section 2: Evolution

About which of these did Darwin have a poor understanding?

TLS Online TPP Program

#Question id: 10617

#Section 2: Evolution

Suppose you discovered a new species of animal about which you know only two facts: Large clutch size and no parental care. Which of the following strategies is most likely to be true for this species?

TLS Online TPP Program

#Question id: 4930

#Section 2: Evolution

Which of the following is the correct sequence of events in the origin of life?

I. Formation of protocells

II. Synthesis of organic monomers

III. Synthesis of organic polymers

IV. Formation of DNA-based genetic systems