34. The major microtubule-organizing center in most animal cells is the a. kinet
ID: 253559 • Letter: 3
Question
34. The major microtubule-organizing center in most animal cells is the a. kinetochore b. centriole. d. centromere. 35. Kinesins are able to transporta along microtubules. a. membranous vesicles and mitochondria b. endoplasmic c. mRNAsnic reticulumtcodri d. All of the above 36. A male patient at a medical clinic presents with infertility due to nonmotile sperm and an inability to clear mucous from his respiratory tract. Other tissues are normal. You suspect that these symptoms may be caused by mutant a. tubulin. b. kinesin. c. dynein. d. tau protein. 37. The beating of cilia and flagella occurs by means of based a. dynein; microtubule sliding b. kinesin; microtubule sliding c. myosin; microfilament sliding d. tubulin; microtubule contraction 38. Intermediate filaments function in a. cell motility b. providing mechanical strength for cells. c. nuclear pore structure. d. All of the above 39. Which of the following is not an intermediate filament protein? a. Vimentin b. Lamin A c. Desmin 40. Expression of a shortened skin keratin gene in place of the normal keratin gone in transgenic mice results in a phenotype in which mice have a. thick skin. b. no hair C. fragile, easily blistered skin. d. white hair 41. In cells, actin filaments form a network that provides mechanical support, determines cell shape, and allows for movement of the cell surface. a. True b. FalseExplanation / Answer
Hello,
34. c.Centrosome - it serves as the main microtubule organizing center (MTOC) in the animal cells. They are composed of two orthogonally arranged centrioles surrounded by an amorphous mass of protein termed the pericentriolar material (PCM) and are associated with spindle formation.
35. a.Membranous vesicles and mitochondria - kinesins are motor proteins which move along microtubule filaments and this movement involves ATP hydrolysis. It moves from positive end of the microtubule and brings about anterograde transport of membranous vesicles and mitochondria.
36. c.Dynein - dynein is a cytoskeletal motor protein involved in the beating of cilia and flagella. Since movement of sperm and clearance of mucous from respiratory tract involves the proper movement of cilia and flagella dynein must be the mutant protein involved.
37. a.Dynein; microtubule sliding - The normal oscillatory beating of cilia and flagella occurs by dynein-powered sliding movements between the peripheral doublet microtubules of the axoneme.
38. b.Providing mechanical strength for cells - they mainly function to support and maintain the structure of the cells and are closely associated with the plasma membrane.
39.d.Fibronectin - this is not an intermediate filament protein instead it is a high molecular weight glycoprotein present in the extracellular matrix, while the rest of the three proteins are intermediate filament protein/
40.c.fragile, easily blistered skin - keratin is a fibrous structural protein that is involved in maintaining the structure of the cells and protect it from damage and stress. So mutation of this gene would lead to fragile and easily blistered skin.
41.a.True - actin is a globular multi-functional protein which is involved in carrying out all the mentioned fuctions in the statement made,
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.