Polar molecules
A) have an equal distribution of electric charge.
B) are always ions.
C) have an overall negative electric charge.
D) have an unequal distribution of electric charge.
E) have an overall positive electric charge.
D
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a. anchoring junction b. cell adhesion molecule c. tight junction d. intermediate filament e. gap junction
Arthropod success cannot be attributed to which adaptation?
a. modified segments b. jointed appendages c. closed circulatory system d. sensory specialization e. specialized developmental stages
Which of the following is a likely physiological effect of caffeine ingestion?
A. decrease in blood glucose levels B. decrease in central nervous system activity C. extreme increase in diuretic effects D. release of proteins into the bloodstream E. increased metabolic rate
One way in which distributions of populations and species have been responding to climate change is by shifting
A) to lower elevations. B) toward the poles. C) toward the equator.