Portage Microbiology Final Exam
Questions with Certified Answers (
2025 -2026) | Grdaed A+ | 100 %
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Which organelle is responsible for protein synthesis?
A. Nucleus
B. Lysosome
C. Ribosome
D. Cytoplasm
Correct Answer: C
Rationale: Ribosomes are the cellular structures that assemble amino acids into proteins
based on genetic instructions.
Which organelle contains the genomic content of the cell?
A. Cytoplasm
B. Lysosome
C. Ribosome
D. Nucleus
Correct Answer: D
Rationale: The nucleus houses DNA, which contains the genetic information necessary for
cell function and inheritance.
Which component constitutes the open internal volume of the cell?
A. Nucleus
B. Cytoplasm
C. Lysosome
D. Ribosome
Correct Answer: B
Rationale: The cytoplasm fills the interior of the cell and surrounds organelles, allowing
cellular processes to occur.
,Which organelle contains hydrolytic enzymes used for intracellular digestion?
A. Ribosome
B. Cytoplasm
C. Lysosome
D. Nucleus
Correct Answer: C
Rationale: Lysosomes contain digestive enzymes that break down waste materials and
damaged cellular components.
How does a scanning electron microscope (SEM) form an image?
A. By passing light through the specimen
B. By detecting electrons transmitted through thin sections
C. By detecting electrons reflected off the specimen surface
D. By staining specimens with fluorescent dyes
Correct Answer: C
Rationale: SEM forms images by scanning a specimen with electrons that reflect off its
surface, producing detailed, three-dimensional images.
Why are samples coated with gold or palladium in SEM?
A. To preserve cellular structures
B. To prevent dehydration
C. To enhance electron reflection
D. To stain internal organelles
Correct Answer: C
Rationale: Metal coatings increase electron reflectivity, improving image clarity and
resolution in SEM.
Which organelle is best described as a series of membrane-enclosed sacs and
interconnected tubes?
A. Nucleus
B. Endoplasmic reticulum
C. Lysosome
D. Chloroplast
, Correct Answer: B
Rationale: The endoplasmic reticulum consists of membranous tubules and sacs involved in
protein and lipid synthesis.
Which organelle is the site of photosynthesis?
A. Mitochondria
B. Ribosome
C. Chloroplast
D. Lysosome
Correct Answer: C
Rationale: Chloroplasts contain chlorophyll and are responsible for converting light energy
into chemical energy in plant cells.
Which disease is correctly matched with its causative bacterial agent?
A. Bubonic plague – Legionella
B. Scalded skin syndrome – Staphylococcus aureus
C. Legionnaires’ disease – Yersinia pestis
D. Ophthalmia neonatorum – Legionella
Correct Answer: B
Rationale: Scalded skin syndrome is caused by toxin-producing strains of Staphylococcus
aureus.
Which bacterium causes bubonic plague?
A. Staphylococcus aureus
B. Legionella pneumophila
C. Yersinia pestis
D. Streptococcus pyogenes
Correct Answer: C
Rationale: Yersinia pestis is the bacterium responsible for bubonic plague, transmitted
primarily through flea bites.
Which disease is associated with Legionella species?
A. Ophthalmia neonatorum
B. Scalded skin syndrome
C. Bubonic plague
D. Legionnaires’ disease
Questions with Certified Answers (
2025 -2026) | Grdaed A+ | 100 %
Guaranteed | BRANDNEW!!!!
Which organelle is responsible for protein synthesis?
A. Nucleus
B. Lysosome
C. Ribosome
D. Cytoplasm
Correct Answer: C
Rationale: Ribosomes are the cellular structures that assemble amino acids into proteins
based on genetic instructions.
Which organelle contains the genomic content of the cell?
A. Cytoplasm
B. Lysosome
C. Ribosome
D. Nucleus
Correct Answer: D
Rationale: The nucleus houses DNA, which contains the genetic information necessary for
cell function and inheritance.
Which component constitutes the open internal volume of the cell?
A. Nucleus
B. Cytoplasm
C. Lysosome
D. Ribosome
Correct Answer: B
Rationale: The cytoplasm fills the interior of the cell and surrounds organelles, allowing
cellular processes to occur.
,Which organelle contains hydrolytic enzymes used for intracellular digestion?
A. Ribosome
B. Cytoplasm
C. Lysosome
D. Nucleus
Correct Answer: C
Rationale: Lysosomes contain digestive enzymes that break down waste materials and
damaged cellular components.
How does a scanning electron microscope (SEM) form an image?
A. By passing light through the specimen
B. By detecting electrons transmitted through thin sections
C. By detecting electrons reflected off the specimen surface
D. By staining specimens with fluorescent dyes
Correct Answer: C
Rationale: SEM forms images by scanning a specimen with electrons that reflect off its
surface, producing detailed, three-dimensional images.
Why are samples coated with gold or palladium in SEM?
A. To preserve cellular structures
B. To prevent dehydration
C. To enhance electron reflection
D. To stain internal organelles
Correct Answer: C
Rationale: Metal coatings increase electron reflectivity, improving image clarity and
resolution in SEM.
Which organelle is best described as a series of membrane-enclosed sacs and
interconnected tubes?
A. Nucleus
B. Endoplasmic reticulum
C. Lysosome
D. Chloroplast
, Correct Answer: B
Rationale: The endoplasmic reticulum consists of membranous tubules and sacs involved in
protein and lipid synthesis.
Which organelle is the site of photosynthesis?
A. Mitochondria
B. Ribosome
C. Chloroplast
D. Lysosome
Correct Answer: C
Rationale: Chloroplasts contain chlorophyll and are responsible for converting light energy
into chemical energy in plant cells.
Which disease is correctly matched with its causative bacterial agent?
A. Bubonic plague – Legionella
B. Scalded skin syndrome – Staphylococcus aureus
C. Legionnaires’ disease – Yersinia pestis
D. Ophthalmia neonatorum – Legionella
Correct Answer: B
Rationale: Scalded skin syndrome is caused by toxin-producing strains of Staphylococcus
aureus.
Which bacterium causes bubonic plague?
A. Staphylococcus aureus
B. Legionella pneumophila
C. Yersinia pestis
D. Streptococcus pyogenes
Correct Answer: C
Rationale: Yersinia pestis is the bacterium responsible for bubonic plague, transmitted
primarily through flea bites.
Which disease is associated with Legionella species?
A. Ophthalmia neonatorum
B. Scalded skin syndrome
C. Bubonic plague
D. Legionnaires’ disease
