LSU ENVS 2126 TEST 1 LOMNICKI COMPREHENSIVE
STUDY GUIDE COMPLETE QUESTIONS WITH 100%
VERIFIED ANSWERS
Table of Contents
Section Domain Approx. Page
Questions Reference
1 Microbial Structure 35 Page 1
2 Microbial Function 35 Page 5
3 Metabolism 35 Page 9
4 Genetics 35 Page 14
5 Growth 30 Page 19
6 Environmental 30 Page 22
Microbiology
SECTION 1: MICROBIAL STRUCTURE
1. Which of the following structures is primarily composed of
peptidoglycan?
A. Eukaryotic cell membrane
B. Bacterial cell wall
C. Archaeal flagella
D. Viral capsid
Correct Answer: B. Bacterial cell wall.
,Rationale: Peptidoglycan is a polymer consisting of sugars and amino
acids that forms a mesh-like layer outside the plasma membrane of
most bacteria, providing structural support.
2. Actin is found within _______.
A. eukaryotic microfilaments
B. prokaryotic flagella
C. bacterial cell walls
D. archaeal membranes
Correct Answer: A. eukaryotic microfilaments.
Rationale: Actin is a globular protein that forms microfilaments, which
are essential components of the eukaryotic cytoskeleton.
3. Which of the following is a unique feature of archaeal membranes
compared to bacterial membranes?
A. Presence of cholesterol
B. Ester-linked fatty acids
C. Ether-linked lipids
D. Presence of peptidoglycan
Correct Answer: C. Ether-linked lipids.
Rationale: Archaeal membranes are unique because they contain ether-
linked lipids, whereas bacterial and eukaryotic membranes contain
ester-linked lipids.
4. What is the primary function of the bacterial capsule?
A. Motility
B. Protection against phagocytosis
C. DNA transfer
D. Protein synthesis
Correct Answer: B. Protection against phagocytosis.
,Rationale: The capsule is a polysaccharide layer that surrounds some
bacterial cells, protecting them from engulfment by immune system
cells.
5. Which structure is responsible for bacterial motility?
A. Pili
B. Flagella
C. Capsule
D. Ribosomes
Correct Answer: B. Flagella.
Rationale: Flagella are long, whip-like appendages that rotate to propel
bacteria through liquid environments.
6. Which of the following is found in prokaryotic cells but not
eukaryotic cells?
A. Mitochondria
B. Nucleus
C. 70S Ribosomes
D. Golgi apparatus
Correct Answer: C. 70S Ribosomes.
Rationale: Prokaryotes have 70S ribosomes, while eukaryotes have 80S
ribosomes in their cytoplasm.
7. The lipopolysaccharide (LPS) layer is found in which type of cell
wall?
A. Gram-positive bacteria
B. Gram-negative bacteria
C. Archaea
D. Fungi
Correct Answer: B. Gram-negative bacteria.
, Rationale: LPS is a major component of the outer membrane of Gram-
negative bacteria.
8. What is the function of pili in bacteria?
A. Motility
B. Attachment and DNA transfer
C. Protein synthesis
D. Cell wall synthesis
Correct Answer: B. Attachment and DNA transfer.
Rationale: Pili facilitate attachment to surfaces and mediate the transfer
of genetic material during conjugation.
9. Which of the following describes the arrangement of flagella when
they are present all over the cell surface?
A. Monotrichous
B. Lophotrichous
C. Peritrichous
D. Amphitrichous
Correct Answer: C. Peritrichous.
Rationale: Peritrichous refers to flagella distributed all over the surface
of the bacterial cell.
10. Which component of the bacterial cell wall is targeted by
penicillin?
A. Lipopolysaccharide
B. Peptidoglycan cross-linking
C. Teichoic acids
D. Outer membrane proteins
Correct Answer: B. Peptidoglycan cross-linking.
STUDY GUIDE COMPLETE QUESTIONS WITH 100%
VERIFIED ANSWERS
Table of Contents
Section Domain Approx. Page
Questions Reference
1 Microbial Structure 35 Page 1
2 Microbial Function 35 Page 5
3 Metabolism 35 Page 9
4 Genetics 35 Page 14
5 Growth 30 Page 19
6 Environmental 30 Page 22
Microbiology
SECTION 1: MICROBIAL STRUCTURE
1. Which of the following structures is primarily composed of
peptidoglycan?
A. Eukaryotic cell membrane
B. Bacterial cell wall
C. Archaeal flagella
D. Viral capsid
Correct Answer: B. Bacterial cell wall.
,Rationale: Peptidoglycan is a polymer consisting of sugars and amino
acids that forms a mesh-like layer outside the plasma membrane of
most bacteria, providing structural support.
2. Actin is found within _______.
A. eukaryotic microfilaments
B. prokaryotic flagella
C. bacterial cell walls
D. archaeal membranes
Correct Answer: A. eukaryotic microfilaments.
Rationale: Actin is a globular protein that forms microfilaments, which
are essential components of the eukaryotic cytoskeleton.
3. Which of the following is a unique feature of archaeal membranes
compared to bacterial membranes?
A. Presence of cholesterol
B. Ester-linked fatty acids
C. Ether-linked lipids
D. Presence of peptidoglycan
Correct Answer: C. Ether-linked lipids.
Rationale: Archaeal membranes are unique because they contain ether-
linked lipids, whereas bacterial and eukaryotic membranes contain
ester-linked lipids.
4. What is the primary function of the bacterial capsule?
A. Motility
B. Protection against phagocytosis
C. DNA transfer
D. Protein synthesis
Correct Answer: B. Protection against phagocytosis.
,Rationale: The capsule is a polysaccharide layer that surrounds some
bacterial cells, protecting them from engulfment by immune system
cells.
5. Which structure is responsible for bacterial motility?
A. Pili
B. Flagella
C. Capsule
D. Ribosomes
Correct Answer: B. Flagella.
Rationale: Flagella are long, whip-like appendages that rotate to propel
bacteria through liquid environments.
6. Which of the following is found in prokaryotic cells but not
eukaryotic cells?
A. Mitochondria
B. Nucleus
C. 70S Ribosomes
D. Golgi apparatus
Correct Answer: C. 70S Ribosomes.
Rationale: Prokaryotes have 70S ribosomes, while eukaryotes have 80S
ribosomes in their cytoplasm.
7. The lipopolysaccharide (LPS) layer is found in which type of cell
wall?
A. Gram-positive bacteria
B. Gram-negative bacteria
C. Archaea
D. Fungi
Correct Answer: B. Gram-negative bacteria.
, Rationale: LPS is a major component of the outer membrane of Gram-
negative bacteria.
8. What is the function of pili in bacteria?
A. Motility
B. Attachment and DNA transfer
C. Protein synthesis
D. Cell wall synthesis
Correct Answer: B. Attachment and DNA transfer.
Rationale: Pili facilitate attachment to surfaces and mediate the transfer
of genetic material during conjugation.
9. Which of the following describes the arrangement of flagella when
they are present all over the cell surface?
A. Monotrichous
B. Lophotrichous
C. Peritrichous
D. Amphitrichous
Correct Answer: C. Peritrichous.
Rationale: Peritrichous refers to flagella distributed all over the surface
of the bacterial cell.
10. Which component of the bacterial cell wall is targeted by
penicillin?
A. Lipopolysaccharide
B. Peptidoglycan cross-linking
C. Teichoic acids
D. Outer membrane proteins
Correct Answer: B. Peptidoglycan cross-linking.
