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TLS Online TPP Program

#Question id: 7126

What is the role of stem cells with regard to the function of adult tissues and organs?

#Unit 5. Developmental Biology
  1. Stem cells are undifferentiated cells that divide asymmetrically, giving rise to one daughter that remains a stem cell and one daughter that will differentiate to replace damaged and worn out cells in the adult tissue or organ.
  2. Stem cells are embryonic cells that persist in the adult, and can give rise to all of the cell types in the body.
  3. Stem cells are determined cells that reside in fully differentiated tissues and can, when needed, differentiate to supply new cells for growth of the tissue.
  4. Stem cells are differentiated cells that have yet to express the genes and proteins characteristic of their differentiated state, and do so when needed for repair of tissues and organs.
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TLS Online TPP Program

#Question id: 12609

#Unit 10. Ecological Principles

Which of the following is an example of an ecosystem?
TLS Online TPP Program

#Question id: 12610

#Unit 10. Ecological Principles

If the Sun were to suddenly stop providing energy to Earth, most ecosystems would vanish. Which of the following ecosystems would likely survive the longest after this hypothetical disaster?
TLS Online TPP Program

#Question id: 12611

#Unit 10. Ecological Principles

Researchers in the Netherlands studied the effects of parental caregiving in European kestrels over 5 years. The researchers transferred chicks among nests to produce reduced broods (three or four chicks), normal broods (five or six),  and  enlarged  broods  (seven  or  eight).  They then measured the percentage of male and female parent birds that survived the following winter. (Both males and females provide care for chicks.) Brood Size Manipulations in the Kestrel: Effects on Offspring and Parent Survival

 
Which of the following is a conclusion that can be drawn from this graph?
TLS Online TPP Program

#Question id: 12612

#Unit 10. Ecological Principles

Which of the following pairs of reproductive strategies is consistent with energetic trade-off and reproductive success? 
TLS Online TPP Program

#Question id: 12613

#Unit 10. Ecological Principles

A population of ground squirrels has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.02. Estimate the number of individuals added to (or lost from)  population of 1,000 individuals in one year. 
TLS Online TPP Program

#Question id: 12614

#Unit 10. Ecological Principles

A small population of white-footed mice has the same intrinsic rate of increase (r) as a large population. If everything else is equal,