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TLS Online TPP Program

#Question id: 1218

Hormones are chemical substances produced in one organ that are released into the bloodstream and affect the function of a target organ. Which of the following conditions is required for the target organ to respond to a particular hormone?

#Unit 4. Cell Communication and Cell Signaling

  1. Cells in the target organ must modify their plasma membranes to allow the hormone to enter the cytoplasm.

  2. The target organ must be the same as the organ that produced the hormone.

  3. The target organ must have the opposite mating type of the organ that produced the hormone.

  4. The target organ must have receptors that recognize and bind the hormone molecule.

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TLS Online TPP Program

#Question id: 12774

#Unit 10. Ecological Principles

Which of the following can contribute to density-dependent regulation of populations?
TLS Online TPP Program

#Question id: 12775

#Unit 10. Ecological Principles

Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in  density  at  three-  to  five-year  intervals.  Which  of  the  following  represent  (a)  plausible  explanation(s)  of  these cycles?
TLS Online TPP Program

#Question id: 12776

#Unit 10. Ecological Principles

Which of the following is an incorrect statement about the regulation of populations?
TLS Online TPP Program

#Question id: 12777

#Unit 10. Ecological Principles

Which of the following is a density-independent factor limiting human population growth? 
TLS Online TPP Program

#Question id: 12778

#Unit 10. Ecological Principles

A population of white-footed mice becomes severely overpopulated in a habitat that has been disturbed by human activity. Sometimes intrinsic factors cause the population to increase in mortality and lower reproduction rates in reaction to the stress of overpopulation. Which of the following is an example of intrinsic population control?
TLS Online TPP Program

#Question id: 12779

#Unit 10. Ecological Principles

Suppose you are studying the nitrogen cycling in a pond ecosystem over the course of a year. While you are collecting data, a flock of 100 Canada geese lands and spends the night during a fall migration. What could you do to eliminate error in your study as a result of this event?