In the simple linear regression, the intercept will equal the sample average of the outcome (Y) variable if which of the following is true?
A. sCov(X,Y) < 0
B. sCov(X,Y) = 0
C. sVar(X) > 0
D. sVar(Y) > 0
Answer: B
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Hamilton's Rule is a calculation of the strength in a population of
A. sexual selection. B. kin selection. C. natural selection. D. genetic relatedness. E. group selection.
They get carbon from the environment
b. They obtain energy from the environment. c. They make their own food. d. They provide food for others. e. They do not need gases to make food.
Over the course of evolutionary time, animal body sizes have gotten larger, yet cell sizes have not. Cells have stayed proportionally the same size to remain efficient, because
A) if cells got larger, the demand for energy and raw materials would greatly decrease. B) larger cells would become limited by the ability to move materials across the plasma membrane. C) of limitations of the composition of the plasma membrane. D) of the inability of the nucleus to produce sufficient DNA for larger cells. E) the Golgi apparatus would not be able to meet the demands of cell transport of larger cells.
When a young, vigorously growing culture of bacteria is transferred to fresh medium of different composition, the lag phase is usually short or absent.
Answer the following statement true (T) or false (F)