K
C
MICROBIOLOGY, CH 22,
LO
NESTER'S 9TH EXAMINATION
PRACTICE QUESTIONS AND
YC
CORRECT DETAILED
D
ANSWERS LATEST UPDATE
U
ST
,The Rickettsial disease that killed Howard Ricketts and Stanislaus Prowazek was:
A) louse-borne typhus.
B) tick-borne typhus.
C) yellow fever.
D) bubonic plague.
E) unidentified. - ANS - louse-borne typhus
Ricketts studied Rocky Mountain spotted fever (RMSF) but was unable to grow it on lab
media . He went on to study a similar LOUSE-BORNE TYPHUS which he got and died
from.
K
- Stanislaus Prowazek, studying same disease, met same fate at nearly the same age
- Louse-borne typhus named Rickettsia prowazekii
C
- Agent of RMSF named Rickettsia rickettsii
Which of the following is an important function of the skin?
LO
A) Hold muscle to bone
B) Manufacture blood cells
C) Produce antibodies
D) Control body temperature
E) All of the answer choices are correct. - ANS - Control body temperature
YC
Tough but flexible.
- Serves as a blood reservoir, barrier to keep things in/out = primary defense along with
mucus membranes.
Skin: prevents entry, regulates body temperature, restricts fluid loss, senses the
D
environment
U
Which of the following is considered a function of skin?
A) Regulation of body temperature
B) Prevention of fluid loss
ST
C) Synthesis of vitamin D
D) Production of cytokines
E) All of the choices are correct. - ANS - All of the choices are correct.
A and B definitely, C I think so and at that point it has to be ALL.
The surface layer of the skin is the:
A) cutaneous.
B) keratin.
C) epidermis.
,D) dermis.
E) hypodermis. - ANS - epidermis
Epidermis: SURFACE LAYER made from layers of flat cells • Outermost =dead,filled
with water-resistant keratin • Constantly flake off and replaced
• Dermis: nerves, glands, blood and lymphatic vessels
• Subcutaneous tissue: fat, other cells that support skin
The oily layer that lubricates the hair follicles of the skin is:
A) suder.
K
B) eczema.
C) sebum.
C
D) acnus.
E) mucus. - ANS - sebum
LO
Made by sebaceous glands open into hair follicles, moves up the hair to the outside,
keeps hair and skin soft and water-repellent.
The secretions of the sweat and sebaceous glands provide ________ to the microbiota.
A) water
YC
B) amino acids OR water
C) lipids AND amino acids
D) water, amino acids, AND lipids
E) sebum OR amino acids - ANS - water, amino acids, AND lipids
D
They break down lipids into fatty acids and glycerol for food. Also, these products toxic
to other bacteria. Break down proteins too.
U
The secretions of the sweat and sebaceous glands provide ________ to the microbiota.
A. water
ST
B. amino acids
C. lipids
D. All of the choices are correct. - ANS All of the choices are correct.
Use substances in sweat, sebum as nutrients; byproducts inhibit other microbes.
The antimicrobial aspect(s) of the skin is/are:
A. dryness.
B. saltiness.
C. acidity.
, D. toxicity.
E. All of the choices are correct. - ANS All of the choices are correct.
Too dry, salty, acidic, and toxic for most pathogens - Those that tolerate often shed with
dead skin cells.
The antimicrobial aspect(s) of the skin is/are:
A. dead layers.
B. saltiness.
C. acidity.
K
D. antimicrobial peptides.
E. All of the choices are correct. - ANS All of the choices are correct.
C
Who would have larger numbers of bacteria living on the surface of their skin—a person
living in the tropics or in the desert, and why?
LO
A) The tropics would provide more shade, so the surface of the skin wouldn't be
exposed to high levels of ultraviolet radiation. This would protect the bacteria on the
skin, and they would have higher numbers due to this shading effect.
B) The very low humidity of the desert would lead to rapid evaporation of sweat and
sebum from an individual's skin. Bacteria need these secretions for a nutrient source.
YC
Without them, bacteria would be found in much lower numbers on the skin of a person
in the desert than the skin of the person in the tropics.
C) The constant secretion of high amounts of sweat would produce a highly salty
environment on the skin of a person in the tropics. This would provide a local
environment that would be too hostile for microbes to survive, so the number of micro -
D
ANS The very low humidity of the desert would lead to rapid evaporation of sweat and
sebum from an individual's skin. Bacteria need these secretions for a nutrient source.
U
Without them, bacteria would be found in much lower numbers on the skin of a person
in the desert than the skin of the person in the tropics.
ST
I choose the tropics.
A is goofy - wrong
C - skin is left salty when sweat evaporates - which it would in the DESERT - wrong
D - those bacteria are stuck on - not getting washed off with sweat. wrong
E - desert doesn't have high humidity - wrong
Which of the following organisms is not normally found on the skin?
