BIO 251 EXAM 2 NEWEST ACTUAL EXAM COMPLETE 100
QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A
1. 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: b) the skin is
the most common route for organisms to penetrate the body
2. This antimicrobial protein is found at high levels in lacrimal secretions
(tears)
a) Lysozyme
b) Defensins
c) Sebum
d) C3b: a) lysozyme
3. Which component of the compliment system would stimulate neutrophils to
phagocytize an attached cell? A) c5a
b) C5b
c) C3a
d) C3b: d) c3b
4. 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: c) a bacteria that can prevent c3b from binding
to it
5. 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: a) melanin in the skin is toxic to a bacteria
6. The immune system cell most commonly associated with allergies is:
a) neutrophil
, .
b) Eosinophil
c) Basophil
d) Macrophage: c) basophil
7. 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: c) peptidoglycan
8. This cytokine is released by virally infected cells, anti-viral: interferon
9. 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: c) colony stimulating factor
10. Which of the following cells would likely have toll-like receptors (tlrs)?
A) mast cells
b) Dendritic cells
c) Neutrophils
d) T-lymphocytes
e) Hepatocytes: mast cells, dendritic cells
11. Which of the following would be most likely to be detected by a rig-like
receptor (rlr)
a) Bacterial dna
b) Helminth proteins
c) Double stranded rna
d) Lps: c) double stranded rna
12. What event during inflammation is responsible for swelling? A)
diapedesis
b) Increasing vascular permeability
c) Vasodilation
d) Increased sensitivity of nociceptors: b) increasing vascular permeability
13. Put the steps of phagocytosis in order.
Chemotaxis
Exocytosis
Recognition and attachment
Engulfment (endocytosis)
Destruction and digestion
QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A
1. 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: b) the skin is
the most common route for organisms to penetrate the body
2. This antimicrobial protein is found at high levels in lacrimal secretions
(tears)
a) Lysozyme
b) Defensins
c) Sebum
d) C3b: a) lysozyme
3. Which component of the compliment system would stimulate neutrophils to
phagocytize an attached cell? A) c5a
b) C5b
c) C3a
d) C3b: d) c3b
4. 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: c) a bacteria that can prevent c3b from binding
to it
5. 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: a) melanin in the skin is toxic to a bacteria
6. The immune system cell most commonly associated with allergies is:
a) neutrophil
, .
b) Eosinophil
c) Basophil
d) Macrophage: c) basophil
7. 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: c) peptidoglycan
8. This cytokine is released by virally infected cells, anti-viral: interferon
9. 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: c) colony stimulating factor
10. Which of the following cells would likely have toll-like receptors (tlrs)?
A) mast cells
b) Dendritic cells
c) Neutrophils
d) T-lymphocytes
e) Hepatocytes: mast cells, dendritic cells
11. Which of the following would be most likely to be detected by a rig-like
receptor (rlr)
a) Bacterial dna
b) Helminth proteins
c) Double stranded rna
d) Lps: c) double stranded rna
12. What event during inflammation is responsible for swelling? A)
diapedesis
b) Increasing vascular permeability
c) Vasodilation
d) Increased sensitivity of nociceptors: b) increasing vascular permeability
13. Put the steps of phagocytosis in order.
Chemotaxis
Exocytosis
Recognition and attachment
Engulfment (endocytosis)
Destruction and digestion
