Approximately how many ATP molecules are hydrolyzed and resynthesized each second in a typical cell?
a. 100
b. 10,000
c. 100,000
d. 10,000,000
e. 100,000,000
ANSWER: d
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Which of the following reactions is catalyzed by a ribozyme?
A. Last step in electron transport chain (reduction of O2 to form H2O). B. Attachment of amino acid to transfer RNA C. Peptide bond formation during protein synthesis D. First reaction in glycolysis (phosphorylation of glucose)
Only ____ make direct contact with brain interneurons rather than afferent neurons
a. olfactory receptors b. taste receptors c. chemoreceptors d. mechanoreceptors e. photoreceptors
What occurs in Duchenne muscular dystrophy?
a. muscle fibers break down b. motor neurons stop signaling muscle fibers c. actin filaments do not form d. myosin filaments do not form e. calcium does not leave the endoplasmic reticulum
These are the primary cellular sites for the extraction of energy from organic compounds:
1.Golgi bodies 2.ribosomes 3.mitochondria 4.lysosomes 5.endoplasmic reticula