A) Staphylococci
B) Diphtheroids
C) Candida species
C
MICROBIOLOGY, CH 22,
LO
NESTER'S 9TH EXAMINATION
PRACTICE QUESTIONS AND
YC
CORRECT DETAILED
D
ANSWERS LATEST UPDATE
U
ST
,The Rickettsial disease that killed Howard Ricketts and Stanislaus Prowazek was:
A) louse-borne typhus.
B) tick-borne typhus.
C) yellow fever.
D) bubonic plague.
E) unidentified. - ANS - louse-borne typhus
Ricketts studied Rocky Mountain spotted fever (RMSF) but was unable to grow it on lab
media . He went on to study a similar LOUSE-BORNE TYPHUS which he got and died
from.
K
- Stanislaus Prowazek, studying same disease, met same fate at nearly the same age
- Louse-borne typhus named Rickettsia prowazekii
C
- Agent of RMSF named Rickettsia rickettsii
Which of the following is an important function of the skin?
LO
A) Hold muscle to bone
B) Manufacture blood cells
C) Produce antibodies
D) Control body temperature
E) All of the answer choices are correct. - ANS - Control body temperature
YC
Tough but flexible.
- Serves as a blood reservoir, barrier to keep things in/out = primary defense along with
mucus membranes.
Skin: prevents entry, regulates body temperature, restricts fluid loss, senses the
D
environment
U
Which of the following is considered a function of skin?
A) Regulation of body temperature
B) Prevention of fluid loss
ST
C) Synthesis of vitamin D
D) Production of cytokines
E) All of the choices are correct. - ANS - All of the choices are correct.
A and B definitely, C I think so and at that point it has to be ALL.
The surface layer of the skin is the:
A) cutaneous.
B) keratin.
C) epidermis.
,D) dermis.
E) hypodermis. - ANS - epidermis
Epidermis: SURFACE LAYER made from layers of flat cells • Outermost =dead,filled
with water-resistant keratin • Constantly flake off and replaced
• Dermis: nerves, glands, blood and lymphatic vessels
• Subcutaneous tissue: fat, other cells that support skin
The oily layer that lubricates the hair follicles of the skin is:
A) suder.
K
B) eczema.
C) sebum.
C
D) acnus.
E) mucus. - ANS - sebum
LO
Made by sebaceous glands open into hair follicles, moves up the hair to the outside,
keeps hair and skin soft and water-repellent.
The secretions of the sweat and sebaceous glands provide ________ to the microbiota.
A) water
YC
B) amino acids OR water
C) lipids AND amino acids
D) water, amino acids, AND lipids
E) sebum OR amino acids - ANS - water, amino acids, AND lipids
D
They break down lipids into fatty acids and glycerol for food. Also, these products toxic
to other bacteria. Break down proteins too.
U
The secretions of the sweat and sebaceous glands provide ________ to the microbiota.
A. water
ST
B. amino acids
C. lipids
D. All of the choices are correct. - ANS All of the choices are correct.
Use substances in sweat, sebum as nutrients; byproducts inhibit other microbes.
The antimicrobial aspect(s) of the skin is/are:
A. dryness.
B. saltiness.
C. acidity.
, D. toxicity.
E. All of the choices are correct. - ANS All of the choices are correct.
Too dry, salty, acidic, and toxic for most pathogens - Those that tolerate often shed with
dead skin cells.
The antimicrobial aspect(s) of the skin is/are:
A. dead layers.
B. saltiness.
C. acidity.
K
D. antimicrobial peptides.
E. All of the choices are correct. - ANS All of the choices are correct.
C
Who would have larger numbers of bacteria living on the surface of their skin—a person
living in the tropics or in the desert, and why?
LO
A) The tropics would provide more shade, so the surface of the skin wouldn't be
exposed to high levels of ultraviolet radiation. This would protect the bacteria on the
skin, and they would have higher numbers due to this shading effect.
B) The very low humidity of the desert would lead to rapid evaporation of sweat and
sebum from an individual's skin. Bacteria need these secretions for a nutrient source.
YC
Without them, bacteria would be found in much lower numbers on the skin of a person
in the desert than the skin of the person in the tropics.
C) The constant secretion of high amounts of sweat would produce a highly salty
environment on the skin of a person in the tropics. This would provide a local
environment that would be too hostile for microbes to survive, so the number of micro -
D
ANS The very low humidity of the desert would lead to rapid evaporation of sweat and
sebum from an individual's skin. Bacteria need these secretions for a nutrient source.
U
Without them, bacteria would be found in much lower numbers on the skin of a person
in the desert than the skin of the person in the tropics.
ST
I choose the tropics.
A is goofy - wrong
C - skin is left salty when sweat evaporates - which it would in the DESERT - wrong
D - those bacteria are stuck on - not getting washed off with sweat. wrong
E - desert doesn't have high humidity - wrong
Which of the following organisms is not normally found on the skin?
A) Staphylococci
B) Diphtheroids
C) Candida species
