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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: 1439

#Unit 4. Cell Communication and Cell Signaling

Indirect-acting carcinogens are those that:
TLS Online TPP Program

#Question id: 33312

#Unit 1. Molecules and their Interaction Relevant to Biology

Identify the plot shown
TLS Online TPP Program

#Question id: 31403

#Unit 6. System Physiology – Plant
TLS Online TPP Program

#Question id: 13143

#Unit 10. Ecological Principles

The Norway rat (Rattus Norvegicus), a widespread pest, was controlled for about a decade by the anticoagulant warfarin. This chemical substance, placed in food pellets, is absorbed by the intestinal tract and inhibits the clotting of blood. After a population decline for about 10 years, rat populations increased and stabilized. In one European population, as illustrated in the graph below, the percentage of rats resistant to warfarin has remained fairly stable over a number of years.

Resistance to warfarin is governed by a dominant autosomal gene, R. More than 15 percent of the resistant animals are heterozygous at this locus (Rr). The table below indicates the response to warfarin and relative reproductive fitness of individuals that are homozygous or heterozygous for the dominant gene (R). The RR individuals have a 20-fold increase in vitamin K requirement over individuals.

Fitness is a measure of the reproductive success of a particular genotype. The highest fitness is 1.00.
In a population where warfarin is no longer applied, the expectation is that the
TLS Online TPP Program

#Question id: 8947

#Unit 9. Diversity of Life Forms

Organisms that are neither coelomate nor pseudocoelomate should, apart from their digestive systems, have bodies that