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BIO 251 EXAM 3 LATEST 2026 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
Suppose that an antibody binds to a toxin molecule and prevents
the toxin from binding to a receptor where it would have a
negative effect. This is an example of:
Immobilization
Opsonization
Neutralization
Cross-linking - ANSWER-Neutralization
Which of the following is NOT a way that antibodies assist the
immune system in getting rid of pathogens?
A. Binding to viral coat proteins and preventing them from being
able to enter cells
B. Labeling pathogens for phagocytosis
C. Binding to flagella and fimbrae and preventing movement and
adherence.
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D. Poking holes in the cell membrane and lysing bacteria directly -
ANSWER-D. Poking holes in the cell membrane and lysing
bacteria directly
Which of the following would be an example of a PAMP?
Correct answer:
A. Peptidoglycan
B. Tissue factor
C. GaGs on the surface of eukaryotic cells
D. C3b bound to bacteria - ANSWER-A. Peptidoglycan
Match the antibody with the correct description
Antibody involved in allergic reactions
Antibody found abundantly in mucous secretions
First antibody produced in response to an infection
Antibody with poorly understood function
Antibody that penetrates the placenta
IgG
IgE
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IgA
IgM
IgD - ANSWER-Antibody involved in allergic reactions
Correct match:
IgE
Antibody found abundantly in mucous secretions
Correct match:
IgA
First antibody produced in response to an infection
Correct match:
IgM
Antibody with poorly understood function
Correct match:
IgD
Antibody that penetrates the placenta
Correct match:
IgG
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What event during inflammation is responsible for swelling?
A. Vasodilation
B. Diapedesis
C. Increased sensitivity of nociceptors
D. Increasing vascular permeability - ANSWER-D. Increasing
vascular permeability-
Put the steps of phagocytosis in order
Chemotaxis
Engulfment (endocytosis)
Exocytosis
Recognition and attachment
Phagosome maturation and phagolysosome formation
Destruction and digestion - ANSWER-Chemotaxis
Recognition and attachment
Engulfment (endocytosis)
Phagosome maturation and phagolysosome formation
Destruction and digestion
BIO 251 EXAM 3 LATEST 2026 ACTUAL EXAM WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS (100% VERIFIED
ANSWERS) |ALREADY GRADED A+| ||PROFESSOR VERIFIED||
||BRANDNEW!!!||
Suppose that an antibody binds to a toxin molecule and prevents
the toxin from binding to a receptor where it would have a
negative effect. This is an example of:
Immobilization
Opsonization
Neutralization
Cross-linking - ANSWER-Neutralization
Which of the following is NOT a way that antibodies assist the
immune system in getting rid of pathogens?
A. Binding to viral coat proteins and preventing them from being
able to enter cells
B. Labeling pathogens for phagocytosis
C. Binding to flagella and fimbrae and preventing movement and
adherence.
,2|Page
D. Poking holes in the cell membrane and lysing bacteria directly -
ANSWER-D. Poking holes in the cell membrane and lysing
bacteria directly
Which of the following would be an example of a PAMP?
Correct answer:
A. Peptidoglycan
B. Tissue factor
C. GaGs on the surface of eukaryotic cells
D. C3b bound to bacteria - ANSWER-A. Peptidoglycan
Match the antibody with the correct description
Antibody involved in allergic reactions
Antibody found abundantly in mucous secretions
First antibody produced in response to an infection
Antibody with poorly understood function
Antibody that penetrates the placenta
IgG
IgE
,3|Page
IgA
IgM
IgD - ANSWER-Antibody involved in allergic reactions
Correct match:
IgE
Antibody found abundantly in mucous secretions
Correct match:
IgA
First antibody produced in response to an infection
Correct match:
IgM
Antibody with poorly understood function
Correct match:
IgD
Antibody that penetrates the placenta
Correct match:
IgG
, 4|Page
What event during inflammation is responsible for swelling?
A. Vasodilation
B. Diapedesis
C. Increased sensitivity of nociceptors
D. Increasing vascular permeability - ANSWER-D. Increasing
vascular permeability-
Put the steps of phagocytosis in order
Chemotaxis
Engulfment (endocytosis)
Exocytosis
Recognition and attachment
Phagosome maturation and phagolysosome formation
Destruction and digestion - ANSWER-Chemotaxis
Recognition and attachment
Engulfment (endocytosis)
Phagosome maturation and phagolysosome formation
Destruction and digestion
