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BIOS 251 EXAM 2 EXAM WITH CORRECT
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+ 2025 – 2026
Which of the following statements about how the skin prevents disease is false?
a) salt in sweat retards microbial growth
b) the skin is the most common route for organisms to penetrate the body
c) oil glands on the skin make it waterproof
d) native microbes that live on your skin help protect you from infection -
(ANSWER)b) the skin is the most common route for organisms to penetrate the
body
This antimicrobial protein is found at high levels in lacrimal secretions (tears)
a) lysozyme
b) defensins
c) sebum
d) C3b - (ANSWER)a) lysozyme
Which component of the compliment system would stimulate neutrophils to
phagocytize an attached cell?
a) C5a
b) C5b
, 2
c) C3a
d) C3b - (ANSWER)d) C3b
Which of the following would prevent a microbe from activating the Alternative
pathway of the compliment system?
a) a bacteria that has an enzyme that degrades antibodies
b) a bacteria that has a thick cell wall
c) a bacteria that can prevent C3b from binding to it
d) a bacteria that contain no mannose - (ANSWER)c) a bacteria that can prevent
C3b from binding to it
Which of the following is NOT a feature of the skin that allows it to serve as a
barrier to infection?
a) melanin in the skin is toxic to a bacteria
b) sweat creates a sling environment that prevents non-halotolerant bacteria
from growing
c) tight junctions in keratinocytes make the skin waterproof
d) resident flora produce bacteriocins - (ANSWER)a) melanin in the skin is toxic to
a bacteria
The immune system cell most commonly associated with allergies is:
a) neutrophil
b) eosinophil
, 3
c) basophil
d) macrophage - (ANSWER)c) basophil
Which of the following would be an example of a PAMP?
a) GaGs on the surface of eukaryotic of a PAMP
b) C3b bound to bacteria
c) peptidoglycan
d) tissue factor - (ANSWER)c) peptidoglycan
This cytokine is released by virally infected cells, anti-viral - (ANSWER)interferon
Suppose that someone's blood stem cells in their marrow ware dividing and
developing into B cells. What cytokine might be responsible for this?
a) chemokines
b) tumor necrosis factor
c) colony stimulating factor
d) interferon - (ANSWER)c) colony stimulating factor
Which of the following cells would likely have Toll-like receptors (TLRs)?
a) mast cells
b) dendritic cells
c) neutrophils
BIOS 251 EXAM 2 EXAM WITH CORRECT
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+ 2025 – 2026
Which of the following statements about how the skin prevents disease is false?
a) salt in sweat retards microbial growth
b) the skin is the most common route for organisms to penetrate the body
c) oil glands on the skin make it waterproof
d) native microbes that live on your skin help protect you from infection -
(ANSWER)b) the skin is the most common route for organisms to penetrate the
body
This antimicrobial protein is found at high levels in lacrimal secretions (tears)
a) lysozyme
b) defensins
c) sebum
d) C3b - (ANSWER)a) lysozyme
Which component of the compliment system would stimulate neutrophils to
phagocytize an attached cell?
a) C5a
b) C5b
, 2
c) C3a
d) C3b - (ANSWER)d) C3b
Which of the following would prevent a microbe from activating the Alternative
pathway of the compliment system?
a) a bacteria that has an enzyme that degrades antibodies
b) a bacteria that has a thick cell wall
c) a bacteria that can prevent C3b from binding to it
d) a bacteria that contain no mannose - (ANSWER)c) a bacteria that can prevent
C3b from binding to it
Which of the following is NOT a feature of the skin that allows it to serve as a
barrier to infection?
a) melanin in the skin is toxic to a bacteria
b) sweat creates a sling environment that prevents non-halotolerant bacteria
from growing
c) tight junctions in keratinocytes make the skin waterproof
d) resident flora produce bacteriocins - (ANSWER)a) melanin in the skin is toxic to
a bacteria
The immune system cell most commonly associated with allergies is:
a) neutrophil
b) eosinophil
, 3
c) basophil
d) macrophage - (ANSWER)c) basophil
Which of the following would be an example of a PAMP?
a) GaGs on the surface of eukaryotic of a PAMP
b) C3b bound to bacteria
c) peptidoglycan
d) tissue factor - (ANSWER)c) peptidoglycan
This cytokine is released by virally infected cells, anti-viral - (ANSWER)interferon
Suppose that someone's blood stem cells in their marrow ware dividing and
developing into B cells. What cytokine might be responsible for this?
a) chemokines
b) tumor necrosis factor
c) colony stimulating factor
d) interferon - (ANSWER)c) colony stimulating factor
Which of the following cells would likely have Toll-like receptors (TLRs)?
a) mast cells
b) dendritic cells
c) neutrophils
