Chapter 12 Practice Quiz

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Chapter 12 Practice Quiz Due Nov 2 at 11:59pm Points 10 Questions 10 Available until Nov 5 at 11:59pm Time Limit 30 Minutes Allowed Attempts 2 Take the Quiz Again Correct answers are hidden. Score for this attempt: 10 out of 10 Submitted Nov 2 at 1:35pm This attempt took 11 minutes. Question 1 1 / 1 pts
Phospholipids and glycolipids form bimolecular sheets because of (select all correct answers) the differing interaction between polar head groups with one another. the attractions between polar head groups and water. the hydrophobic effect. the presence of two hydrophobic chains. Question 2 1 / 1 pts In the movement of small molecules across a lipid bilayer, the permeability coefficient can be correlated with the flexibility of the molecule. the solubility of the molecule in a nonpolar solvent. the interaction of the molecule with the polar head groups. the size of the molecule. Question 3 1 / 1 pts Which of the following would be expected to lower the Tm for a phospholipid bilayer?
adding ions to bind to charged groups in the polar head groups. replacing a lipid containing 18-C fatty acids with one containing 16-C fatty acids. replacing a lipid containing unsaturated fatty acids with one containing saturated fatty acids. decreasing the concentration of phospholipids. Question 4 1 / 1 pts In passive transport, the energy driving the movement of materials across a membrane is provided by the concentration gradient across the membrane. nothing; there is no energy requirement for passive transport. ATP. the membrane transporter. Question 5 1 / 1 pts The Na+-K+ pump is an active transport system that
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pumps sodium ions out of the cell and potassium ions into the cell. pumps sodium ions into the cell and potassium ions into the cell. provides energy such that sodium and potassium ions can move freely in either direction. pumps sodium ions into the cell and potassium ions out of the cell. Question 6 1 / 1 pts Which of the following is NOT true regarding P-type ATPases? Their widespread presence in living organisms suggests an early evolutionary origin for P-type ATPases. All convert between different conformational states to transport ions or molecules. All use a similar mechanism involving a phosphorylated intermediate in their mechanism of action. Because of their common mechanism, they lack specificity and a given P-type ATPase can often transport different ions or molecules. Question 7 1 / 1 pts Secondary transporters can be divided into symporters and antiporters. What is the basis for this distinction?
Symporters use the energy from one molecule moving down its concentration gradient to drive the movement of a second molecule in the opposite direction against its concentration gradient while antiporters drive the movement in the same direction. Symporters use the energy from one molecule moving down its concentration gradient to drive the movement of a second molecule, while antiporters use the energy from both molecules for transport. Symporters allow the same molecule to be moved in both directions while antiporters allow it to move in only one direction. Symporters use the energy from one molecule moving down its concentration gradient to drive the movement of a second molecule in the same direction against its concentration gradient while antiporters drive the movement in the opposite direction. Question 8 1 / 1 pts Which of the following is NOT true of ion channels? Ion channels are gated, only being opened in response to specific signals. Ion channels are highly specific for their substrates, similar to pumps. Movement of ions through ion channels is more rapid than through pumps or secondary transporters. Ion channels are continually open while pumps or secondary transporters depend on an energy source to open.
Question 9 1 / 1 pts The three-dimensional structure of the potassium channel provided a rationale for the selectivity of potassium ions and the rejection of sodium ions. Which of the following is the basis for the ability of the potassium channel to discriminate between these two ions? The restriction of the channel desolvates sodium ions but not potassium ions. A restriction in the channel allows for potassium ions to be resolvated by protein ligands but is too large to effectively resolvate sodium ions. The sodium ion is too small to pass through the channel. The opening of the channel is structurally arranged such that potassium ions can bind, but is too small for sodium ions. Question 10 1 / 1 pts The three-dimensional structure of the potassium channel has also revealed the presence of two potassium ion–binding sites in the constricted region. What forces the potassium ion in the second binding site to exit the protein on the opposite side of the membrane? The two sites are so close together and overlap such that both cannot be occupied at the same time. Binding of a second potassium ion to the first site creates an electrostatic repulsion that helps to expel the potassium ion from the second site.
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Conformational changes in the channel force the potassium ion in the second site to exit the protein. The strength of binding to the second site is weaker than to the first site.

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