The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________.
Fill in the blank(s) with the appropriate word(s).
Answer: water
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A reaction is
a. a reflex. b. involuntary. c. voluntary. d. both a and b.
Which of the following is characteristic of the developmental pattern referred to as mosaic
development? a. The cells of the adult are very different from each other. b. The fate of adult cells is predetermined in embryonic founder cells. c. Adult cells are richly interspersed with proteins. d. Embryonic cells have a wide range of possible developmental patterns. e. Embryos have a wide range of morphologies, but all look identical as adults.
The structure labeled 3 in Figure 35-2 is:
a. the secondary xylem.
b. formed by the division of the vascular cambium.
c. found adjacent to the pith.
d. usually referred to as wood.
e. the cork cambium.
The observation by scientists that flies preferentially mate with those of similar phenotypes illustrates random mating. Indicate whether the statement is true or false