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TLS Online TPP Program

#Question id: 4023

Which of the following is a fundamental difference between gene regulation in bacteria compared with eukaryotes?

#Unit 3. Fundamental Processes

  1. In bacteria, but not eukaryotes, there is a specific sequence that specifies where RNA polymerase binds and initiates transcription.

  2. In eukaryotes, but not bacteria, transcription can be influenced by how effectively the DNA sequence of a promoter region interacts with histone octamers.

  3. Transcription regulation is the most widespread form of control of gene expression in bacteria but not in eukaryotes.

  4. Gene regulation is readily reversible in eukaryotes but not bacteria.

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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?
TLS Online TPP Program

#Question id: 12780

#Unit 10. Ecological Principles

The producers in aquatic ecosystems include organisms in which of the following groups?