Multiple Choice
Which molecule most easily diffuses across a biological membrane's lipid bilayer, without help of a protein?
2. Cell Chemistry & Cell Components
Introduction to Membrane Transport
Back2. Cell Chemistry & Cell Components
Introduction to Membrane Transport
- Multiple Choice
According to the map above, what kind of large molecule transport is also called the process of cell 'eating'?
- Open QuestionFill in the following concept map to review the processes by which molecules move across membranes.
- Open QuestionAdd labels to the figure that follows, which illustrates some molecules that can and cannot pass through cell membranes unaided.
- Open QuestionWhich of the following processes includes all the others?a. osmosisb. diffusion of a solute across a membranec. passive transportd. transport of an ion down its electrochemical gradient
- Open QuestionWhich of the following groups of amino acid residues (see Ch. 3, Figure 3.2) would likely be found in the portion that crosses the lipid bilayer? a. acidicb. basicc. polar unchargedd. nonpolar
- Open QuestionHow do the components and structure of cell membranes relate to the functions of membranes?
- Open Question
Match the term with its appropriate definition.
_____Osmosis
_____Secondary active transport
_____Exocytosis
_____Phagocytosis
_____Simple diffusion
_____Primary active transport
_____Pinocytosis
_____Facilitated diffusion
a. Type of endocytosis in which a large particle is ingested
b. Transport across the plasma membrane against the concentration gradient via direct use of energy from ATP
c. Passive movement of solute across the plasma membrane
d. Movement of solvent from a solution of lower solute concentration to a solution of higher solute concentration
e. Passive movement of solute across the plasma membrane via a channel or carrier protein
f. Type of endocytosis in which ECF is brought into the cell in a protein-coated pit
g. Release of large substances from the cell through a vesicle
h. Transport of a substance across the plasma membrane against its concentration gradient using the energy from the 'downhill' movement of another substance
- Open Question
Epithelial cells of the kidneys have pumps that drive the transcellular transport of sodium ions.
b. The movement of sodium ions drives the transcellular transport of water. Explain why water follows sodium. (Connects to Chapter 3)