BIOL 253 Exam 1 Practice Questions and Answers (100% Pass)
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Course
Bio 253
Institution
Bio 253
BIOL 253 Exam 1 Practice Questions and
Answers (100% Pass)
Which of the following transport mechanisms may be utilized to move
glucose across cell membranes? - Answer️️ -Secondary active transport
and facilitated diffusion
Which of the following statements about the Na-K pump is(are) true?...
BIOL 253 Exam 1 Practice Questions and
Answers (100% Pass)
Which of the following transport mechanisms may be utilized to move
glucose across cell membranes? - Answer✔️✔️-Secondary active transport
and facilitated diffusion
Which of the following statements about the Na-K pump is(are) true? -
Answer✔️✔️-The location of the binding sites on the Na-K pump dictates
the direction of solute movement.
Examples of active transport may include __________. - Answer✔️✔️-the
movement of Na+ ions out of cells and the movement of glucose molecules
into intestinal epithelial cells
Which of the following statements about epithelial transport in the
intestines is (are) true? - Answer✔️✔️-The Na+/K+ ATPase is found only in
the basolateral membrane of intestinal epithelial cells and the movement of
Na+ ions across the apical membrane of intestinal epithelial cells is
dependent on the electrochemical gradient created by the Na+/K+ ATPase.
Which of the following statements is false with regard to
primary/secondary active transport? - Answer✔️✔️-Substances will always
move down their concentration gradient.
If a cell were to become depleted of its ATP, which type of membrane
transport would be most directly and immediately affected? - Answer✔️✔️-
Primary active transport
Energy released by the hydrolysis of ATP is used to move K+ and Na+
across cell membranes. This process is called __________. - Answer✔️✔️-
primary active transport
Substances that are going to move against their concentration gradient
(from low concentration to high concentration) will use which type(s) of
membrane transport? - Answer✔️✔️-Primary or secondary active transport
In skeletal muscle, the sarcoplasmic reticulum stores a very high
concentration of Ca++. When Ca++ is released into the cytosol of muscle to
facilitate contraction, it needs to be removed and pumped back into the
sarcoplasmic reticulum so that skeletal muscle can return to its relaxed
state. The Ca++ is moved from cytosol and pumped back into the
sarcoplasmic reticulum where its concentration is much higher. What type
of membrane transport does this represent? - Answer✔️✔️-Primary active
transport
What is similar between facilitated diffusion and primary/secondary active
transport? In both forms of transport __________. - Answer✔️✔️-a
membrane transport protein is involved
Identify which of the following is the correct definition of primary active
transport. - Answer✔️✔️-It is mediated by a protein that directly uses ATP
energy to move a substance against its concentration gradient.
If many solutes are constantly being pumped into or out of cells, why don't
the intracellular concentrations of these solutes change? - Answer✔️✔️-For
any given solute, the rate of active transport in one direction is equal to the
passive movement (leak) of the solute in the opposite direction.
Transport processes that can be saturated include __________. -
Answer✔️✔️-Primary active transport, Secondary active transport,
Facilitated diffusion, ion channel proteins
Which of the following will always be true of primary and secondary active
transport? - Answer✔️✔️-At least one substance will move against its
concentration gradient.
Which of the following statements makes an accurate comparison between
primary and secondary active transport? - Answer✔️✔️-In primary active
transport ATP is directly utilized, while in secondary active transport the
potential energy of a concentration gradient is utilized.
Transport processes that require an energy source include __________. -
Answer✔️✔️-primary active transport and secondary active transport
Which of the following molecules would not simply diffuse through cell
membranes easily? - Answer✔️✔️-Na+ ions and glucose
As the solute concentration of a solution increases, __________. -
Answer✔️✔️-the water concentration decreases and the osmotic pressure
increases
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