Oil and natural gas are predominantly composed of the remains of
a. multicellular animals.
b. phytoplankton.
c. fungi.
d. multicellular plants.
e. gelatinous zooplankton.
B
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The primary reason surplus carbohydrates in plants are stored as starch is because:
A. they would otherwise be utilized as energy sources even if such energy was not needed at that time. B. the space they occupy as carbohydrates is needed for other macromolecules. C. energy is needed in the nucleus, and only starch is capable of being transported into the nucleus. D. leaving them as individual monosaccharides would upset the osmotic balance of the cell.
Analysis of the small subunit rRNAs from all organisms in the three current domains suggests that
A. all modern and extinct organisms on earth arose from a common ancestor. B. the eukaryotes arose from prokaryotes. C. the Archaea are more closely related to bacteria than eukaryotes. D. the prokarytoes, archaea, and eukaryotes are not related.
Members of a population have similar
a. phenotypes. b. morphological traits. c. physiological traits. d. behavioral traits. e. all of these
The ____ nervous system consists of the brain and spinal cord and the ____ nervous system consists of nerves.
A. sensory; motor B. central; peripheral C. peripheral; sensory D. sensory; central