A bacterium containing sodium ions at a concentration of 0.1 mM lives in a pond that contains sodium
ions at 0.005 mM. Evidently, sodium ions are entering the cell by:
a. active transport.
b. endocytosis.
c. diffusion.
d. facilitated diffusion.
e. osmosis.
A
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In which of the following diseases are motor
neurons destroyed?
a. polio b. amyotrophic lateral sclerosis c. Duchenne muscular dystrophy d. multiple sclerosis e. more than one of these
In what way can loss of heterozygosity lead to cancer?
What will be an ideal response?
With the extinction of the dinosaurs 65 million
years ago, multiple niches that the dinosaurs once filled opened up and allowed mammals the opportunity to evolve and exploit those niches. In other words, mammals underwent a(an)
a. sympatric speciation. b. adaptive radiation. c. exaptation. d. behavioral isolation. e. phylogenetic isolation
The letter “C” above represents
a. uterus. b. ovary. c. vagina. d. urinary bladder. e. pelvic girdle.