MCB 3020 EXAM 1 QUESTIONS AND ANSWERS
Cell walls of most Archaea and bacteria contain peptidoglycan. - Answers - False
(only bacteria)
Unlike members of the Bacteria, most archaeans have linear chromosomes. - Answers -
False
(mostly circular, but some are linear)
In order to stain flagella so that they may be readily observed by light microscopy, it is
usually necessary to increase their thickness. - Answers - True
The synthesis of glucose from non-carbohydrate precursors is called - Answers -
gluconeogenesis
The disinfectant of choice for municipal water supplies is - Answers - Chlorine
The ribosomal RNA studies that led to the division of prokaryotic organisms into the
Bacteria and the Archaea were begun by - Answers - Woese
Which line illustrates an enzyme-catalyzed reaction? - Answers - The one with less
activation energy required (less of a "hill")
Cells may enter stationary phase because of - Answers - the depletion of an essential
nutrient.
a lack of available oxygen.
the accumulation of toxic waste products.
(all were correct)
Bacterial peptidoglycan is not a good target for antibiotics because it is present in
human cells as well, leading to host damage. - Answers - False
(is a good target since it is only present in bacteria)
Chloroplasts are the site for both the light and dark reactions of photosynthesis. -
Answers - True
A filamentous organelle comprised of tubulins with a diameter of 25 nm is called -
Answers - Microtubule
Which of the following has the phases of the Calvin-Benson cycle in the correct order,
starting with the entry of ribulose 1,5-bisphosphate? - Answers - Carboxylation phase,
reduction phase, regeneration phase
, Where is the electron transport chain located in bacterial cells? - Answers - Plasma
Membrane
Old cultures of bacteria that have lost their ability to cause disease are said to be -
Answers - attenuated
There are __________ common amino acids used to synthesize proteins. - Answers -
20
Proteins function in modern cells as - Answers - both catalysts and structural elements.
Antiseptic surgery was pioneered by - Answers - Lister
Organisms that do not require oxygen for growth but grow better in its presence are
called - Answers - facultative anaerobes
Aminoglycoside antibiotics - Answers - bind to the 30S ribosomal subunit
The cyclic nitrogenous base used in transcription, uracil, is a _____. - Answers -
pyrimidine
The Archaea generally lack which of the following that are normally found in gram-
negative bacteria? - Answers - A complex peptidoglycan network
Lipopolysaccharide
Outer membrane
(all were correct)
Which of the following is useful in distinguishing between prokaryotic and eukaryotic
cells? - Answers - The presence of membrane-delimited organelles within the cytoplasm
Which of the following strategies enable non-acidophilic bacteria to endure lower pH
environments? - Answers - Synthesis of acid shock proteins that protect other cellular
proteins
Presence of internal buffers
Proton pumps that pump H+ out of the cell
(All of the choices are correct.)
The membrane bound structure that contains the chromosomes of eukaryotes is called
the nucleus. - Answers - True
The major difference between the vacuoles of eukaryotes and the inclusion bodies of
prokaryotes is that the former are membrane-bound, whereas the latter are not. -
Answers - True
Cell walls of most Archaea and bacteria contain peptidoglycan. - Answers - False
(only bacteria)
Unlike members of the Bacteria, most archaeans have linear chromosomes. - Answers -
False
(mostly circular, but some are linear)
In order to stain flagella so that they may be readily observed by light microscopy, it is
usually necessary to increase their thickness. - Answers - True
The synthesis of glucose from non-carbohydrate precursors is called - Answers -
gluconeogenesis
The disinfectant of choice for municipal water supplies is - Answers - Chlorine
The ribosomal RNA studies that led to the division of prokaryotic organisms into the
Bacteria and the Archaea were begun by - Answers - Woese
Which line illustrates an enzyme-catalyzed reaction? - Answers - The one with less
activation energy required (less of a "hill")
Cells may enter stationary phase because of - Answers - the depletion of an essential
nutrient.
a lack of available oxygen.
the accumulation of toxic waste products.
(all were correct)
Bacterial peptidoglycan is not a good target for antibiotics because it is present in
human cells as well, leading to host damage. - Answers - False
(is a good target since it is only present in bacteria)
Chloroplasts are the site for both the light and dark reactions of photosynthesis. -
Answers - True
A filamentous organelle comprised of tubulins with a diameter of 25 nm is called -
Answers - Microtubule
Which of the following has the phases of the Calvin-Benson cycle in the correct order,
starting with the entry of ribulose 1,5-bisphosphate? - Answers - Carboxylation phase,
reduction phase, regeneration phase
, Where is the electron transport chain located in bacterial cells? - Answers - Plasma
Membrane
Old cultures of bacteria that have lost their ability to cause disease are said to be -
Answers - attenuated
There are __________ common amino acids used to synthesize proteins. - Answers -
20
Proteins function in modern cells as - Answers - both catalysts and structural elements.
Antiseptic surgery was pioneered by - Answers - Lister
Organisms that do not require oxygen for growth but grow better in its presence are
called - Answers - facultative anaerobes
Aminoglycoside antibiotics - Answers - bind to the 30S ribosomal subunit
The cyclic nitrogenous base used in transcription, uracil, is a _____. - Answers -
pyrimidine
The Archaea generally lack which of the following that are normally found in gram-
negative bacteria? - Answers - A complex peptidoglycan network
Lipopolysaccharide
Outer membrane
(all were correct)
Which of the following is useful in distinguishing between prokaryotic and eukaryotic
cells? - Answers - The presence of membrane-delimited organelles within the cytoplasm
Which of the following strategies enable non-acidophilic bacteria to endure lower pH
environments? - Answers - Synthesis of acid shock proteins that protect other cellular
proteins
Presence of internal buffers
Proton pumps that pump H+ out of the cell
(All of the choices are correct.)
The membrane bound structure that contains the chromosomes of eukaryotes is called
the nucleus. - Answers - True
The major difference between the vacuoles of eukaryotes and the inclusion bodies of
prokaryotes is that the former are membrane-bound, whereas the latter are not. -
Answers - True
