COMPREHENSIVE MICROBIOLOGY TEST
REVIEW | OPENSTAX STUDY GUIDE FOR
EXAM SUCCESS
[Document subtitle]
, Comprehensive Microbiology Test Review |
OpenStax Study Guide for Exam Success
1. Which of the following types of microorganisms is photosynthetic?
a. Virus
b. Yeast
c. Alga ✅
d. Helminth
Rationale:
Algae are photosynthetic microorganisms that produce energy through photosynthesis,
similar to plants. Viruses, yeast (a type of fungi), and helminths (parasitic worms) are not
photosynthetic.
2. Which type of microscope would be the best choice for viewing very small surface
structures of a cell?
a. Transmission electron microscope
b. Phase-contrast microscope
c. Brightfield microscope
d. Scanning electron microscope ✅
Rationale:
A scanning electron microscope (SEM) is ideal for examining surface structures because it
provides detailed, three-dimensional images by scanning a sample with an electron beam.
3. Which type of cytoskeletal fiber is important in the formation of the nuclear lamina?
a. Microfilaments
b. Fibronectin
c. Intermediate filaments ✅
d. Microtubules
1
,Rationale:
Intermediate filaments provide structural support to the nucleus and form the nuclear
lamina, which maintains the shape and integrity of the nuclear envelope.
4. Which of the following bacterial species is classified as high G+C gram-positive?
a. Staphylococcus aureus
b. Bacillus anthracis
c. Streptococcus pneumoniae
d. Corynebacterium diphtheriae ✅
Rationale:
Corynebacterium diphtheriae belongs to the high G+C gram-positive bacteria, which have
a higher guanine-cytosine content in their DNA compared to low G+C gram-positive
bacteria.
5. A fluke is classified within which of the following?
a. Annelida
b. Rotifera
c. Nematoda
d. Platyhelminthes ✅
Rationale:
Flukes are parasitic flatworms classified under Platyhelminthes. They differ from
nematodes (roundworms) and annelids (segmented worms).
6. A non-segmented worm is found during a routine colonoscopy of an individual who
reported having abdominal cramps, nausea, and vomiting. This worm is likely which of
the following?
a. Trematode
b. Annelid
c. Fluke
d. Nematode ✅
2
, Rationale:
Nematodes (roundworms) are non-segmented and can cause intestinal infections.
Trematodes (flukes) are flatworms, and annelids are segmented worms.
7. Which of the following characteristics/compounds is not considered to be a
phenotypic biochemical characteristic used for microbial identification?
a. Carbon utilization
b. Poly-β-hydroxybutyrate
c. Lipid composition
d. Small-subunit (16S) rRNA gene ✅
Rationale:
The small-subunit (16S) rRNA gene is used for genetic identification of microbes rather
than phenotypic biochemical testing.
8. In prokaryotes, in which direction are hydrogen ions pumped by the electron
transport system of photosynthetic membranes?
a. To the stroma
b. To the intermembrane space of the chloroplast
c. To the outside of the plasma membrane ✅
d. To the inside (cytoplasm) of the cell
Rationale:
In prokaryotic photosynthetic membranes, hydrogen ions are pumped to the outside of the
plasma membrane to create a proton gradient that drives ATP synthesis.
9. Which of the following are two products of the light-dependent reactions?
a. NADPH and ATP ✅
b. Glucose and oxygen
c. Glyceraldehyde 3-phosphate and CO₂
d. Glucose and NADPH
Rationale:
The light-dependent reactions of photosynthesis produce NADPH and ATP, which are used
in the Calvin cycle to generate glucose.
3
REVIEW | OPENSTAX STUDY GUIDE FOR
EXAM SUCCESS
[Document subtitle]
, Comprehensive Microbiology Test Review |
OpenStax Study Guide for Exam Success
1. Which of the following types of microorganisms is photosynthetic?
a. Virus
b. Yeast
c. Alga ✅
d. Helminth
Rationale:
Algae are photosynthetic microorganisms that produce energy through photosynthesis,
similar to plants. Viruses, yeast (a type of fungi), and helminths (parasitic worms) are not
photosynthetic.
2. Which type of microscope would be the best choice for viewing very small surface
structures of a cell?
a. Transmission electron microscope
b. Phase-contrast microscope
c. Brightfield microscope
d. Scanning electron microscope ✅
Rationale:
A scanning electron microscope (SEM) is ideal for examining surface structures because it
provides detailed, three-dimensional images by scanning a sample with an electron beam.
3. Which type of cytoskeletal fiber is important in the formation of the nuclear lamina?
a. Microfilaments
b. Fibronectin
c. Intermediate filaments ✅
d. Microtubules
1
,Rationale:
Intermediate filaments provide structural support to the nucleus and form the nuclear
lamina, which maintains the shape and integrity of the nuclear envelope.
4. Which of the following bacterial species is classified as high G+C gram-positive?
a. Staphylococcus aureus
b. Bacillus anthracis
c. Streptococcus pneumoniae
d. Corynebacterium diphtheriae ✅
Rationale:
Corynebacterium diphtheriae belongs to the high G+C gram-positive bacteria, which have
a higher guanine-cytosine content in their DNA compared to low G+C gram-positive
bacteria.
5. A fluke is classified within which of the following?
a. Annelida
b. Rotifera
c. Nematoda
d. Platyhelminthes ✅
Rationale:
Flukes are parasitic flatworms classified under Platyhelminthes. They differ from
nematodes (roundworms) and annelids (segmented worms).
6. A non-segmented worm is found during a routine colonoscopy of an individual who
reported having abdominal cramps, nausea, and vomiting. This worm is likely which of
the following?
a. Trematode
b. Annelid
c. Fluke
d. Nematode ✅
2
, Rationale:
Nematodes (roundworms) are non-segmented and can cause intestinal infections.
Trematodes (flukes) are flatworms, and annelids are segmented worms.
7. Which of the following characteristics/compounds is not considered to be a
phenotypic biochemical characteristic used for microbial identification?
a. Carbon utilization
b. Poly-β-hydroxybutyrate
c. Lipid composition
d. Small-subunit (16S) rRNA gene ✅
Rationale:
The small-subunit (16S) rRNA gene is used for genetic identification of microbes rather
than phenotypic biochemical testing.
8. In prokaryotes, in which direction are hydrogen ions pumped by the electron
transport system of photosynthetic membranes?
a. To the stroma
b. To the intermembrane space of the chloroplast
c. To the outside of the plasma membrane ✅
d. To the inside (cytoplasm) of the cell
Rationale:
In prokaryotic photosynthetic membranes, hydrogen ions are pumped to the outside of the
plasma membrane to create a proton gradient that drives ATP synthesis.
9. Which of the following are two products of the light-dependent reactions?
a. NADPH and ATP ✅
b. Glucose and oxygen
c. Glyceraldehyde 3-phosphate and CO₂
d. Glucose and NADPH
Rationale:
The light-dependent reactions of photosynthesis produce NADPH and ATP, which are used
in the Calvin cycle to generate glucose.
3
