Genes for self-incompatibility usually inhibit the:a
production of pollen grains.
b. pollination.
c. growth of the pollen tube.
d. growth of the style.
e. microspore formation.
C
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Would the first cells most likely have used DNA as their genetic (information storage) molecule?
A. yes B. no C. It's difficult to know.
The sodium-potassium pump of neurons pumps
A. Na+ and K+into the cell. B. Na+ and K+ out of the cell. C. Na+ into the cell and K+ out of the cell. D. Na+ out of the cell and K+into the cell. E. Na+ and K+into the cell and H+ out of the cell through an antiport mechanism.
Along with clay, why are sand and silt needed in soil for proper plant growth?
1.Sand contains micronutrients that the plant needs for growth. 2.Sand and silt are negatively charged and thus bind nutrients in soil. 3.Sand and silt separate the clay particles to allow air in. 4.Sand and silt can expand when they absorb water, allowing moisture retention in soil.
The guppy behavior studies presented in your text, including the transfer experiments of guppies between high predation and low predation sites illustrates:
a. rapidity with which natural selection can operate. b. significant differences in behavior have evolved in populations separated by only 10,000 years. c. significant differences in behavior have evolved in populations due to predation stress. d. All of the above. e. None of the above.