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

Biology & Microbiology

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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

Biology & Microbiology

Too little cortisol may lead to

a. hypoglycemia. b. diabetes. c. acromegaly. d. hyperglycemia. e. increased breakdown of fats.

Biology & Microbiology

Choanoflagellates are of special interest because they resemble the collar cells in land plants

_________________ Indicate whether the statement is true or false.

Biology & Microbiology

Approximately what proportion of the radiant energy entering an ecosystem is used in photosynthesis?

a. 1% b. 4% c. 10% d. 50% e. 75%

Biology & Microbiology