BIO 1201 EXAM 2 GREGG UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS VERIFIED 2027 EDITION
1. transport proteins
are responsible for controlling passage across the membrane
2. fluid mosaic model
The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids
3. fatty acid tails
nonpolar, hydrophobic
4. fatty acid heads
hydrophilic, polar
5. periphial proteins
bound to the surface of the membrane
6. integral proteins
penetrate the hydrophobic core (ones that span the membrane are transmembrane protiens
7. How do cells recognize each other?
by binding to molecules, often containing carbohydrates, on the extracellular surface of the plasma
membrane
8. Glycolipids
Membrane carbohydrates that are covalently bonded to lipids.
9. Hypdrophobic
molecules such as hydrocarbons that can dissolve in the lipid bilayer and pass through the membrane
rapidly
10. Hydrophilic
molecules that don't cross the membrane easily (ions and polar molecules)
11. transport proteins
allow passage of hydrophilic substances across the membrane
12. carrier proteins
bind to molecules and change shape to shuttle them across the membrane
13. passive transport
the diffusion of a substance across a membrane with no energy investment
14. Diffusuion
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
substances diffuse from high concentration----> low concentration
1
, 16. Osmosis
Diffusion of water through a selectively permeable membrane
17. Isotonic
when the concentration of two solutions is the same (no net movement)
18. Hypertonic
cell losses water and shrivils
19. hypertonic
cell gains water and expands
20. In a plant cell water moves in and out affecting the size of what?
central vacuole
21. facilitated diffusion
the transport of substances through a cell membrane along a concentration gradient with the aid of
carrier proteins
22. ion channels
channel proteins that transport ions
23. gated channels
open or close in response to a stimulus
24. active transport
requires energy (ATP) to move substances against their concentration gradient
25. cotransport
coupled transport by a membrane protein
26. transport proteins
small molecules leave through the lipid bilayer via___________?
27. Phagocytosis
Cell eating
28. Pinocytosis
Cell drinking
29. hydrophilic tails
If a plasma membrane were compared to a sandwich, __________ would be considered the filling
30. Metabolism
All of the chemical reactions that occur within an organism
31. active transport
cytoplasm of cell has a higher concentration of k+ ions. How will K+ ions enter the cell?
32. metabolic pathway
Begins with a specific molecule, which is then altered in a series of defined steps, resulting in a certain
product.
2
ANSWERS VERIFIED 2027 EDITION
1. transport proteins
are responsible for controlling passage across the membrane
2. fluid mosaic model
The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids
3. fatty acid tails
nonpolar, hydrophobic
4. fatty acid heads
hydrophilic, polar
5. periphial proteins
bound to the surface of the membrane
6. integral proteins
penetrate the hydrophobic core (ones that span the membrane are transmembrane protiens
7. How do cells recognize each other?
by binding to molecules, often containing carbohydrates, on the extracellular surface of the plasma
membrane
8. Glycolipids
Membrane carbohydrates that are covalently bonded to lipids.
9. Hypdrophobic
molecules such as hydrocarbons that can dissolve in the lipid bilayer and pass through the membrane
rapidly
10. Hydrophilic
molecules that don't cross the membrane easily (ions and polar molecules)
11. transport proteins
allow passage of hydrophilic substances across the membrane
12. carrier proteins
bind to molecules and change shape to shuttle them across the membrane
13. passive transport
the diffusion of a substance across a membrane with no energy investment
14. Diffusuion
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
substances diffuse from high concentration----> low concentration
1
, 16. Osmosis
Diffusion of water through a selectively permeable membrane
17. Isotonic
when the concentration of two solutions is the same (no net movement)
18. Hypertonic
cell losses water and shrivils
19. hypertonic
cell gains water and expands
20. In a plant cell water moves in and out affecting the size of what?
central vacuole
21. facilitated diffusion
the transport of substances through a cell membrane along a concentration gradient with the aid of
carrier proteins
22. ion channels
channel proteins that transport ions
23. gated channels
open or close in response to a stimulus
24. active transport
requires energy (ATP) to move substances against their concentration gradient
25. cotransport
coupled transport by a membrane protein
26. transport proteins
small molecules leave through the lipid bilayer via___________?
27. Phagocytosis
Cell eating
28. Pinocytosis
Cell drinking
29. hydrophilic tails
If a plasma membrane were compared to a sandwich, __________ would be considered the filling
30. Metabolism
All of the chemical reactions that occur within an organism
31. active transport
cytoplasm of cell has a higher concentration of k+ ions. How will K+ ions enter the cell?
32. metabolic pathway
Begins with a specific molecule, which is then altered in a series of defined steps, resulting in a certain
product.
2
