Bioluminescence is:
A. the production and emission of light by organisms
B. the capture of moonlight for nocturnal photosynthesis
C. the absorption of light by pigments for transfer to chlorophyll a
D. the ability to detect and move away from sources of light
E. the ability to detect and move toward sources of light
A. the production and emission of light by organisms
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Abscisic acid is an important signal, transported from roots to the stem and leaves during times of water stress, that prevents:
A. additional auxin production B. ethylene buildup in the stems C. leaf drop D. phototropism E. stomatal opening
Which of these statements is false concerning
covalent bonds? a. Atoms share electrons. b. Molecules may possess many covalent bonds. c. Water contains polar covalent bonds. d. Covalent bonds may be “double bonds.” e. In polar covalent bonds, electrons are shared equally.
“Z” stands for blood type
a. A. b. B. c. AB. d. O. e. any of these.
Imaginal discs are:a
found in mammalian cells and control gene activation in mature somatic cells. b. paired groups of undifferentiated cells that are precursors of adult structures in Drosophila. c. found in plant cells and assist in the development of the flower. d. part of the salivary gland of Drosophila. e. found in Drosophila ovary cells and represent inactivated X chromosomes.