After forming a complex with the ribosome, mRNA interacts with a third molecule. This molecule is called
A) rRNA.
B) DNA.
C) rough ER.
D) an amino acid.
E) tRNA.
E) tRNA.
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Which is not a function of synovial fluid?
A. Nourishes osteocytes B. Lubricates articulating surfaces C. Removes wastes D. Serves as shock absorber E. Distributes stress forces across articular surfaces
____________________ are a group of hydrogen-containing substances that dissociate in solution to liberate free H+ and anions
Fill in the blank(s) with correct word
The "lub-dup" heart sounds are produced by:
A. the walls of the atria and ventricles slapping together during a contraction. B. the blood hitting the walls of the ventricles and arteries, respectively. C. the closing of the atrioventricular valves ("lub") and the closing of the semilunar valves ("dup"). D. the closing of the semilunar valves ("lub") and the closing of the atrioventricular valves ("dup").
Which of the following cells has up to 50 nuclei and a ruffled border?
A. Osteoblast B. Osteogenic cell C. Osteocyte D. Osteoclast E. Macrophage