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- QUESTION 33 Of the following cell types, which one would be most likely to exist in the G0 state? A. An epithelial cell in the intestine of a developing embryo B. A primary spermatocyte C. An intestinal epithelial cell line growing rapidly in a cell culture dish D. A differentiated intestinal epithelial cell in an adultQUESTION 18 Which of the following are features of the basement membrane but not the ECM? A Contains both laminins and fibrillar collagens (e.g. collagen I and III). B Contains all types of collagens. C Contains both laminin and network-forming collagens (e.g. collagen IV). D Contains network-forming collagens (e.g. collagen IV) E Contains fibrillar collagens (e.g. collagen I and III).QUESTION 6 Which of the following is NOT an example of an intermediate filament? A Neurofilaments in neuronal cells B Keratins in epithelial cells C Nuclear lamins in most cells D Laminin in the basement membrane E Vimentin in fibroblast cells
- Question:- where do each of thse go? which boxQUESTION 16 Which integral membrane protein are responsible for communicating signals from the extracellular matrix and/or basement membrane proteins to the cytoskeleton? A Fibronectin B Adherens junctions C Cadherins D IntegrinsQUESTION 2: Select the correct statement regarding the actin cytoskeleton O They are involved in the formation of the axoneme Actin microfilaments are the most stable rytoskeleton network can undergo catastrophe due to GTP hydrolysis-mediated conformational changes Synthesis and degradation of actin microfiaments is directional with g-actin subunits added only to the end of the microflament while depolymerization occurs at the end. QUESTION 3: From the list below salect the correct statements regarding the genetic code The basis of the genetic code are codons Cosons are formed by 5 consecutive nucleotides The genetic code has a possibile 64 different codem Codos code for 30 distinct amo acas The genetic code has built in degeneracy
- The micrographs of areolar and adipose tissue both show cells (fibroblasts and adipocytes), but the density of cells in the two tissues is very different. What do you think causes this difference?Does skeletal muscle, like cardiac muscle, have gap junctions between adjacent cells? Why or why not?When William H. was helping victims after a devastating earthquake in a region not prepared to swiftly set up adequate temporary shelter, he developed severe diarrhea. He was diagnosed as having cholera, a disease transmitted through unsanitary water supplies contaminated by fecal material from infected indiv iduals. The toxin produced by cholera bacteria causes Cl- channels in the lurninal membranes of the intestinal cells to stay open, thereby increasing the secretion of Cl- from the cells into the intestinal tract lumen. By what mechanisms would Na+ and water be secreted into the lumen in conjunction with Cl- secretion? How does this secretory response account for the severe diarrhea that is characteristic of cholera?
- QUESTION 19 Match the cellular junction with its characteristic (side of cell, cellular role, intracellular connection or transmembrane protein) tight junctions focal adhesions desomsomes gap junctions A. integrins link the actin-myosin stress fibers to the extracellular matrix B. connexons form pores between cells in an epithelial sheet or tube C. link the intermediate filaments of neighboring cells using homophilic cadherin-cadherin binding D. occludins bind to occludins and prohibit the diffusion of membrane proteins from the baso-lateral surface to the apical surface of epithelial cellsQuestion 6 Which of the following statements about graded potentials and action potentials is true? Answers: a. Action potentials are triggered through the passive spread of membrane depolarization. b. Graded potentials can by produced by the net movement of Nat, CI, or K* across the plasma membrane. c. Graded potentials can occur as the result of either hyperpolarization of depolarization of the plasma membrane. d. All of the statements are true. e. The duration of a graded potential is related to the duration of the stimulus.Sheets of tightly bound cells that line internal cavities and cover exposed areas are -------------- tissue. Leaky gut syndrome occurs as a result of openings in this tissue in the digestive tract.