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TLS Online TPP Program

#Question id: 4703

Within a few weeks of treatment with the drug 3TC, a patientʹs HIV population consists entirely of 3TC-resistant viruses. How can this result best be explained?

#Section 2: Evolution

  1. HIV can change its surface proteins and resist vaccines.

  2. The patient must have become reinfected with 3TC-resistant viruses.

  3. HIV began making drug-resistant versions of reverse transcriptase in response to the drug.

  4. A few drug-resistant viruses were present at the start of treatment, and natural selection increased their frequency.

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TLS Online TPP Program

#Question id: 11249

#Section 1: Ecology

Choose the density-dependent factor that will slow population growth as population size increases.
TLS Online TPP Program

#Question id: 10640

#Section 2: Evolution

Given below is a graphical representation of plant life histories based on Grime's model in which disturbance and competition are the important factors


Which of the following options correctly represents A, B and C, respectively in the figure above?
TLS Online TPP Program

#Question id: 11774

#Section 1: Ecology

If environmental variation is common, individuals with certain life history strategies have higher fitness. An example is: __________.
TLS Online TPP Program

#Question id: 4649

#Section 2: Evolution

Which statement best describes the evolution of pesticide resistance in a population of insects?
TLS Online TPP Program

#Question id: 10249

#Section 1: Ecology

A niche is