Biology 1201 Exam 2 Questions &
Answers 100% Solved!!
Of the following functions, which is most important for the glycoproteins and glycolipids
of animal cell membranes?
A)facilitated diffusion of molecules down their concentration gradients
B)active transport of molecules against their concentration gradients
C)maintaining the integrity of fluid mosaic membrane
D)maintaining membrane at low temperatures
E)a cell's ability to distinguish one type of neighboring cell from another - ANSWERSE)a
cell's ability to distinguish one type of neighboring cell from another
What kinds of molecules pass through a cell membrane most easily? - ANSWERSsmall
and hydrophobic molecules
Which of the following statements is correct about diffusion?
A)it is very rapid over long distances
B)it requires an expenditure of energy by the cell
C)it is a passive process in which molecules move from a region of higher concentration
to a region of lower concentration
D)it is an active process in which molecules move from a region of lower concentration
to one of higher concentration
E)it requires integral proteins in the cell membrane - ANSWERSC)it is a passive
process in which molecules move from a region of higher concentration to a region of
lower concentration
A patient has a had a serious accident and lost a lot of blood. In an attempt to replenish
body fluids, distilled water, equal to the volume of blood lost, is transferred directly into
one of his veins. What will be the most probable result of this transfusion? -
ANSWERSThe patient's red blood cells will swell because the blood fluid is hypotonic
compared to the cells
What is required for the movement of potassium into an animal cell? - ANSWERSan
energy source such as ATP
An organism with a cell wall would have the most difficulty doing what process? -
ANSWERSphagocytosis
Which of the following is likely to lead to an increase in the concentration of ATP in a
cell?
A)an increase in a cell's anabolic activity
B)an increase in a cell's catabolic activity
, C)an increased influx of cofactor molecules
D)an increased amino acid concentration
E)the cell's increased transport of materials to the environment - ANSWERSA)an
increase in cell's anabolic activity
Which of the following is an example of potential rather than kinetic energy?
A) H+ flowing through ATP Synthase
B) Electrons moving through an electron transport chain
C) A firefly using light flashes to attract a mate
D) Electrons in a protein
E) Electrons in CO2 - ANSWERSD)electrons in a protein
The mechanism in which the end product of a metabolic pathway inhibits an earlier step
in the pathway is known as what? - ANSWERSFeedback inhibition
What happens to the molecule that functions as the reducing agent (electron donor) in a
redox or oxidation-reduction reaction? - ANSWERSIt loses electrons and loses energy
Which of the following statements describes NAH+?
A) NAD+ is reduced to NADH during both glycolysis and the citric acid cycle.
B) NAD+ has more chemical energy than NADH.
C) NAD+ is reduced by the action of hydrogenases.
D) NAD+ can donate electrons for use in oxidative phosphorylation.
E) In the absence of NAD+, glycolysis can still function. - ANSWERSA)NAD+ is reduced
to NADH during both glycolysis and citric acid cycle
The ATP made during the Krebs Cycle is generated by what? - ANSWERSsubstrate-
level phosphorylation
When glucose monomers are joined together by glycosidic linkages to forma cellulose
polymer, the changes in free energy, total energy, and entropy are as follows: -
ANSWERS+△G, +△H, -△S
What would happen if enzymes did not mediate catabolic, exergonic reactions of large
molecules in organisms? - ANSWERSAll their energy would be lost as heat
During a laboratory experiment, you discover that an enzyme-catalyzed reation has a
△G of -20kcal/mol. If you double the amount of enzyme in the reaction, what will be the
△G for the new reaction? - ANSWERS-20 kcal/mol
Which of the following metabolic processes can occur without a net influx of energy
from some other processes?
A) ADP + Pi ---> ATP + H2O
B) C6H12O6 + 6 O2---> 6 CO2 + 6 H2O
C) 6 CO2 + 6 H2O---> C6H12O6 + 6 O2
D) amino acids---> protein
E) glucose + fructose--->sucrose - ANSWERSB)C6H12O6+6O2--->6CO2+6H2O
Answers 100% Solved!!
