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TLS Online TPP Program

#Question id: 24434

Which of the following is correct order of proton-driven rotation of the c ring

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. Arg210 rotates, displacing H+ from Asp → Proton displaces Arg210 to adjacent c subunit → Proton enters half channel on P side → Displaced H+ exits on N side → c10 ring rotates, Arg210 returns to P-side half-channel.
  2. Displaced H+ exits on N side→ Proton displaces Arg210 to adjacent c subunit → Arg210 rotates, displacing H+ from Asp → Proton enters half channel on P side→ c10 ring rotates, Arg210 returns to P-side half-channel.
  3. Proton enters half channel on P side → Proton displaces Arg210 to adjacent c subunit → Arg210 rotates, displacing H+ from Asp → Displaced H+ exits on N side → c10 ring rotates, Arg210 returns to P-side half-channel.
  4. Proton enters half channel on P side → Proton displaces Arg210 to adjacent c subunit → c10 ring rotates, Arg210 returns to P-side half-channel.→ Displaced H+ exits on N side → Arg210 rotates, displacing H+ from Asp.
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TLS Online TPP Program

#Question id: 4652

#Unit 11. Evolution and Behavior

The graph depicts four possible patterns for the abundance of 3TC-resistant HIV within an infected human over time. If 3TC resistance is costly for HIV, then which plot (I—IV) best represents the response of a strain of 3TC-resistant HIV over time, if 3TC administration begins at the time indicated by the arrow?
TLS Online TPP Program

#Question id: 4653

#Unit 11. Evolution and Behavior

 If two modern organisms are distantly related in an evolutionary sense, then one should expect that
TLS Online TPP Program

#Question id: 4654

#Unit 11. Evolution and Behavior

Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?
TLS Online TPP Program

#Question id: 4655

#Unit 11. Evolution and Behavior

Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?
TLS Online TPP Program

#Question id: 4656

#Unit 11. Evolution and Behavior

Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?
TLS Online TPP Program

#Question id: 4657

#Unit 11. Evolution and Behavior

 Which of the following statements most detracts from the claim that the human appendix is a completely vestigial organ?