BIO 1201 GREGG EXAM 2 2025 QUESTIONS
AND ANSWERS.
1. Transport proteins - correct answer-are responsible for controlling
passage across the membrane
2. Fluid mosaic model - correct answer-the membrane is a mosaic of
protein molecules bobbing in a fluid bilayer of phospholipids
3. Fatty acid tails - correct answer-nonpolar, hydrophobic
4. Fatty acid heads - correct answer-hydrophilic, polar
5. Periphial proteins - correct answer-bound to the surface of the
membrane
6. Integral proteins - correct answer-penetrate the hydrophobic core (ones
that span the membrane are transmembrane protiens
,7. How do cells recognize each other? - correct answer-by binding to
molecules, often containing carbohydrates, on the extracellular surface
of the plasma membrane
8. Glycolipids - correct answer-membrane carbohydrates that are
covalently bonded to lipids.
9. Hypdrophobic - correct answer-molecules such as hydrocarbons that
can dissolve in the lipid bilayer and pass through the membrane rapidly
10. Hydrophilic - correct answer-molecules that don't cross the
membrane easily (ions and polar molecules)
11. Transport proteins - correct answer-allow passage of hydrophilic
substances across the membrane
12. Carrier proteins - correct answer-bind to molecules and change
shape to shuttle them across the membrane
13. Passive transport - correct answer-the diffusion of a substance
across a membrane with no energy investment
, 14. Diffusuion - correct answer-spreading out of particles away from each
other, from an area of high concentration to an area of low
concentration. (move to where space is available)
15. Concentation gradient - correct answer-substances diffuse from high
concentration----> low concentration
16. Osmosis - correct answer-diffusion of water through a selectively
permeable membrane
17. Isotonic - correct answer-when the concentration of two solutions is
the same (no net movement)
18. Hypertonic - correct answer-cell losses water and shrivils
19. Hypertonic - correct answer-cell gains water and expands
20. In a plant cell water moves in and out affecting the size of what? -
correct answer-central vacuole
AND ANSWERS.
1. Transport proteins - correct answer-are responsible for controlling
passage across the membrane
2. Fluid mosaic model - correct answer-the membrane is a mosaic of
protein molecules bobbing in a fluid bilayer of phospholipids
3. Fatty acid tails - correct answer-nonpolar, hydrophobic
4. Fatty acid heads - correct answer-hydrophilic, polar
5. Periphial proteins - correct answer-bound to the surface of the
membrane
6. Integral proteins - correct answer-penetrate the hydrophobic core (ones
that span the membrane are transmembrane protiens
,7. How do cells recognize each other? - correct answer-by binding to
molecules, often containing carbohydrates, on the extracellular surface
of the plasma membrane
8. Glycolipids - correct answer-membrane carbohydrates that are
covalently bonded to lipids.
9. Hypdrophobic - correct answer-molecules such as hydrocarbons that
can dissolve in the lipid bilayer and pass through the membrane rapidly
10. Hydrophilic - correct answer-molecules that don't cross the
membrane easily (ions and polar molecules)
11. Transport proteins - correct answer-allow passage of hydrophilic
substances across the membrane
12. Carrier proteins - correct answer-bind to molecules and change
shape to shuttle them across the membrane
13. Passive transport - correct answer-the diffusion of a substance
across a membrane with no energy investment
, 14. Diffusuion - correct answer-spreading out of particles away from each
other, from an area of high concentration to an area of low
concentration. (move to where space is available)
15. Concentation gradient - correct answer-substances diffuse from high
concentration----> low concentration
16. Osmosis - correct answer-diffusion of water through a selectively
permeable membrane
17. Isotonic - correct answer-when the concentration of two solutions is
the same (no net movement)
18. Hypertonic - correct answer-cell losses water and shrivils
19. Hypertonic - correct answer-cell gains water and expands
20. In a plant cell water moves in and out affecting the size of what? -
correct answer-central vacuole
