You have isolated a cell that is unable to produce cholesterol for its cell membranes. Which of the following defects is this cell most likely to have?
A) The cell will not be able to regulate the transportation of substances into and out of the cell.
B) The cell will burst as a result of osmosis.
C) The cell will be unable to transport nutrients.
D) The cell will not be able to communicate with other cells.
E) The cell membrane will not have the correct fluidity.
Answer: E
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One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. <1,000 Daltons B. >1,000 Daltons, but <1,500 Daltons C. >1,500 Daltons, but <5,000 Daltons D. >5,000 Daltons, but <10,000 Daltons E. >10,000 Daltons
Which of the following is the formula for ATP hydrolysis?
a. ADP + Pi + free energy ? ATP + H2O b. ADP + ATP ? free energy + Pi c. ATP + H2O ? ADP + Pi + free energy d. Free energy + H2O + Pi ? ATP
Which of the following processes is the transfer of heat from a body to a fluid that passes over its
surface?
a. conduction b. radiation c. evaporation d. convection e. radiative cooling
Bromthymol blue turns yellow in the presence of carbon dioxide. This characteristic makes it possible for bromthymol blue to function as
a. a measure of volume b. an indicator c. a catalyst d. an energy source