Gap junctions are most plentiful in
a. striated muscle.
b. the stomach.
c. smooth and cardiac muscle.
d. the brain.
e. the spinal cord.
C
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Which of the following lists the stages of embryonic development in the correct order
following fertilization?
a. zygote, morula, blastula, gastrula, embryo b. morula, blastula, gastrula, zygote, embryo c. gastrula, blastula, morula, embryo, zygote d. embryo, blastula, gastrula, morula, zygote
The typical osmolarity of body fluids in most freshwater invertebrates is
a. ~5 mOsm/L. b. ~225 mOsm/L. c. ~300 mOsm/L. d. ~1000 mOsm/L. e. ~1500 mOsm/L.
Which of the following bonds is weakest?
a. between two oxygen atoms within molecular oxygen b. between the opposite ions, sodium and chloride c. between the oxygen and hydrogens within a water molecule d. between two water molecules e. between the hydrogens within molecular hydrogen
Argentine fire ants entered the United States in the
a. 1920s. b. 1930s. c. 1940s. d. 1950s. e. 1960s.