Question

MULTIPLE CHOICE QUESTION 1:

Which of the following is true in comparing the protein versus nonprotein components of the extracellular matrix (ECM)?

A. The protein and nonprotein components of the ECM are both extensively negatively charged.

B. The individual protein component molecules and nonprotein component molecules are both branching structures.

C. The nonprotein component of the ECM contains hydroxyl functional groups, whereas the protein components of the ECM do not.

D. The nonprotein component of the ECM is dominated by negative charge, whereas the protein component of the ECM may carry either a net positive, neutral, or negative charge.

MULTIPLE CHOICE QUESTION 2:

Which of the following answers correctly completes this statement? __________ in plant cell walls and __________ in extracellular matrices both/all perform the function of __________.

A. cellulose; proteoglycans; structural molecules

B. extensins and hemicelluloses; fibronectins and laminae; adhesive molecules

C. pectins; fibronectins and laminae; adhesive molecules

D. cellulose; collagens and elastins; cell-cell recognition

MULTIPLE CHOICE QUESTION 3:

In many people, the ingestion of ethanol produces a dose-dependent leakage of interstitial fluid from the intestinal wall into the lumen of the intestine, giving rise to diarrhea. Which of the following proteins is likely inhibited or compromised in function to produce this ethanol-induced diarrhea?

A.plakoglobin

B. claudins

C. connexin

D. cadherins