Which of the following is a function of gap junctions? A) to adhere cells to one

Question

Which of the following is a function of gap junctions? 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 laminas Loss of intermediate filaments will result in which of the following? A) Progeria B) Weakening of the axons of neurons C) Epidermolysis bullosa D) All of the above The transmembrane integrin proteins can be found in which of the following types of A) tight junctions B) adherents junctions C) hemi desmosomes D) desmosomes Which of the following is not true of the basal lamina? A) It is the structure upon which cells rest B) It contains osteoclasts C) Its composed of collagen and lamina D) Epithelial cells attach to it through the hemidesomosomes The consists of a network of cross-linked actin filaments The Arp 2/3 complex promotes actin nucleation Actin-myosin contraction is dependent on ATP hydroly

Explanation / Answer

17.B  directly connect the cytoplasm of two cells, which allows various molecules, ions and electrical impulses to directly pass through a regulated gate between cells.

18.C loss of function mutations can be more or less severe, depending on the position in the epidermis of the involved keratin.

19.A Tight junctions contribute to the paracellular barrier, the fence dividing plasma membranes, and signal transduction, acting as a multifunctional complex in vertebrate epithelial and endothelial cells

20.B

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