A hormone used by competitive athletes to increase the oxygen-carrying capacity of their blood is
_____________.
A. oxytocin D. norepinephrine
B. glucagon E. serotonin
C. erythropoietin
C
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Four of the five answers listed below are types of selection exhibited by nature. Select the exception
a. artificial b. disruptive c. stabilizing d. directional e. sexual
A plant pathologist, a scientist who studies plant diseases, examines a tree that has burnt leaves, is mineral deficient,
and has several diseases. The plant pathologist concludes the tree’s symptoms are most likely the direct result of ____.
a. biological magnification b. desertification c. ozone depletion d. acid rain e. deforestation
What is meant by the "multiple hit" model of cancer?
A) Most cancer-causing mutations are passed on to future generations. B) Most cancers occur in many different tissues simultaneously. C) Multiple mutations are required to cause most forms of cancer. D) A person gets cancer only if both of his or her parents had cancer.
Protein molecules are polymers (chains) of _____.
A. DNA molecules B. fatty acid molecules C. sucrose molecules D. amino acid molecules E. purines and pyrimidines