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Biology 121 Unit 2 Exam Questions and Correct Answers CA$12.26   Add to cart
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Biology 121 Unit 2 Exam Questions and Correct Answers
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  • 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 ...

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  • August 13, 2024
  • 4
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • biology 121 unit 2 exam questions and correct answ
  • selectively permeable membrane allows the passage
  • phospholipid bilayer made up by the hydrophobicp

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  • BIO 121

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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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