Which of the following statements about cells is NOT true?
a. Most cells cannot be seen without the aid of a microscope.
b. There are more kinds of eukaryotic cells than prokaryotic cells.
c. Most cells have an organized nucleus.
d. Some cells are large enough to see without magnification.
e. The plasma membrane completely isolates the cell's interior from the exterior
E
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Unicellular and simple multicellular organisms isolate and eliminate waste materials by:
A. moving the wastes into a contractile vacuole and eliminating them through exocytosis. B. filtering the wastes through specialized filters in the plasma membrane and into the extracellular space. C. secreting wastes into excretory tubules that connect to the outside of the cell. D. filtering the wastes into a collecting tubule and then selectively reabsorbing key solutes prior to excretion. E. All of the answer options are correct.
When the diaphragm __________, air moves into the lungs
a. contracts b. relaxes c. expands d. depressurizes
Muscle fatigue is a result of
a. accumulation of lactic acid. b. exhaustion of available ATP. c. reduction in lactic acid. d. failure of calcium channels to open after prolonged use. e. inactivity of muscles for prolonged periods of time.
In the section "Investigating Life: Size Matters in Fishing Frenzy", what hypothesis were the researchers testing?
A. Harvesting larger fish would increase the size of fish in future generations. B. Harvesting fish randomly would decrease the size of fish in future generations. C. Harvesting larger fish would decrease the size of fish in future generations. D. Harvesting fish randomly would increase the size of fish in future generations. E. Slot limits would decrease the size of fish in future generations.