A nephron consists of the ________.
A. renal corpuscle and the renal tubule
B. glomerulus, the renal tubule, and the collecting duct
C. renal corpuscle, the renal tubule, and the collecting duct
D. glomerulus and the renal tubule
Answer: A
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All of the following are epithelia of mucous membranes EXCEPT ________
A) simple columnar B) simple squamous C) stratified squamous D) pseudostratified
Action potentials at a chemical synapse
A. travel from postsynaptic membrane to presynaptic terminal. B. stop at the presynaptic terminal and are blocked on the postsynaptic membrane. C. travel from presynaptic terminal to postsynaptic membrane. D. travel from presynaptic terminal to presynaptic membrane. E. travel back and forth from presynaptic terminal to postsynaptic membrane.
The phenomenal diversity of antibodies produced by an individual is possible because
a. B-cells contain more genes than other cells of the body. b. once the gene encoding an antibody is transcribed, the mRNA is sloppily translated, in effect introducing mutations (and therefore diversity) post-translationally. c. even though they have the same number of genes as other cells of the body, virtually all of their genome is dedicated to antibody genes. d. the gene fragments encoding antibodies are cut, reshuffled and spliced during a B-cell's development, enabling innumerable amino acid sequences to be generated. e. None of these.
The ethmoid and sphenoid bones are formed by ___________
A. intramembranous ossification B. endochondral ossification