Biol 2051 Exam 3 Nguyen Questions
with Complete Answers 2025-2026
Updated.
When counting colonies on an agar plate, it is generally assumed that each colony resulted from
one, original cell.
True or false? - Answer True
Which of the following antibiotics specifically inhibits DNA synthesis?
tetracycline
quinolones
gentamycin
polymyxin B - Answer quinolones
In higher eukaryotes, most aerobically generated ATP is produced by
A. a membrane-bound proton translocating ATP synthase during oxidative phosphorylation.
B. the TCA cycle
C. all of these generate equal amounts of ATP
D. Glycolysis - Answer A. a membrane-bound proton translocating ATP synthase during
oxidative phosphorylation.
Pathways with enzymes that function both catabolically and anabolically are often called
amphibolic pathways. These pathways have an advantage in that they
A. save energy and materials by using many of the same enzymes for both types of reactions.
B. save energy by employing electron transport chains to enhance their effectiveness.
,C. import enzymes from outside the cell to enhance their productivity and effectiveness. -
Answer A. save energy and materials by using many of the same enzymes for both types of
reactions.
Photosynthesis is divided into two parts; in the first part, __________ energy is trapped and
converted to chemical energy and reducing power. - Answer light
Which of the following may be used as sources of energy by chemolithotrophs?
A. reduced sulfur compounds
B. Hydrogen gas
C. reduced nitrogen compounds
D. all of these - Answer D. all of these
The pentose phosphate pathway produces two important precursor metabolites: erythrose 4-
phosphate, used to synthesize aromatic amino acids and vitamin B6 (pyridoxal), and
____________, a major component of nucleic acids. - Answer ribose 5-phosphate
An organism may use glycolysis and the pentose phosphate pathway simultaneously.
True or false? - Answer true
Which of the following lacks sufficient penetrating power for bulk sterilization?
A. UV radiation at 260nm
B. alpha and beta particles
C. x-rays
D. gamma radiation - Answer A. UV radiation at 260nm
, In industry, microorganisms are often cultured in an environment where ideal conditions are
maintained through continual nutrient provision and waste renewal. Such a system is called a
_______. - Answer continuous culture
A series of enzymatic steps that fixes carbon dioxide into carbohydrate is called the ______. -
Answer Calvin-Benson cycle
Oxygen acts as - Answer the terminal electron acceptor
When protons are pumped outside the cell membrane, - Answer a proton motive force is
created
The energy captured in the phosphorylation of ADP to ATP comes from the proton motive force
created when energy is released following the oxidation of electron carriers.
True or False? - Answer True
The pentose phosphate pathway is the major glycolytic pathway used by archaea.
True or false? - Answer False
Which of the following is a function of pasteurization?
A. reducing the total microbial population
B> increasing the shelf life of the product
C. Killing pathogenic microorganisms
D. all of these are correct - Answer D. all of these are correct
Oxygen is always required for the regeneration of NAD from NADH.
True or false? - Answer False
When a young, vigorously growing culture of bacteria is transferred to fresh medium of the
same composition, the lag phase is usually short or absent.
with Complete Answers 2025-2026
Updated.
When counting colonies on an agar plate, it is generally assumed that each colony resulted from
one, original cell.
True or false? - Answer True
Which of the following antibiotics specifically inhibits DNA synthesis?
tetracycline
quinolones
gentamycin
polymyxin B - Answer quinolones
In higher eukaryotes, most aerobically generated ATP is produced by
A. a membrane-bound proton translocating ATP synthase during oxidative phosphorylation.
B. the TCA cycle
C. all of these generate equal amounts of ATP
D. Glycolysis - Answer A. a membrane-bound proton translocating ATP synthase during
oxidative phosphorylation.
Pathways with enzymes that function both catabolically and anabolically are often called
amphibolic pathways. These pathways have an advantage in that they
A. save energy and materials by using many of the same enzymes for both types of reactions.
B. save energy by employing electron transport chains to enhance their effectiveness.
,C. import enzymes from outside the cell to enhance their productivity and effectiveness. -
Answer A. save energy and materials by using many of the same enzymes for both types of
reactions.
Photosynthesis is divided into two parts; in the first part, __________ energy is trapped and
converted to chemical energy and reducing power. - Answer light
Which of the following may be used as sources of energy by chemolithotrophs?
A. reduced sulfur compounds
B. Hydrogen gas
C. reduced nitrogen compounds
D. all of these - Answer D. all of these
The pentose phosphate pathway produces two important precursor metabolites: erythrose 4-
phosphate, used to synthesize aromatic amino acids and vitamin B6 (pyridoxal), and
____________, a major component of nucleic acids. - Answer ribose 5-phosphate
An organism may use glycolysis and the pentose phosphate pathway simultaneously.
True or false? - Answer true
Which of the following lacks sufficient penetrating power for bulk sterilization?
A. UV radiation at 260nm
B. alpha and beta particles
C. x-rays
D. gamma radiation - Answer A. UV radiation at 260nm
, In industry, microorganisms are often cultured in an environment where ideal conditions are
maintained through continual nutrient provision and waste renewal. Such a system is called a
_______. - Answer continuous culture
A series of enzymatic steps that fixes carbon dioxide into carbohydrate is called the ______. -
Answer Calvin-Benson cycle
Oxygen acts as - Answer the terminal electron acceptor
When protons are pumped outside the cell membrane, - Answer a proton motive force is
created
The energy captured in the phosphorylation of ADP to ATP comes from the proton motive force
created when energy is released following the oxidation of electron carriers.
True or False? - Answer True
The pentose phosphate pathway is the major glycolytic pathway used by archaea.
True or false? - Answer False
Which of the following is a function of pasteurization?
A. reducing the total microbial population
B> increasing the shelf life of the product
C. Killing pathogenic microorganisms
D. all of these are correct - Answer D. all of these are correct
Oxygen is always required for the regeneration of NAD from NADH.
True or false? - Answer False
When a young, vigorously growing culture of bacteria is transferred to fresh medium of the
same composition, the lag phase is usually short or absent.
