The sliding-filament model of muscle contraction is described by the action of ____ pulling ____ inward
a. muscle fibers; actin filaments
b. myofilaments; sarcomeres
c. sarcomeres; Z lines
d. actin filaments; myosin filaments
e. myosin filaments; actin filaments
ANSWER: e
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A. aromatic. B. hydrophobic. C. negatively charged. D. positively charged.
Which of the following have the most efficient lungs: amphibians, mammals or birds? Explain your answer. What will be an ideal response?
Higher intakes of all of the following except ______ are associated with increased bone mass.
a. calcium. b. vitamin D. c. vitamin C. d. sodium.
The ribosome is important for catalyzing the formation of peptide bonds. Which of the following statements is true?
(a) The number of rRNA molecules that make up a ribosome greatly exceeds the number of protein molecules found in the ribosome. (b) The large subunit of the ribosome is important for binding to the mRNA. (c) The catalytic site for peptide bond formation is formed primarily from an rRNA. (d) Once the large and small subunits of the ribosome assemble, they will not separate from each other until degraded by the proteasome.