Which gametes can a RrYy plant produce? Select one:
a. RrYy
b. R or r
c. RY or ry
d. Rr or Yy
e. RY, Ry, rY, or ry
e. RY, Ry, rY, or ry
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A population of T cells has been stimulated to proliferate in response to a particular antigen. A sample of 1000 cells is examined microscopically, revealing that 200 of these cells are in the various stages of mitosis. Of the remaining 800 in interphase, 400 have x amount of DNA, 250 have 2x, and the remaining 150 have amounts somewhere between x and 2x. Additional analysis reveals that the G2
phase of the cell cycle lasts 2 hours. What is the total length of the cell cycle? A) 2.5 hours B) 4 hours C) 6.4 hours D) 8 hours E) 13.3 hours
Too little cortisol may lead to
a. hypoglycemia. b. diabetes. c. acromegaly. d. hyperglycemia. e. increased breakdown of fats.
Choanoflagellates are of special interest because they resemble the collar cells in land plants
_________________ Indicate whether the statement is true or false.
Approximately what proportion of the radiant energy entering an ecosystem is used in photosynthesis?
a. 1% b. 4% c. 10% d. 50% e. 75%