Which of the following will pass through a cell membrane most easily?
small polar molecules
small nonpolar molecules
large polar molecules
large nonpolar molecules
large neutral molecules
small nonpolar molecules
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In sickle cell anemia, the defective hemoglobin differs from the normal hemoglobin by
A. the color of the pigment. B. the size of the molecule. C. a single amino acid substitution. D. the total number of amino acids. E. the type of blood cell it is found in.
Helper T cells secrete
A) cytokines. B) antibodies. C) antigens. D) immunoglobulins.
A nucleotide is constituted of
a. a five carbon sugar, a nitrogenous acid, and a phosphate group. b. a six carbon sugar, a nitrogenous base, and a phosphate group. c. a five carbon sugar, a nitrogenous base, and a phosphate group. d. a six carbon sugar, a nitrogenous acid, and a phosphate group. e. a four carbon sugar, a nitrogenous acid, and a phosphate group
Virus-like particles ____
a. carry viral DNA b. are infectious c. will elicit an immune response d. are produced by cancer cells e. cause cervical cancer