STRAIGHTERLINE MICROBIOLOGY 250
COMPREHENSIVE EXAMINATION TEST
2026 QUESTIONS AND SOLUTIONS
GRADED A+
◉ 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.
Answer: 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.
Answer: 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.
Answer: 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.
Answer: Photons
◉ What is a characteristic of aerobic respiration?.
Answer: 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?.
Answer: "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?.
Answer: 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?.
Answer: They have a high risk for infection due to frequent contact.
,◉ Penicillin functions as an antimicrobial agent by inhibiting
bacterial....
Answer: cell wall synthesis.
◉ Which class of eukaryotic microorganisms can be subdivided into
groups such as Mastigophora, Sarcodina, Ciliophora, and
Apicomplexa?.
Answer: Protozoa
◉ Genetic material can be excised from one chromosome and
directly integrated into another via....
Answer: transposons
◉ What immune cell secretes numerous cytokines that help to
coordinate the response of other immune cells?.
Answer: TH cell
◉ What enzymes are used to amplify DNA during PCR?.
Answer: DNA polymerase
◉ Which of the following is a scientific name?.
Answer: 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 ______.
Answer: differential and selective
◉ A diagram of the three domains (Bacteria, Archaea, Eukarya)
proceeding from the Last Universal Common Ancestor would show
Archaea.
Answer: branching off the Domain Eukarya.
◉ In the cell cytoplasm, molecules of ATP are a.
Answer: solute
◉ The _____ of the microscope holds and allows selection of the
objective lenses..
Answer: nosepiece
◉ Characteristics shared by all cells include.
COMPREHENSIVE EXAMINATION TEST
2026 QUESTIONS AND SOLUTIONS
GRADED A+
◉ 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.
Answer: 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.
Answer: 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.
Answer: 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.
Answer: Photons
◉ What is a characteristic of aerobic respiration?.
Answer: 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?.
Answer: "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?.
Answer: 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?.
Answer: They have a high risk for infection due to frequent contact.
,◉ Penicillin functions as an antimicrobial agent by inhibiting
bacterial....
Answer: cell wall synthesis.
◉ Which class of eukaryotic microorganisms can be subdivided into
groups such as Mastigophora, Sarcodina, Ciliophora, and
Apicomplexa?.
Answer: Protozoa
◉ Genetic material can be excised from one chromosome and
directly integrated into another via....
Answer: transposons
◉ What immune cell secretes numerous cytokines that help to
coordinate the response of other immune cells?.
Answer: TH cell
◉ What enzymes are used to amplify DNA during PCR?.
Answer: DNA polymerase
◉ Which of the following is a scientific name?.
Answer: 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 ______.
Answer: differential and selective
◉ A diagram of the three domains (Bacteria, Archaea, Eukarya)
proceeding from the Last Universal Common Ancestor would show
Archaea.
Answer: branching off the Domain Eukarya.
◉ In the cell cytoplasm, molecules of ATP are a.
Answer: solute
◉ The _____ of the microscope holds and allows selection of the
objective lenses..
Answer: nosepiece
◉ Characteristics shared by all cells include.
