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Biology 240 Exam 2 Review Questions
Terms in this set (28)
According to the Fluid-Mosaic model, a membrane __________
D) is composed of a fluid bilayer of phospholipids with embedded amphipathic proteins.
D) Refer to picture
Cell membranes have distinct inside and outside faces. Which of the following statements is
the most likely explanation for the membrane's asymmetrical nature?
C) The two sides of a cell membrane face different environments and carry out different
Which of the following are least likely to diffuse through the phospholipid bilayer of a cell membrane?
B) small ions
The solutions in the two arms of this U-tube are separated by a membrane that is permeable
to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose
and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid
levels on both sides are equal.
Which of the following will be true when the system illustrated above reaches equilibrium?
B) The water level will be higher in side A than in side B.
Most cells cannot harness heat to perform work because ________.
B) temperature is usually uniform throughout a cell
A decrease in entropy is associated with which type of reaction?
Which of the following statements is an important consequence of the first law of thermodynamics for a living organism?
B) An organism ultimately must obtain all of the necessary energy for life from its environment.
The mathematical expression for the change in free energy of a system is ΔG = ΔH - TΔS. Which of the following statements is correct?
C) ΔG is the change in free energy.
Which of the following statements describes a central role that ATP plays in cellular metabolism?
B) ATP provides energy coupling between exergonic and endergonic reactions.
Figure of reaction w/ catalyst
What in the figure would be the same in either an enzyme-catalyzed or a non-catalyzed reaction?
Under what conditions do photosynthesis and cellular respiration occur in plants?
C) Photosynthesis occurs only in the light, and cellular respiration occurs in both the dark and
Use the following figure to answer the question. What wavelength of light in the figure is most effective in driving photosynthesis?
A) 420 nm
Why are the reaction centers of photosystems composed of several structurally different
B) This arrangement enables the plant to absorb light energy of a variety of wavelengths.
What are the products of cyclic electron flow during the light reactions of photosynthesis?
Compared to C3 plants, C4 plants ________.
A) can continue to fix CO2 even at lower CO2 concentrations and higher oxygen concentrations
Which of the following statements describes what happens to a molecule that functions as the
reducing agent (electron donor) in a redox or oxidation-reduction reaction?
A) It loses electrons and loses potential energy.
High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis.
Citric acid binds to the enzyme at a different location from the active site. This is an example
B) allosteric regulation
If a cell is able to synthesize a total of 30 ATP molecules for each molecule of glucose
completely oxidized to carbon dioxide and water, approximately how many ATP molecules
can the same cell synthesize starting with one molecule of pyruvate oxidized to carbon dioxide
HINT: How many ATP molecules are produced for each FADH2 that is being oxidized in the CA
Which of the following statements about the electron transport chain is true?
C) It consists of a series of redox reactions
During which of the following metabolic processes is most of the CO2 from the catabolism of
D) the citric acid cycle
Use the following figure to answer the question.
Which of the following types of signaling is represented in the figure?
Which of the following statements about a G protein signaling pathway is true?
B) A G protein bound to GTP is in its active state.
If an animal cell suddenly lost the ability to produce GTP, what might happen to its signaling
A) It would not be able to activate G proteins on the cytoplasmic side of the plasma membrane.
A signal transmitted via phosphorylation of a series of proteins is generally associated with
which of the following events?
A) conformational changes to each protein in the series
If a pharmaceutical company wished to design a drug to maintain low blood sugar levels, one
approach might be to design a compound that does which of the following?
D) increases phosphodiesterase activity in liver cells
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