BIOL 2051 - Luzan Exam 1 Questions and Answers Already Passed
Regarding early life on Earth,
A) microbial life existed for billions of years before plant and animal life.
B) microbial life existed long before animals but has been around for about the same amount of
time as plants.
C) microbial life, plant life, and animal life all appeared at about the same time.
D) it is impossible to determine which type of life first appeared. - Answers microbial life existed
for billions of years before plant and animal life.
The person who described the "wee animalcules" was
A) Robert Hooke.
B) Antoni van Leeuwenhoek.
C) Louis Pasteur.
D) Ferdinand Cohn. - Answers Antoni van Leeuwenhoek.
Microbial sterilization is used to
A) decrease the possibility of contaminants growing in a culture.
B) kill bacteria but not necessarily viruses or other microbes.
C) kill all microbes in or on objects.
D) clean a work area. - Answers kill all microbes in or on objects.
Which of the following is NOT an accomplishment of Louis Pasteur?
A) Determined that the alcohol-making process was mediated by microbial fermentation and
thus refuted the theory of spontaneous generation
B) Developed enrichment culture techniques
C) Developed heat sterilization techniques that involved the creation of a specialized swan-
necked flask
D) Developed the first rabies vaccine and treated thousands of individuals - Answers Developed
enrichment culture techniques
Transport proteins located in the cytoplasmic membrane are necessary when
, A) diffusion will not allow adequate amounts of a substance to enter the cell.
B) movement into the cell is against a concentration gradient.
C) the level of nutrients in nature is very low.
D) nutrient concentration is very low in the environment, transport is needed against the
concentration gradient, or diffusion is not possible. - Answers nutrient concentration is very low
in the environment, transport is needed against the concentration gradient, or diffusion is not
possible.
You are given an electron micrograph of a bacterial cell. In the micrograph, you can clearly see
three thin layers of different densities surrounding the cell. Based on the micrograph, you can
infer that this cell is ________ and would appear ________ after application of the Gram stain
procedure.
A) gram-positive / purple
B) gram-negative / pink
C) gram-positive / pink
D) gram-negative / purple - Answers gram-negative / pink
The Golgi complex functions to ______ (choose the best answer)
A) modify and secrete proteins to the external environment.
B) sort proteins used within the cell.
C) both modify and sort proteins into those destined for secretion and those that function in
membrane structures.
D) synthesize proteins. - Answers both modify and sort proteins into those destined for
secretion and those that function in membrane structures.
Some of the intestinal symptoms elicited by pathogens such as Salmonella enterica, Shigella
dysentery, and Escherichia coli are due to the presence of
A) pseudomurein.
B) S-layers.
C) lipopolysaccharides
D) peptidoglycan. - Answers lipopolysaccharides
When enzyme action stops due to a buildup of the end product, this control is called ________.
Regarding early life on Earth,
A) microbial life existed for billions of years before plant and animal life.
B) microbial life existed long before animals but has been around for about the same amount of
time as plants.
C) microbial life, plant life, and animal life all appeared at about the same time.
D) it is impossible to determine which type of life first appeared. - Answers microbial life existed
for billions of years before plant and animal life.
The person who described the "wee animalcules" was
A) Robert Hooke.
B) Antoni van Leeuwenhoek.
C) Louis Pasteur.
D) Ferdinand Cohn. - Answers Antoni van Leeuwenhoek.
Microbial sterilization is used to
A) decrease the possibility of contaminants growing in a culture.
B) kill bacteria but not necessarily viruses or other microbes.
C) kill all microbes in or on objects.
D) clean a work area. - Answers kill all microbes in or on objects.
Which of the following is NOT an accomplishment of Louis Pasteur?
A) Determined that the alcohol-making process was mediated by microbial fermentation and
thus refuted the theory of spontaneous generation
B) Developed enrichment culture techniques
C) Developed heat sterilization techniques that involved the creation of a specialized swan-
necked flask
D) Developed the first rabies vaccine and treated thousands of individuals - Answers Developed
enrichment culture techniques
Transport proteins located in the cytoplasmic membrane are necessary when
, A) diffusion will not allow adequate amounts of a substance to enter the cell.
B) movement into the cell is against a concentration gradient.
C) the level of nutrients in nature is very low.
D) nutrient concentration is very low in the environment, transport is needed against the
concentration gradient, or diffusion is not possible. - Answers nutrient concentration is very low
in the environment, transport is needed against the concentration gradient, or diffusion is not
possible.
You are given an electron micrograph of a bacterial cell. In the micrograph, you can clearly see
three thin layers of different densities surrounding the cell. Based on the micrograph, you can
infer that this cell is ________ and would appear ________ after application of the Gram stain
procedure.
A) gram-positive / purple
B) gram-negative / pink
C) gram-positive / pink
D) gram-negative / purple - Answers gram-negative / pink
The Golgi complex functions to ______ (choose the best answer)
A) modify and secrete proteins to the external environment.
B) sort proteins used within the cell.
C) both modify and sort proteins into those destined for secretion and those that function in
membrane structures.
D) synthesize proteins. - Answers both modify and sort proteins into those destined for
secretion and those that function in membrane structures.
Some of the intestinal symptoms elicited by pathogens such as Salmonella enterica, Shigella
dysentery, and Escherichia coli are due to the presence of
A) pseudomurein.
B) S-layers.
C) lipopolysaccharides
D) peptidoglycan. - Answers lipopolysaccharides
When enzyme action stops due to a buildup of the end product, this control is called ________.
