Chapter 3 Flashcards
which of the following is the main component of the cell membrane?
A) phospholipids
B) carbohydrates
C) cholesterol
D) water
A
Which of the following is a characteristic of the cell membrane?
A) not permeable
B) semipermeable
C) impermeable
D) fully permeable
B
Which part of the cell membrane is usually in contact with the interstitial fluid?
A) phosphate heads or phospholipids
B) cholesterol
C) fatty acid tails
D) hydrophobic molecules
A
Which of the following is not a major function of proteins in the cell membrane?
A) acting as receptors
B) forming channels
C) anchoring cells to other structures
D) forming the entire glycocalyx
D
Which of the following best explains diffusion?
A) movement of molecules from an area of high concentration to an area of low concentration?
B) movement of molecules farther away from equilibrium
C) movement of molecules from where there are fewer of them to where there are more
D) exchange of non polar molecules for polar molecules
A
Which of the following is most likely to move through the cell membrane by facilitated diffusion?
A) small lipids
B) Na+
C) CO2
D) O2
B
which of the following is least likely to increase the rate of diffusion?
A) small molecule size
B) higher concentration of molecules
C) small concentration gradient
D) high temperature
C
Which of the following is not required for osmosis to occur?
A) selectively permeable membrane
B) water
C) concentration gradient
D) cellular energy
D
Which of the following solutions contains the most solute?
A) hypotonic
B) equilibrium
C) hypertonic
D) isotonic
C
In general, to maintain homeostasis the relationship between our intracellular and extracellular fluids should be which of the following?
A) intracellular should be hypotonic to extracellular
B) isotonic to each other
C) intracellular and extracellular should be hypertonic
D) intracellular should be hypertonic to extracellular
B
If a person is severely dehydrated, the extra cellular fluids will become hypertonic to the intercellular fluid. What do you predict will happen to the persons cells?
C
which of the following is a characteristic of cilia?
A) they are used for cellular adhesion
B) they are substantially longer than flagella, and are less common than flagella in humans
C) they increase the surface area of absorptive cells in the kidneys and intestines
D) they are whiplike, motile cellular extensions that occur in large numbers on the exposed surfaces of certain cells
D
A voltage or electrical charge across the plasma membrane
Membrane potential
