Depolarization of the ventricles is shown as the _________________ on an EKG.
A. P wave
B. P-Q (or P-R) interval
C. QRS complex
D. Q-T interval
E. T wave
Ans: C. QRS complex
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Which of these statements is true?
a. Transport through carrier proteins occurs more rapidly than through channel proteins. b. Osmosis transports vitamins and nutrients through a cell’s plasma membrane. c. Aquaporins facilitate the transport of water through a cell’s plasma membrane. d. Ions pass through channel proteins by bonding to the protein’s inner surface.
The "tunic" of tunicate refers to:
a. a body covering b. the type of food-gathering mechanism c. muscle arrangements in the larva d. the immature stage of a true fish e. the protective cover of the brain
Some molecules are permitted to cross from one side of the plasma membrane to the other, while other molecules are not allowed to cross the membrane. Therefore the plasma membrane exhibits _____
Fill in the blank(s) with the appropriate word(s).
A pollen grain “knows” when to germinate due to
which of the following? a. differentiation upon contact with the flower b. exposure to moisture c. cell signaling pathways d. electromagnetic impulses from the flower e. none of these