Which of the following statements about collagen is false? A) The collagen prote

Question

Which of the following statements about collagen is false? A) The collagen proteinase cleaves the termini of pro collagen B) Cells bind collagen directly through cell surface integrin proteins C) Single collagen polypeptide chains are assembled into triple stranded D) Collagen provided tensile strength Which of the following is a function of gap junction A) To adhere cells to one another through cadherin proteins B) To allow the passage of ions between cells C) To prevent the lateral diffusion of proteins and lipids D) To adhere cells to the basal lamina The transmembrane integrin proteins can be found in which of the following types of adhesion junction A) Tight junctions B) Adherens junctions C) Hemidesomosomes D) Desmosomes Which of the following is not true of the basal lamina? A) It is structure upon which epithelial cells rest B) It contains osteoblasts C) Its composed of collagen and laminin D) Epithelial cells attach to it through the Hemidesomosomes

Explanation / Answer

20 B it contains osteoblasts .

Osteoblasts are bone cells present in bony matrix.

19. C Hemidesmosomes

Hemidesmosomes attach cell with matrix through integrins.

18 A

Does not adhere cells to one another through cadherin protein. Cadherin protein is part of adherence junction.

17. A

False statement is: collagen proteinase cleaved the end of procollagen.

This statement is false as procollagen is converted to collagen by addition of hydroxyl residues to certain amino acids.

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