EBIO 1210 TEST 1 QUESTIONS WITH 100% ACCURATE
SOLUTIONS
1) Diffusion and Facilitated Diffusion are examples of what? -- Answer ✔✔ Passive
transport
2) Facilitated diffusion of water through membranes via aquaporin proteins -- Answer
✔✔ Osmosis
3) What provides the energy for facilitated downhill diffusion of the hydrophilic sugar
fructose?
A) the potential energy contained in the concentration gradient of the fructose
B) the transport protein
C) the potential chemical energy contained in C-H bonds of the sugar --
Answer ✔✔ A) No energy is required because it is going "downhill"
4) What are two examples of Active Transport? -- Answer ✔✔ 1. Sodium-Potassium
Pump
2. CA2+ pump of muscles cells
5) What energizes these pumps? -- Answer ✔✔ ATP via phosphorylation
6) Phosphorylation of the sodium/potassium pump (Na+/K+ pump) energizes uphill
transport of what?
A) 1 Na+ and 1 K+ are pumped uphill
B) only Na+ is pumped uphill
C) only K+ is pumped uphill
D) 3 Na+ and 2 K+ are pumped uphill
E) 3 Na+ and 3 K+ are pumped uphill -- Answer ✔✔ D)
,7) What are the 3 types of work that require energy provided by ATP? -- Answer ✔✔
1. Mechanical- motor molecules (muscles, vesicles)
2. Transport- Pumps in brain, heart, and muscles
3. Chemical- Synthesizing life's large molecules
8) What energizes ATP?
A) The phosphate groups add many bonds with tightly held electrons.
B) Each phosphate group adds more negative charges that attract each other.
C) Each phosphate group adds more negative charges that repel each other. --
Answer ✔✔ C)
- Can't be A because bonds with tight electrons are very stable... not
reactive or energy rich
- When charges are the same, they repel each other (like a magnet)....
pops off a phosphate group and gives it to a different molecule
9) Predict the properties of an excellent donor of an energized P group: The donor
must
A) hang on tightly to the P group.
B) be "eager" to get rid of the P group.
C) be a molecule to which a P group can be added without the input of energy.
D) A and C
E) B and C -- Answer ✔✔ B) If it's going to be a good donor, it must be eager
to get rid of a phosphate group.... willing to USE ENERGY to get rid of it
****Loading from low to high potential energy requires energy input
10) Which of the following statement(s) regarding ATP is/are correct?
A) ATP serves as a main energy carrier inside cells.
B) In the cell, ATP drives reactions that require energy by the transfer of a
phosphate group to specific reactants.
C) The regeneration of ATP from ADP and phosphate is a reaction that
requires energy.
D) A and B only
E) A, B, and C -- Answer ✔✔ E) All of them
, 11) (= ultrafast electric signal) travels along axon as the basis for nerve function --
Answer ✔✔ Action potential
12) A stimulus opens Na+ channels. Predict what happens:
A) Na+ rushes out of the cell and the original electrical gradient increases (cell
becomes more positive on the outside).
B) Na+ rushes into the cell and the original electrical gradient is reversed (cell
becomes more positive on the inside). -- Answer ✔✔ B) Goes DOWN its
concentration gradient
13) The positive charge on the inside causes K+ channels to open "behind" the action
potential. Predict what will happen:
A) K+ rushes out of the cell and the original electrical gradient starts to
reestablish.
B) K+ rushes into the cell and the electrical gradient remains reversed. --
Answer ✔✔ A) DOWN its concentration gradient
14) This pump is ESSENTIAL for nerve impulses... Proper functioning of which pump is
thus critical for mental health and learning ? -- Answer ✔✔ The sodium-potassium
pump
15) True or False..... Pump function requires presence of specific polyunsaturated fatty
acids as components of membrane phospholipids -- Answer ✔✔ True
16) What initiates muscle contraction?
A) Ca2+ is rapidly released via passive transport
B) Ca2+ moves from cytosol to the SR
C) Ca2+ moves from SR to the cytosol
D) A and B
E) A and C -- Answer ✔✔ E) The sarcoplasmic reticulum (SR) holds a high
volume of calcium which is suddenly released... it's basically a storage..... The
calcium then moves to the cytosol
17) What happens during muscle relaxation?
A) Ca2+ moves back into the SR by passive transport.
