TLS Online TPP Program

#Question id: 2237


Glucose enters erythrocytes via a GLUT-1 uniporter. As the levels of glucose in the bloodstream decrease between meals, what happens to the glucose in the cells?

#Unit 2. Cellular Organization
  1. Glucose leaves the cell through the GLUT-1 uniporter, traveling down the new concentration gradient.

  2. Glucose remains in the cell because uniporters can only transport in one direction.

  3. Glucose remains in the cell because the GLUT-1 uniporters are gated and the gates close at low glucose concentrations.

  4. Glucose remains in the cell because it has been phosphorylated and no longer has affinity for the GLUT-1 uniporter.

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TLS Online TPP Program

#Question id: 12468

#Unit 10. Ecological Principles

If the sex ratio in a population is significantly different from 50:50, then which of the following will always be true? 

TLS Online TPP Program

#Question id: 12469

#Unit 10. Ecological Principles

A population of strictly monogamous swans consists of 40 males and 10 females. What is the effective population size (ne) for this population?

TLS Online TPP Program

#Question id: 12470

#Unit 10. Ecological Principles

An ecologist recorded 12 white-tailed deer, Odocoileus virginianus, per square mile in one woodlot and 20 per square mile on another woodlot. What was the ecologist comparing?

TLS Online TPP Program

#Question id: 12471

#Unit 10. Ecological Principles

To measure the population density of monarch butterflies occupying a particular park, 100 butterflies are captured, marked with a small dot on a wing, and then released. The next day, another 100 butterflies are captured, including the recapture of 20 marked butterflies. One would estimate the population to be

TLS Online TPP Program

#Question id: 12472

#Unit 10. Ecological Principles

During the spring, you are studying the mice that live  in  a  field  near your home. There are lots  of  mice in  this field, but you realize that you rarely observe any reproductive females. This most likely indicates

TLS Online TPP Program

#Question id: 12473

#Unit 10. Ecological Principles

You are observing a population of lizards when you notice that the number of adults has increased and is higher than previously observed. One explanation for such an observation would include