In a mixture, which would be present in the least amount?
a. solvent
b. solute
c. water
d. both solvent and solute
e. both solvent and water
B
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The oldest well-documented flowering plant fossils are Archaefructus, dating to about
a. 1.5 billion years ago. b. 420 million years ago. c. 250 million years ago. d. 125 million years ago. e. 17 million years ago.
What happens when an animal cell is placed into a hypertonic solution?
A. plasmolysis B. crenation occurs C. it swells D. it is unchanged
Shivering is used by mammals to increase body heat when the hypothalamus detects a body temperature below the set point. Although the behavior involves muscles, the outcome is not movement but "wasted" energy in the form of heat. This is an example of nature reusing a body structure for an additional purpose.If the boys progressed into full-blown hypothermia, this would be a failure of which regulatory system?
A. temperature homeostasis B. glucose homeostasis C. endodermic regulation D. ectothermic regulation
An episome is
A. a plasmid that gives bacteria the ability to exchange DNA with another bacterial cell. B. a plasmid that can turn a bacteria that is harmless into a strain that can cause disease. C. a plasmid that can make bacterial cells resistant to antibiotics. D. a plasmid that gives bacteria the ability to degrade toluene. E. a plasmid that can exist either autonomously in the cytoplasm or as part of a chromosome.