TLS Online TPP Program

#Question id: 7222


During development of sea urchin, The fates of the different cell layers are determined by which process?

#Unit 5. Developmental Biology
  1. The large micromeres are conditionally specified. These conditionally specified large micromeres are now able to produce paracrine and juxtacrine factors that autonomously specify the fates of their neighbors.
  2. The large micromeres are autonomously specified. These autonomously specified large micromeres are now able to produce paracrine and juxtacrine factors that conditionally specify the fates of their neighbors.
  3. All micromeres are autonomously specified during early development.
  4. All micromeres are conditionally specified during early development.
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TLS Online TPP Program

#Question id: 11997

#Unit 10. Ecological Principles

Which statement best contrasts environmentalism with ecology?

TLS Online TPP Program

#Question id: 11998

#Unit 10. Ecological Principles

Of the following examples of ecological effect leading to an evolutionary effect, which is most correct? 

TLS Online TPP Program

#Question id: 11999

#Unit 10. Ecological Principles

Rachel Carson would most likely have endorsed which of the following statements?

TLS Online TPP Program

#Question id: 12000

#Unit 10. Ecological Principles

The graph below shows  the  growth  rates  of  populations  of  bacteria  that  have  evolved  for  many  generations  at different culture temperatures (25°C, 30°C, and 35°C). Each population grows over only a limited range of temperatures (its thermal niche), which are bounded by its critical thermal limits. Within this range, growth rate increases with temperature up to a maximal value and then declines rapidly with increasing temperature. Growth rates are known to be the major determinant of fitness for these bacteria.

Which of the following is true concerning the thermal dependence of growth rate   between 25°C and 30°C in these populations?

TLS Online TPP Program

#Question id: 12001

#Unit 10. Ecological Principles

The  graph  below  shows  the  growth  rates  of  populations  of  bacteria  that  have  evolved  for  many  generations  at different culture temperatures (25°C, 30°C, and 35°C). Each population grows over only a limited range of temperatures (its thermal niche), which are bounded by its critical thermal limits. Within this range, growth rate increases with temperature up to a maximal value and then declines rapidly with increasing temperature. Growth rates are known to be the major determinant of fitness for these bacteria.


Which population has the highest fitness at 25°C ? 

TLS Online TPP Program

#Question id: 12002

#Unit 10. Ecological Principles

Which of the following can be correctly concluded from this experiment?