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The molecule of the extracellular matrix of animal cells that is associated with joint lubrication and friction reduction is


A) fibronectin.
B) pectin.
C) glycosaminoglycan.
D) hyaluronate.
E) proteoglycan.

F) A) and B)
G) All of the above

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Which of the following components is NOT associated with the primary cell wall?


A) pectins
B) hemicelluloses
C) lignins
D) cellulose microfibrils
E) glycoproteins

F) A) and D)
G) A) and C)

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The autoimmune response to desmosomes or desmosomal components (not hemidesmosomes) leads to a blistering skin disease known as


A) Ehlers- Danos syndrome.
B) listeriosis.
C) syndecan.
D) junctional epidermolysis bullosa.
E) pemphigus.

F) A) and C)
G) B) and C)

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Which of the following is NOT associated with adhesive junctions?


A) cadherins
B) plaques
C) connexin
D) desmosomes
E) hemidesmosomes

F) A) and B)
G) C) and D)

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Which of the following is correctly paired with regard to similarity in function?


A) plaques- plasmodesmata
B) tight junctions- gap junctions
C) connexons- desmosomes
D) adhesive junctions- tight junctions
E) desmotubule- gap junction

F) B) and E)
G) A) and B)

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Cadherins are associated with junctions.

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You are investigating a clinical disorder in one of your patients. You discover that the patient has an autoimmune disease that targets and destroys fibroblasts. This disorder would most likely affect


A) fiber production by the cells, as occurs with blood clotting.
B) hyluronate production in the joints.
C) collagen production.
D) annulus formation.
E) all of the above

F) A) and B)
G) A) and C)

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A collection of fibrous intracellular attachment proteins is called a(n)


A) connexon.
B) annulus.
C) plaque.
D) tonofilament.
E) both C and D

F) B) and E)
G) A) and E)

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Focal contact is associated with which of the following cellular junction?


A) tight junctions
B) plasmodesmata
C) adhesive junction
D) gap junction
E) all of the above

F) C) and E)
G) B) and E)

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In which of the following organs would you expect to find adhesive junctions in humans?


A) skin epithelium
B) uterus
C) heart muscle
D) both A and B
E) choices A, B, and C

F) All of the above
G) B) and C)

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Of the proteoglycans associated with the extracellular matrix in vertebrates, which of the following is associated with the lubrication of joints?


A) mucoproteins
B) glucuronate
C) hyaluronate
D) chondroitin sulfate
E) keratan sulfate

F) B) and D)
G) B) and C)

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A patient rushed to the emergency room immediately needs a blood transfusion. The patient is found to have only anti- A antibodies in circulation. The blood type of this individual must be


A) AB.
B) O.
C) A.
D) B.

E) All of the above
F) A) and B)

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The three most common glycosaminoglycans (GAGs)are , , and .

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chondroiti...

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You discover a dog suffering from a strange disorder that has been found to be due to an autoimmune response against its own cells. Upon further investigation, you find that the cells of various tissues are loosely arranged and do not have characteristic shapes, and that the animal is prone to hemorrhage as the result of poor blood clotting. Based on these results, the target of the autoimmune response could be


A) laminins.
B) desmotubules.
C) pectins.
D) fibronectins.
E) extensins.

F) A) and B)
G) A) and C)

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The primary polysaccharides associated with the plant cell wall are the


A) hemicelluloses.
B) fibronectins.
C) extensins.
D) pectins.
E) both A and D

F) A) and E)
G) A) and C)

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