BIOL 253 Exam 1 Questions & Answers |
100% Correct Answers | Verified | Latest
2024 Version
Which of the following transport mechanisms may be utilized to move glucose across cell membranes? -
✔✔Secondary active transport and facilitated diffusion
Which of the following statements about the Na-K pump is(are) true? - ✔✔The location of the binding
sites on the Na-K pump dictates the direction of solute movement.
Examples of active transport may include __________. - ✔✔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? - ✔✔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? -
✔✔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? - ✔✔Primary active transport
Energy released by the hydrolysis of ATP is used to move K+ and Na+ across cell membranes. This
process is called __________. - ✔✔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? - ✔✔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? - ✔✔Primary active transport
What is similar between facilitated diffusion and primary/secondary active transport? In both forms of
transport __________. - ✔✔a membrane transport protein is involved
Identify which of the following is the correct definition of primary active transport. - ✔✔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? - ✔✔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 __________. - ✔✔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? - ✔✔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? - ✔✔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 __________. - ✔✔primary active transport
and secondary active transport
Which of the following molecules would not simply diffuse through cell membranes easily? - ✔✔Na+
ions and glucose
100% Correct Answers | Verified | Latest
2024 Version
Which of the following transport mechanisms may be utilized to move glucose across cell membranes? -
✔✔Secondary active transport and facilitated diffusion
Which of the following statements about the Na-K pump is(are) true? - ✔✔The location of the binding
sites on the Na-K pump dictates the direction of solute movement.
Examples of active transport may include __________. - ✔✔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? - ✔✔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? -
✔✔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? - ✔✔Primary active transport
Energy released by the hydrolysis of ATP is used to move K+ and Na+ across cell membranes. This
process is called __________. - ✔✔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? - ✔✔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? - ✔✔Primary active transport
What is similar between facilitated diffusion and primary/secondary active transport? In both forms of
transport __________. - ✔✔a membrane transport protein is involved
Identify which of the following is the correct definition of primary active transport. - ✔✔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? - ✔✔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 __________. - ✔✔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? - ✔✔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? - ✔✔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 __________. - ✔✔primary active transport
and secondary active transport
Which of the following molecules would not simply diffuse through cell membranes easily? - ✔✔Na+
ions and glucose
