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MB Chapter 7
Terms in this set (31)
Which of these statements describes some aspect of facilitated diffusion?
occurs through channel or transport portions in the membrane.
How does cholesterol affect membrane fluidity?
at body temp, it makes the membrane less fluid
Which of the following structural arrangements of the components in biological membrane facilitates the cell membranes property of selective premability?
Proteins embedded in two layers of phospholipids
Which of the following is correct regarding peripheral proteins?
These proteins are found only on the surface of the plasma membrane
Which of the following substances would be most likely to pass through the plasma membrane without the help of a transport protein?
non polar molecule, like hydrocarbon
The sodium-potassium pump ___________
transports sodium ions out of the cell and transports potassium ions into the cell
Which of the following processes and organelles accounts for the replacement of lipids and proteins lost from the plasma membrane?
exocytosis and smooth and rough ER
How does the "fluid mosaic model" describe the structure of the plasma membrane?
Proteins in the membrane contribute to the mosaic quality of the membrane while the lateral and rotational movements of phospholipids contribute to its fluidity
Which of the following statements about passive transport is true?
passive transport lets the solute move in either direction but the net movement of solute molecules occurs down the concentration gardient
If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?
Both cells would lose water; the red blood cell would shrivel and the plant plasma membrane would pull away from the cell wall
All cells have voltages across their membranes. This voltage is called a(n) ___________ and is often maintained by __________
membrane potential: electrogenic pumps
In facilitated diffusion, __________ proteins provide openings in the plasma membrane for substances to flow through without changing structure, and ____________ proteins allow passage of substances through the plasma membrane after undergoing a subtle change in shape
Why is energy required for active transport?
Because it moves solutes against their concentration gradient
A cell is placed into a solution and the cell shrinks. Which of the following is true regarding the solution?
the solution is hypertonic
Which of the following statements about the role of phospholipids in the structure and function of biological membranes is correct?
Phospholipids form a selectively permeate membrane
Which of the following statements concerning carbohydrates associated with the plasma membrane is correct?
membrane carbohydrates function primarily in cell-cell recognition
Which of the following plant cells would exhibit the most turgor pressure?
cell placed in hypotonic solution
Which of the following would be least likely to diffuse through a plasma membrane without the help of a transport portion
a large polar molecule
process by which a cell takes material
the process in which a cell releases a particle by enclosing the particle in a vesicle
Cell "eating" is called:
Cell drinking is called
Which cell structure exhibits selective permeability between a cell and its external environment
The internal concentration of a plant cell is .8M. To demonstrate plasmolysis it would be necessary to suspend the cell in what solution
What is true about diffusion
It is a passive process.
which of the following molecule is most likely to passively diffuse across the membrane
what is correct regarding integral proteins
have hydrophilic and hydrophobic properties
Cells A and B are the same size, shape, and temperature, but cell A is metabolically less active than cell B; cell B is actively converting oxygen to water in cellular respiration. Oxygen will diffuse more rapidly into cell __________ because __________.
B; the diffusion gradient in cell B is steeper
Which molecule is most abundant in plasma membrane
What function do carbs fulfill in plasma membrane
cell to cell recognition
What is correct difference between active transport and facilitated diffusion
active transport requires energy and facilitated diffusion doesn't
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