Which of the following represents a molecule characterized by polar covalent bonding?

A) CH4 B) H2 C) NaCl D) H2O E) O2


D

Biology & Microbiology

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Which of the following molecules are absorbed from the lumen of the small intestine into epithelial cells through simple diffusion?

A) monosaccharides B) disaccharides and trisaccharides C) lipids D) amino acids

Biology & Microbiology

Which structure stores feces until they can be eliminated?

A) rectum B) appendix C) anus D) colon

Biology & Microbiology

Which of the following subatomic particles has appreciable mass and lacks a charge?

a. neutron b. element c. electron d. proton e. molecule

Biology & Microbiology

A drug that specifically inhibits voltage-gated calcium channels would most directly inhibit

A) depolarization of nerve cell membranes.
B) repolarization after depolarization of nerve cell membranes.
C) hyperpolarization of nerve cell membranes.
D) presynaptic neurotransmitter release.
E) postsynaptic receptor signal response.

Biology & Microbiology