Large areas of opposing plasmalemma may be interconnected by transmembrane prote

Question

Large areas of opposing plasmalemma may be interconnected by transmembrane proteins called which bind to each other and to other extracellular materials. A) cytokeratins B) hemidesmosomes C) connexons D) cell adhesion molecules (CAMs) E) nexuses 61) Hemidesmosomes are found___. A) in epithelial tissue that is undergoing wound repair B) in epithelial tissues subjected to a significant amount of abrasion and shearing forces C) among epithelial cells where they help coordinate functions such as the beating of cilia D) in abundance in cardiac muscle and smooth muscle E) in epithelial tissues where they are essential to the coordination of muscle cell contractions

Explanation / Answer

60) Large areas if opposing plasmalemma are interconnected by transmembrane proteins called as cell adhesion molecules (CAMs). CAMs bind to each other and with the extracellular matrix. CAMs consists of three domains. Intracellular domain which interacts with cytokeratin, transmembrane domain and extracellular domain where it interacts with other CAMs or extracellular matrix. Therefore, the correct answer for this question is option D.

61) Hemidesmisomes are found in epithelial tissues that are subjected to a significant amount of abrasion and shearing forces. They require strong attachment to the basal lamina. They are found in cornea, mucosal surfaces of oral cavity, oesophagus and vagina.

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