B) Ca2+ moves back into the SR by active transport.
SOLUTIONS
1) Diffusion and Facilitated Diffusion are examples of what? -- Answer ✔✔ Passive
transport
2) Facilitated diffusion of water through membranes via aquaporin proteins -- Answer
✔✔ Osmosis
3) What provides the energy for facilitated downhill diffusion of the hydrophilic sugar
fructose?
A) the potential energy contained in the concentration gradient of the fructose
B) the transport protein
C) the potential chemical energy contained in C-H bonds of the sugar --
Answer ✔✔ A) No energy is required because it is going "downhill"
4) What are two examples of Active Transport? -- Answer ✔✔ 1. Sodium-Potassium
Pump
2. CA2+ pump of muscles cells
5) What energizes these pumps? -- Answer ✔✔ ATP via phosphorylation
6) Phosphorylation of the sodium/potassium pump (Na+/K+ pump) energizes uphill
transport of what?
A) 1 Na+ and 1 K+ are pumped uphill
B) only Na+ is pumped uphill
C) only K+ is pumped uphill
D) 3 Na+ and 2 K+ are pumped uphill
E) 3 Na+ and 3 K+ are pumped uphill -- Answer ✔✔ D)
,7) What are the 3 types of work that require energy provided by ATP? -- Answer ✔✔
1. Mechanical- motor molecules (muscles, vesicles)
2. Transport- Pumps in brain, heart, and muscles
3. Chemical- Synthesizing life's large molecules
8) What energizes ATP?
A) The phosphate groups add many bonds with tightly held electrons.
B) Each phosphate group adds more negative charges that attract each other.
C) Each phosphate group adds more negative charges that repel each other. --
Answer ✔✔ C)
- Can't be A because bonds with tight electrons are very stable... not
reactive or energy rich
- When charges are the same, they repel each other (like a magnet)....
pops off a phosphate group and gives it to a different molecule
9) Predict the properties of an excellent donor of an energized P group: The donor
must
A) hang on tightly to the P group.
B) be "eager" to get rid of the P group.
C) be a molecule to which a P group can be added without the input of energy.
D) A and C
E) B and C -- Answer ✔✔ B) If it's going to be a good donor, it must be eager
to get rid of a phosphate group.... willing to USE ENERGY to get rid of it
****Loading from low to high potential energy requires energy input
10) Which of the following statement(s) regarding ATP is/are correct?
A) ATP serves as a main energy carrier inside cells.
B) In the cell, ATP drives reactions that require energy by the transfer of a
phosphate group to specific reactants.
C) The regeneration of ATP from ADP and phosphate is a reaction that
requires energy.
D) A and B only
E) A, B, and C -- Answer ✔✔ E) All of them
, 11) (= ultrafast electric signal) travels along axon as the basis for nerve function --
Answer ✔✔ Action potential
12) A stimulus opens Na+ channels. Predict what happens:
A) Na+ rushes out of the cell and the original electrical gradient increases (cell
becomes more positive on the outside).
B) Na+ rushes into the cell and the original electrical gradient is reversed (cell
becomes more positive on the inside). -- Answer ✔✔ B) Goes DOWN its
concentration gradient
13) The positive charge on the inside causes K+ channels to open "behind" the action
potential. Predict what will happen:
A) K+ rushes out of the cell and the original electrical gradient starts to
reestablish.
B) K+ rushes into the cell and the electrical gradient remains reversed. --
Answer ✔✔ A) DOWN its concentration gradient
14) This pump is ESSENTIAL for nerve impulses... Proper functioning of which pump is
thus critical for mental health and learning ? -- Answer ✔✔ The sodium-potassium
pump
15) True or False..... Pump function requires presence of specific polyunsaturated fatty
acids as components of membrane phospholipids -- Answer ✔✔ True
16) What initiates muscle contraction?
A) Ca2+ is rapidly released via passive transport
B) Ca2+ moves from cytosol to the SR
C) Ca2+ moves from SR to the cytosol
D) A and B
E) A and C -- Answer ✔✔ E) The sarcoplasmic reticulum (SR) holds a high
volume of calcium which is suddenly released... it's basically a storage..... The
calcium then moves to the cytosol
17) What happens during muscle relaxation?
A) Ca2+ moves back into the SR by passive transport.
B) Ca2+ moves back into the SR by active transport.
