Practice Questions

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

HIV can change its surface proteins and resist vaccines.
The patient must have become reinfected with 3TC-resistant viruses.
HIV began making drug-resistant versions of reverse transcriptase in response to the drug.
A few drug-resistant viruses were present at the start of treatment, and natural selection increased their frequency.

More Questions

TLS Online TPP Program

#Question id: 11178

#Section 1: Ecology

At low population densities

TLS Online TPP Program

#Question id: 11179

#Section 1: Ecology

The defended portion of a home range is called the

TLS Online TPP Program

#Question id: 11180

#Section 1: Ecology

In contrast to herbivores,

TLS Online TPP Program

#Question id: 11181

#Section 1: Ecology

Among populations of birds, individuals without territories are

TLS Online TPP Program

#Question id: 11182

#Section 1: Ecology

In general

TLS Online TPP Program

#Question id: 11183

#Section 1: Ecology

Which of the following is an example of a density-independent mechanism?