Of the following functions, which is most important for the glycoproteins and glycolipids
of animal cell membranes?
A)facilitated diffusion of molecules down their concentration gradients
B)active transport of molecules against their concentration gradients
C)maintaining the integrity of fluid mosaic membrane
D)maintaining membrane at low temperatures
E)a cell's ability to distinguish one type of neighboring cell from another - ANSWERSE)a
cell's ability to distinguish one type of neighboring cell from another
What kinds of molecules pass through a cell membrane most easily? - ANSWERSsmall
and hydrophobic molecules
Which of the following statements is correct about diffusion?
A)it is very rapid over long distances
B)it requires an expenditure of energy by the cell
C)it is a passive process in which molecules move from a region of higher concentration
to a region of lower concentration
D)it is an active process in which molecules move from a region of lower concentration
to one of higher concentration
E)it requires integral proteins in the cell membrane - ANSWERSC)it is a passive
process in which molecules move from a region of higher concentration to a region of
lower concentration
A patient has a had a serious accident and lost a lot of blood. In an attempt to replenish
body fluids, distilled water, equal to the volume of blood lost, is transferred directly into
one of his veins. What will be the most probable result of this transfusion? -
ANSWERSThe patient's red blood cells will swell because the blood fluid is hypotonic
compared to the cells
What is required for the movement of potassium into an animal cell? - ANSWERSan
energy source such as ATP
An organism with a cell wall would have the most difficulty doing what process? -
ANSWERSphagocytosis
Which of the following is likely to lead to an increase in the concentration of ATP in a
cell?
A)an increase in a cell's anabolic activity
B)an increase in a cell's catabolic activity
, C)an increased influx of cofactor molecules
D)an increased amino acid concentration
E)the cell's increased transport of materials to the environment - ANSWERSA)an
increase in cell's anabolic activity
Which of the following is an example of potential rather than kinetic energy?
A) H+ flowing through ATP Synthase
B) Electrons moving through an electron transport chain
C) A firefly using light flashes to attract a mate
D) Electrons in a protein
E) Electrons in CO2 - ANSWERSD)electrons in a protein
The mechanism in which the end product of a metabolic pathway inhibits an earlier step
in the pathway is known as what? - ANSWERSFeedback inhibition
What happens to the molecule that functions as the reducing agent (electron donor) in a
redox or oxidation-reduction reaction? - ANSWERSIt loses electrons and loses energy
Which of the following statements describes NAH+?
A) NAD+ is reduced to NADH during both glycolysis and the citric acid cycle.
B) NAD+ has more chemical energy than NADH.
C) NAD+ is reduced by the action of hydrogenases.
D) NAD+ can donate electrons for use in oxidative phosphorylation.
E) In the absence of NAD+, glycolysis can still function. - ANSWERSA)NAD+ is reduced
to NADH during both glycolysis and citric acid cycle
The ATP made during the Krebs Cycle is generated by what? - ANSWERSsubstrate-
level phosphorylation
When glucose monomers are joined together by glycosidic linkages to forma cellulose
polymer, the changes in free energy, total energy, and entropy are as follows: -
ANSWERS+△G, +△H, -△S
What would happen if enzymes did not mediate catabolic, exergonic reactions of large
molecules in organisms? - ANSWERSAll their energy would be lost as heat
During a laboratory experiment, you discover that an enzyme-catalyzed reation has a
△G of -20kcal/mol. If you double the amount of enzyme in the reaction, what will be the
△G for the new reaction? - ANSWERS-20 kcal/mol
Which of the following metabolic processes can occur without a net influx of energy
from some other processes?
A) ADP + Pi ---> ATP + H2O
B) C6H12O6 + 6 O2---> 6 CO2 + 6 H2O
C) 6 CO2 + 6 H2O---> C6H12O6 + 6 O2
D) amino acids---> protein
E) glucose + fructose--->sucrose - ANSWERSB)C6H12O6+6O2--->6CO2+6H2O
