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TLS Online TPP Program

#Question id: 23117

Choose the correct statement of the following  
a. The nucleosome consists of approximately equal masses of DNA and histones (including H1). 
b. The four core histones are present in equal amounts in the cell.
c. H1 is half as abundant as the other histones, which is consistent with the finding that only one molecule of H1 can associate with a nucleosome.
d. One turn around the nucleosome takes 80 bp of DNA

#Unit 2. Cellular Organization
  1. a, b, & c
  2. b, c & d
  3. a, d, & c
  4. a, b, c, & d
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TLS Online TPP Program

#Question id: 12097

#Unit 10. Ecological Principles

The herbaceous plant Achillea lanulosa is widespread in the Northern Hemisphere. Phenotypic variation in the species has been extensively studied along an altitudinal gradient from sea level to over 3,000 meters. In California there is conspicuous variation in  height; alpine plants are only several centimeters tall  while  those in  the San Joaquin Valley may reach a height of 1.8 meters. Adaptation to different local environments also results in variation in physiological processes such as photosynthetic rate, resistance to cold, and the timing of dormancy.


Which of the following methods would be best to determine whether the phenotypic variation in Achillea lanulosa is due to genotypic variation?
TLS Online TPP Program

#Question id: 12098

#Unit 10. Ecological Principles

The herbaceous plant Achillea lanulosa is widespread in the Northern Hemisphere. Phenotypic variation in the species has been extensively studied along an altitudinal gradient from sea level to over 3,000 meters. In California there is conspicuous variation in  height; alpine plants are only several centimeters tall  while  those in  the San Joaquin Valley may reach a height of 1.8 meters. Adaptation to different local environments also results in variation in physiological processes such as photosynthetic rate, resistance to cold, and the timing of dormancy.

The morphological variation shown by Achillea lanulosa illustrates
TLS Online TPP Program

#Question id: 12099

#Unit 10. Ecological Principles

According to the competitive exclusion principle, two species cannot continue to occupy the same
TLS Online TPP Program

#Question id: 12100

#Unit 10. Ecological Principles

Prairie dogs once covered the expanses of the Great Plains. Their grazing made the grass more nutritious for the huge herds of bison, and a variety of snakes, raptors, and mammals   preyed on the rodents. In fact, the black- footed ferret (now endangered) specialized in prairie dog predation. Today, growing housing and agricultural developments have covered many prairie dog towns. Which of the following statements about prairie dogs is true?
TLS Online TPP Program

#Question id: 12101

#Unit 10. Ecological Principles

The sum total of an organism's interaction with the biotic and abiotic resources of its environment is called its
TLS Online TPP Program

#Question id: 12102

#Unit 10. Ecological Principles

Use the following diagram of Joseph Connell's study of barnacle distribution in Scotland to answer the following two questions


Which of the following is the most logical conclusion about the distribution of the two species of barnacle, Chthamalus and Balanus?