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BS 161 EXAM 2 2024 UPDATE [STUDY GUIDE] COMPREHENSIVE QUESTIONS AND CORRECT ANSWERS GRADE A+ GET IT 100% RIGHT $22.99
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BS 161 EXAM 2 2024 UPDATE [STUDY GUIDE] COMPREHENSIVE QUESTIONS AND CORRECT ANSWERS GRADE A+ GET IT 100% RIGHT

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BS 161 EXAM 2 2024 UPDATE [STUDY GUIDE] COMPREHENSIVE QUESTIONS AND CORRECT ANSWERS GRADE A+ GET IT 100% RIGHT

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  • May 29, 2024
  • 39
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

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  • BS 161
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BS 161 EXAM 2 [STUDY GUIDE] COMPREHENSIVE
QUESTIONS AND CORRECT ANSWERS GRADE A+
GET IT 100% RIGHT


Molecules that are _______ and _______ are able to move across the
cell membrane via simple diffusion. - (correct answer) hydrophobic
and small


At equilibrium, there will be no net movement of molecules across the
cell membrane. True or false? - (correct answer) True.


Simple diffusion of a molecule down its concentration gradient requires
an input of energy to the system. True or false? - (correct answer)
False.


Which of the answer choices correctly describes the movement of
water across a selectively permeable membrane during osmosis?
a. The water will move from high water concentration to low water
concentration.
b. The water will move from low solute concentration to high solute
concentration.
c. Either of these descriptions is correct and equivalent. - (correct
answer) c. Either of these descriptions is correct and equivalent.
As molecules move down their concentration gradient, from a more
ordered state, entropy is:

,a. remaining the same
b. decreasing
c. increasing - (correct answer) c. increasing


Diffusion is best described as the random movement of molecules
influences by:
a. the thermal energy of the environment and the width of the plasma
membrane.
b. the width of the plasma membrane of the cell.
c. the thermal energy of the environment.
d. energy transferred from the molecular collisions in the cell.
e. the thermal energy of the environment and energy transferred from
molecular collisions in the cell. - (correct answer) e. the thermal
energy of the environment and energy transferred from molecular
collisions in the cell.




A container is divided into two compartments by a membrane that is
fully permeable to water and small ions. Water is added to one side of
the membrane (side A), and a 5% solution of sodium chloride (NaCl) is
added to the other side (side B). If allowed to reach equilibrium, which
of the answer choices would you predict?
a. The NaCl concentration on side A and side B will each be 5%.
b. The NaCl concentration on side A and side B will each be 2.5%.
c. The level of solution on side B will be higher than side A.

,d. The level of solution on side A will be higher than side B. - (correct
answer) b. The NaCl concentration on side A and side B will each be
2.5%.


A container is divided into two compartments by a membrane that is
fully permeable to water but not to larger molecules. Water is added to
one side of the membrane (side A), and an equal volume of 5% solution
of glucose is added to the other (side B). What would you predict will
happen?
a. Glucose will diffuse from side B to side A.
b. Glucose will diffuse from side A to side B.
c. The water level on side A will increase and on side B will decrease.
d. The water level on side B will increase and on side A will decrease. -
(correct answer) d. The water level on side B will increase and on side
A will decrease.


The defining characteristics of active transport are that this category of
transport moves substances ______ their concentration gradient and
requires _____. - (correct answer) against; energy


Which of the answer choices would be the best analogy for an
electrochemical gradient across a cellular membrane?
a. an electric generator
b. a battery
c. a light bulb

, d. a waterfall
e. a water pump - (correct answer) b. a battery


Which one of the following is NOT a component of an animal cell's
plasma membrane?
a. protein
b. nucleic acid
c. lipid
d. carbohydrate - (correct answer) b. nucleic acid


Long, saturated fatty acid tails _____ lipid mobility and _____
membrane fluidity.
a. reduce; decrease
b. enhance; maintain
c. maintain; decrease
d. reduce; increase
e. enhance; increase - (correct answer) a. reduce; decrease


Phospholipids spontaneously form a variety of structures in aqueous
solution. Which choice best describes this property?
a. the ability of vesicles to bud off from the plasma membrane.
b. all of these choices are correct.
c. formation of lipid bilayers.

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