The human body temperature is relatively constant. Which is a feedback mechanism that helps the human body maintain its normal temperature in a cold environment?
A. Water is released from the skin.
B. Muscles shake in small movements.
C. The rate of heart beats slows.
D. The lungs take in additional air.
Answer: B. Muscles shake in small movements.
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A species is found to exist in one of three colors. Assuming an epistatic interaction, how many genes would be
involved? a. zero b. one
c. two d. three e. six
Which of the following disorders is classified under the general term glomerulonephritis?
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Which organism obtains energy by removing electrons from inorganic molecules?
A. Chemoautotroph B. Chemoheterotroph C. Photoautotroph D. Photoheterotroph E. Electroautotroph