APHY 201 Module 01 Membrane Transport Exam Questions with Correct
Answers
Question 1:
plasma membrane
Answer:
....a phospholipid bilayer that creates a barrier between the inside of a cell
(intracellular fluid) and the exterior (extracellular fluid); acts in transporting substances into or
out of the cell; externally facing proteins acts as receptors, transport proteins, and in cell-to-cell
recognition
Question 2:
fluid mosaic model of plasma membrane phospholipids arrange with
embedded proteins and cholesterol into a phospholipid bilayer to form the plasma
Answer:
....Polar, hydrophilic heads and nonpolar, hydrophobic tails of
membrane of the cell. Phospholipids and membrane proteins can move laterally within the
membrane unless held by the cytoskeleton.
Question 3:
functions of plasma membrane proteins (6)
Answer:
....transport, receptors for signal transduction, attachment
to the cytoskeleton and extracellular matrix, enzymatic activity, intercellular joining, cell-to- cell
recognition
Question 4:
interstitial fluid
Answer:
....a solution that bathes tissue cells; it is the main component of extracellular fluid; it is
found in the interstitial spaces (spaces between cells); contains thousands of substances, e.g.,
amino acids, sugars, fatty acids, vitamins, hormones, salts, waste products
Question 5:
selectively permeable
Answer:
....some molecules pass through easily; some do not (impermable); selectivity due to polarity,
molecular size, and gates/channels/carriers
, Question 6:
active membrane transport
Answer:
....energy (ATP) required; occurs only in living cell membranes; substancemoves up or against
its concentration or pressure gradient; utilizes pumps and vesicular transport
Question 7:
passive membrane transport
Answer:
....no cellular energy (ATP) required; substance moves down its concentration or pressure
gradient
Question 8:
types of passive transport
Answer:
....diffusion (includes simple diffusion, carrier- and channel-mediated facilitated diffusion,
osmosis) and filtration, dialysis
Question 9:
molecules using membrane transport
Answer:
....Ability to pass through membrane determined by lipid
solubility, solute size and shape, and electrical charge. Uncharged particles preferred to cations
(+) preferred to anions (-). Large, non-lipid soluble, and negatively charged (anions) least likely
to diffuse into cells.
Question 10:
simple diffusion
Answer:
....Substances diffuse using continual random movement of particles among one another
in a liquid or gas. Uniform spreading out of molecules due to their random intermingling and
molecular motion. E.g., oxygen, carbon dioxide, lipids, vitamins.
Answers
Question 1:
plasma membrane
Answer:
....a phospholipid bilayer that creates a barrier between the inside of a cell
(intracellular fluid) and the exterior (extracellular fluid); acts in transporting substances into or
out of the cell; externally facing proteins acts as receptors, transport proteins, and in cell-to-cell
recognition
Question 2:
fluid mosaic model of plasma membrane phospholipids arrange with
embedded proteins and cholesterol into a phospholipid bilayer to form the plasma
Answer:
....Polar, hydrophilic heads and nonpolar, hydrophobic tails of
membrane of the cell. Phospholipids and membrane proteins can move laterally within the
membrane unless held by the cytoskeleton.
Question 3:
functions of plasma membrane proteins (6)
Answer:
....transport, receptors for signal transduction, attachment
to the cytoskeleton and extracellular matrix, enzymatic activity, intercellular joining, cell-to- cell
recognition
Question 4:
interstitial fluid
Answer:
....a solution that bathes tissue cells; it is the main component of extracellular fluid; it is
found in the interstitial spaces (spaces between cells); contains thousands of substances, e.g.,
amino acids, sugars, fatty acids, vitamins, hormones, salts, waste products
Question 5:
selectively permeable
Answer:
....some molecules pass through easily; some do not (impermable); selectivity due to polarity,
molecular size, and gates/channels/carriers
, Question 6:
active membrane transport
Answer:
....energy (ATP) required; occurs only in living cell membranes; substancemoves up or against
its concentration or pressure gradient; utilizes pumps and vesicular transport
Question 7:
passive membrane transport
Answer:
....no cellular energy (ATP) required; substance moves down its concentration or pressure
gradient
Question 8:
types of passive transport
Answer:
....diffusion (includes simple diffusion, carrier- and channel-mediated facilitated diffusion,
osmosis) and filtration, dialysis
Question 9:
molecules using membrane transport
Answer:
....Ability to pass through membrane determined by lipid
solubility, solute size and shape, and electrical charge. Uncharged particles preferred to cations
(+) preferred to anions (-). Large, non-lipid soluble, and negatively charged (anions) least likely
to diffuse into cells.
Question 10:
simple diffusion
Answer:
....Substances diffuse using continual random movement of particles among one another
in a liquid or gas. Uniform spreading out of molecules due to their random intermingling and
molecular motion. E.g., oxygen, carbon dioxide, lipids, vitamins.
