Straighterline Microbiology 250 final Exam 2025
Questions and Answers
C. Protozoa are a diverse group of organisms that often prove difficult to classify into a
taxonomy. - ANS-Which class of eukaryotic microorganisms can be subdivided into
groups such as Mastigophora, Sarcodina, Ciliophora, and Apicomplexa?
A. Helminths
B. Algae
C. Protozoa
D. Fungi
D. Transposons contain DNA that codes for enzymes that remove it from one site in the
genome and integrate it into another. - ANS-Genetic material can be excised from one
chromosome and directly integrated into another via
A. conjugation.
B. transformation.
C. transduction.
D. transposons.
B. TH (or T Helper) cells mature in the thymus and become sensitized when it binds to
an antigen/MHC complex. Upon activation, it releases interleukins-2, -4, -5, and -6, and
interferon gamma which help to activate macrophages, B cells, and TC cells. - ANS-
Which immune cell secretes numerous cytokines that help to coordinate the response of
other immune cells?
A. B cell
B. TH cell
C. TC cell
D. Platelets
B. DNA polymerase works during the extension stage of PCR by elongating a DNA
primer with nucleotides complementary to the template strand. - ANS-Which of the
following enzymes are used to amplify DNA during PCR?
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase
d. nitrogen fixation
In nitrogen fixation, nitrogen in removed from the atmosphere by nitrogen-fixing bacteria
and converted to ammonia. - ANS-In the nitrogen cycle, which of the following steps
involves removal of nitrogen from the atmosphere by bacteria?
Select one:
a. ammonification
b. denitrification
c. nitrification
Questions and Answers
C. Protozoa are a diverse group of organisms that often prove difficult to classify into a
taxonomy. - ANS-Which class of eukaryotic microorganisms can be subdivided into
groups such as Mastigophora, Sarcodina, Ciliophora, and Apicomplexa?
A. Helminths
B. Algae
C. Protozoa
D. Fungi
D. Transposons contain DNA that codes for enzymes that remove it from one site in the
genome and integrate it into another. - ANS-Genetic material can be excised from one
chromosome and directly integrated into another via
A. conjugation.
B. transformation.
C. transduction.
D. transposons.
B. TH (or T Helper) cells mature in the thymus and become sensitized when it binds to
an antigen/MHC complex. Upon activation, it releases interleukins-2, -4, -5, and -6, and
interferon gamma which help to activate macrophages, B cells, and TC cells. - ANS-
Which immune cell secretes numerous cytokines that help to coordinate the response of
other immune cells?
A. B cell
B. TH cell
C. TC cell
D. Platelets
B. DNA polymerase works during the extension stage of PCR by elongating a DNA
primer with nucleotides complementary to the template strand. - ANS-Which of the
following enzymes are used to amplify DNA during PCR?
A. restriction endonuclease
B. DNA polymerase
C. reverse transcriptase
D. DNA ligase
d. nitrogen fixation
In nitrogen fixation, nitrogen in removed from the atmosphere by nitrogen-fixing bacteria
and converted to ammonia. - ANS-In the nitrogen cycle, which of the following steps
involves removal of nitrogen from the atmosphere by bacteria?
Select one:
a. ammonification
b. denitrification
c. nitrification
