Two or more alleles of a gene present at relatively high frequencies in a population’s gene pool is known as ____
a. disruptive selection
b. sexual dimorphism
c. directional selection
d. stabilizing selection
e. balanced polymorphism
ANSWER: e
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Epinephrine blocks the contraction of muscles in the airways. Which of the other activities of epinephrine is most likely to be regulated by the same type of pathway?
A. Increased sweating. B. Stimulation of heart muscle cell contraction. C. Promotes the breakdown of glycogen in skeletal muscle cells D. Inhibition of saliva production in salivary glands E. Contraction of smooth muscle cells in blood vessels.
Red blood cells are also known as ____.
A. erythrocytes B. neutrophils C. lymphocytes D. eosinophils E. macrophages
Most biologists agree that the most important metabolic pathway of living organisms is photosynthesis because its products directly or indirectly affect most living organisms.
a. true b. false
The most worrisome results of the large-scale clearing and cultivation of land include
A) erosion and soil degradation. B) the inability to supply fresh water. C) the inability to supply enough food for growing populations. D) hurricanes.