Proteins that are involved in the regulation of the cell cycle, and that show fluctuation in concentration during the cell cycle, are called ________.
Fill in the blank(s) with the appropriate word(s).
Ans: cyclins
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The compost pile temperature at which pathogens, but not thermophiles, are killed is about
A. 20-30ºC. B. 55-66ºC. C. 62-75ºC. D. 90-100ºC.
In comparing all three major muscle types, which one of the following statements best describes the differences between them?
A) Cardiac muscle can be stimulated only by nerves, whereas smooth and skeletal muscle contract spontaneously. B) Smooth and skeletal muscles appear striated, due to the arrangement of muscle filaments, whereas cardiac muscles lack these filaments. C) Only cardiac muscle is under voluntary control. D) Smooth and cardiac muscle do not fatigue, whereas skeletal does fatigue. E) Gap junctions are present in skeletal muscles, but not in other types of muscle.
Based on what you know about mammals, which of the following sentences would you predict best describes what happened in areas where marsupial and placental mammals came into contact?
a. All placental animals went extinct. b. All marsupial animals went extinct. c. The two groups mixed with minimal competition due to their niche differences. d. Most marsupial animals went extinct. e. Most placental animals went extinct.
The body's ability to absorb fluid is limited to approximately ____ per hour.
a. 1 pint b. 1 gallon c. 1 quart d. 1 ounce