Straighterline Microbiology BIO250 Final
Proctored Exam Review – DONE APRIL
2025 (QUESTIONS 1 – 60)
In the nitrogen cycle, which of the following steps involves removal of nitrogen from the
atmosphere by bacteria? -CORRECTANSWER Nitrogen Fixation
If enough H+ ions are added to pure water to raise the H+ concentration of the solution
to ten times higher than the original concentration, what is the resulting OH-
concentration of the solution? -CORRECTANSWER 10-8 M
Fungi are able to reproduce asexually by creating conidiospores and sporangiospores.
Which of the following is an accurate explanation for why it is advantageous that they
are also capable of sexual reproduction? -CORRECTANSWER Offspring from two
parents may have variations in form and function that contribute to survival of the
species.
In a laboratory bacterial cell culture that has been infected by a virus, plaques are areas
in which... -CORRECTANSWER the virus has spread and left behind the remains of
dead cells.
The sun's energy is delivered as discrete packets that travel as waves and are called -
CORRECTANSWER Photons
,What is a characteristic of aerobic respiration? -CORRECTANSWER The process
includes glycolysis, the Krebs cycle, and the electron transport chain.
In completing protein synthesis in a prokaryote, what basic message is carried by a
specialized codon that has no corresponding tRNA? -CORRECTANSWER "Terminate
here."
Microbial drug resistance can be caused by mutations or by introduction of new genes
into a population. Which of the following can only be caused by the introduction of new
genes into a population? -CORRECTANSWER new enzymes that inactivate the drug
are synthesized
Why do the hands, feet, and breasts have more lymphatic vessels for host defense than
other areas of the human body? -CORRECTANSWER They have a high risk for
infection due to frequent contact.
Penicillin functions as an antimicrobial agent by inhibiting bacterial... -
CORRECTANSWER cell wall synthesis.
Which class of eukaryotic microorganisms can be subdivided into groups such as
Mastigophora, Sarcodina, Ciliophora, and Apicomplexa? -CORRECTANSWER
Protozoa
, Genetic material can be excised from one chromosome and directly integrated into
another via... -CORRECTANSWER transposons
What immune cell secretes numerous cytokines that help to coordinate the response of
other immune cells? -CORRECTANSWER TH cell
What enzymes are used to amplify DNA during PCR? -CORRECTANSWER DNA
polymerase
Which of the following is a scientific name? -CORRECTANSWER Streptococcus
pyogenes
Eosin-methylene blue agar, or EMB, is a commonly used bacteriological medium for
growing gram-negative bacteria from complex environments. It contains two dyes, eosin
and methylene blue, as well as the sugar lactose. Eosin is a pH indicator that changes
color when the medium is acidic, while methylene blue inhibits the growth of most gram-
positive bacteria. If an organism consumes lactose, acid will be produced, causing the
bacterial colonies to change color.
Based upon this description, this medium is ______ -CORRECTANSWER differential
and selective
Proctored Exam Review – DONE APRIL
2025 (QUESTIONS 1 – 60)
In the nitrogen cycle, which of the following steps involves removal of nitrogen from the
atmosphere by bacteria? -CORRECTANSWER Nitrogen Fixation
If enough H+ ions are added to pure water to raise the H+ concentration of the solution
to ten times higher than the original concentration, what is the resulting OH-
concentration of the solution? -CORRECTANSWER 10-8 M
Fungi are able to reproduce asexually by creating conidiospores and sporangiospores.
Which of the following is an accurate explanation for why it is advantageous that they
are also capable of sexual reproduction? -CORRECTANSWER Offspring from two
parents may have variations in form and function that contribute to survival of the
species.
In a laboratory bacterial cell culture that has been infected by a virus, plaques are areas
in which... -CORRECTANSWER the virus has spread and left behind the remains of
dead cells.
The sun's energy is delivered as discrete packets that travel as waves and are called -
CORRECTANSWER Photons
,What is a characteristic of aerobic respiration? -CORRECTANSWER The process
includes glycolysis, the Krebs cycle, and the electron transport chain.
In completing protein synthesis in a prokaryote, what basic message is carried by a
specialized codon that has no corresponding tRNA? -CORRECTANSWER "Terminate
here."
Microbial drug resistance can be caused by mutations or by introduction of new genes
into a population. Which of the following can only be caused by the introduction of new
genes into a population? -CORRECTANSWER new enzymes that inactivate the drug
are synthesized
Why do the hands, feet, and breasts have more lymphatic vessels for host defense than
other areas of the human body? -CORRECTANSWER They have a high risk for
infection due to frequent contact.
Penicillin functions as an antimicrobial agent by inhibiting bacterial... -
CORRECTANSWER cell wall synthesis.
Which class of eukaryotic microorganisms can be subdivided into groups such as
Mastigophora, Sarcodina, Ciliophora, and Apicomplexa? -CORRECTANSWER
Protozoa
, Genetic material can be excised from one chromosome and directly integrated into
another via... -CORRECTANSWER transposons
What immune cell secretes numerous cytokines that help to coordinate the response of
other immune cells? -CORRECTANSWER TH cell
What enzymes are used to amplify DNA during PCR? -CORRECTANSWER DNA
polymerase
Which of the following is a scientific name? -CORRECTANSWER Streptococcus
pyogenes
Eosin-methylene blue agar, or EMB, is a commonly used bacteriological medium for
growing gram-negative bacteria from complex environments. It contains two dyes, eosin
and methylene blue, as well as the sugar lactose. Eosin is a pH indicator that changes
color when the medium is acidic, while methylene blue inhibits the growth of most gram-
positive bacteria. If an organism consumes lactose, acid will be produced, causing the
bacterial colonies to change color.
Based upon this description, this medium is ______ -CORRECTANSWER differential
and selective
