Chapter 05 – Membranes
Chapter 05
Membranes
Multiple Choice Questions
1. The lipid layer that forms the foundation of cell membranes is primarily composed of
molecules called __________.
2. While water continually orients phospholipids into a lipid bilayer, it does not fix the lipids
permanently into position. Thus, the bilayer is considered to be _______.
Chapter 05 – Membranes
3. What is the net movement of substances to regions of lower concentration called?
4. Osmosis is the diffusion of water across a membrane in response to the concentration of
one or more of the ______.
5. Which type of proteins is embedded in the cell membrane in both active transport and
facilitated transport?
Chapter 05 – Membranes
6. Osmosis occurs as water can cross the lipid bilayer through specialized channels for water
movement called ________________.
7. The plasma membrane is a thin sheet of lipid embedded with
8. Membrane proteins are not very soluble in water, because they possess long stretches of
non-polar amino acids that are
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9. If a cell has the same concentration of dissolved molecules as its outside environment, the
cell’s condition is referred to as being
10. A type of transport of a solute across a membrane, up its concentration gradient, using
protein carriers driven by the expenditure of chemical energy is known as
Check All That Apply Questions
Chapter 05 – Membranes
11. The cell’s plasma membrane mediates which of the following transactions with the
environment? Choose all that apply.
Multiple Choice Questions
12. How are the tails and heads of membrane phospholipids oriented in their environment?
Chapter 05 – Membranes
13. The fluid nature of the membranes is attributed to a lateral movement of
14. On the outer surface of the plasma membrane there are marker molecules that identify the
cell type. Often these molecules are
15. Which of the following protein classes are not found as membrane proteins?
Chapter 05 – Membranes
16. The part of a membrane protein that extends through the phospholipid bilayer is primarily
composed of amino acids that are
17. Red blood cells are bi-concave. Their shape is determined by interior proteins anchored to
the membrane termed
18. The movement of substances to regions of lower concentration is called
Chapter 05 – Membranes
19. If two solutions have unequal concentrations of a solute, the solution with the lower
concentration is called
20. In bacteria, fungi, and plants the high internal pressure generated by osmosis is
counteracted by the mechanical strength of their
21. The actual transport of protons by the proton pump is mediated by a transmembrane
protein which undergoes a change in its
Chapter 05 – Membranes
22. The process often referred to as “cellular eating” is
23. Carrier-mediated transport is also called
24. Osmosis can only occur if water travels through the
Chapter 05 – Membranes
25. The type of movement of molecules that is specific and passive, and which becomes
saturated if all of the protein carriers are in use is
26. The type of movement that is specific and requires carrier molecules and energy is
27. In a single sodium-potassium pump cycle, ATP is used with the result that
Chapter 05 – Membranes
28. The accumulation of amino acids and sugars in animal cells can occur through
29. Cholesterol functions in the plasma membrane to
30. A phospholipid molecule has a polar and a nonpolar end. Because of this, water
molecules form
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31. The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
32. Membrane proteins serve many functions. One of the functions is transportation of
substances across the membrane. If a cell biologist placed cells into an environment in which
a chemical has been added that blocks the function of only carrier proteins, the process that
will be affected is
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Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
•
What key words does the question contain and what do they mean?
Gather Content
•
What do you know about transport of molecules across membranes? How does it relate to
the question?
Consider Possibilities
•
What other information is related to the question? Which information is most useful?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 05 – Membranes
33. For the process of diffusion to occur, molecules must
34. Facilitated diffusion is an important method for cells in obtaining necessary molecules
and removing other ones. Requirements for facilitated diffusion include
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35. A research laboratory is attempting to collect the content of human red blood cells. The
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Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
•
What key words does the question contain and what do they mean?
Gather Content
•
What do you know about osmotic concentration? How does it relate to the question?
Consider Possibilities
•
What other information is related to the question? Which information is most useful?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 05 – Membranes
36. One day during the summer you and some friends make ice cream using an electric ice
cream maker. To get the ice cream to form, a mixture of salt and ice is packed around the ice
cream maker. A few days later you notice a yellow circle of dead grass where the ice cream
maker had been placed. You hypothesize that some of the salt and ice mixture spilled onto the
grass and ___.
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Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
•
What key words does the question contain and what do they mean?
Gather Content
•
What do you know about osmotic concentration? How does it relate to the question?
Consider Possibilities
•
What other information is related to the question? Which information is most useful?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
•
Did your problem-solving process lead you to the correct answer? If not, where did the
process break down or lead you astray? How can you revise your approach to produce a
more desirable result?
Chapter 05 – Membranes
37. What is the main component of an animal cell membrane?
Chapter 05 – Membranes
38. A scientist performs an experiment in which they create an artificial cell with a
selectively permeable membrane through which only water can pass. They inject a 5M
solution of glucose into the cell and then place the cell into a beaker of water. After an hour,
what effect do you expect to observe?