Biology 121 Unit 2 Exam Questions and Correct Answers
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Course
BIO 121
Institution
BIO 121
Selectively Permeable membrane allows the passage of some materials but not others
Phospholipid Bilayer made up by the hydrophobic/philic "tails" and "heads"
Functions of Membrane Proteins transport enzymes receptors recognition adhesion attachment to the cytoskeleton
Diffusion the net movement ...
Biology 121 Unit 2 Exam Questions and
Correct Answers
Selectively Permeable ✅membrane allows the passage of some materials but not
others
Phospholipid Bilayer ✅made up by the hydrophobic/philic "tails" and "heads"
Functions of Membrane Proteins ✅transport
enzymes
receptors
recognition
adhesion
attachment to the cytoskeleton
Diffusion ✅the net movement of particles from an area of higher concentration to an
area of lower concentration
What can diffuse past cell membranes? ✅gases
small nonpolar molecules (alcohol)
water
Osmosis ✅the diffusion of water across a selectively permeable membrane
Isotonic to cells ✅0.9% NaCl
no net movement of water
Hypertonic to cells ✅10% NaCl
water leaves the cell
Crenation ✅shriveling of RBCs in a hypertonic solution
Hemolysis ✅bursting of RBCs in a hypotonic solution
Plasmolysis ✅shriveling of a plant cell in a hypertonic solution; central vacuole loses
water
Turgid ✅when central vacuole is full of water
Carrier (protein-mediated) Transport ✅transport proteins in the cell membrane move
materials across it
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