If a cell lacked lysosomes, it would not be able to
A) digest cellular wastes and bacteria.
B) transport water-soluble molecules.
C) synthesize lipids.
D) destroy H2O2.
E) produce enzymes.
A) digest cellular wastes and bacteria.
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RBC is the abbreviation for ________
A) Red blood cells B) Red and blue circulation C) Ruptured blood clot D) Really bad cut
When the inspiratory muscles relax, the rib cage returns to its original position as a result of
A) exhalation. B) gravity. C) elastic rebound. D) accessory muscle contraction. E) partial pressure difference.
To initiate a smooth muscle cell contraction, calcium enters the cell and binds to
A. troponin, which then activates myosin light-chain kinase. B. calmodulin, which then binds to and activates myosin light-chain kinase. C. a myosin head, which then activates calmodulin. D. myosin light-chain kinase, which then hydrolyzes ATP. E. a phosphatase, which then removes the tropomyosin blockade.
Action potentials are generated by ion movements through
A. chemically regulated gates. B. active ion pumps. C. leakage ion channels. D. voltage-regulated gates.