Cell biology Plz do as much as you can Cell biology Plz do as much as you can Pl
ID: 272907 • Letter: C
Question
Cell biology Plz do as much as you can Cell biology Plz do as much as you can Plz do as much as you can o., Actin branching is mediated A. M B. Kinesin D. Arp2/3 complex 50. A small GTPase that mediates actirn A. Ran C. Rab D. Rho E. Ras 5 1 . In epithelia, desmosomes are connected to A. Intermediate filaments B. Actin C. Microtubules D. The endoplasmic reticulum E. The nuclear envelope inside the cell 52. The levels of different change during the cell cycle to control events specific to that sage of the cydle B. Kinetochores C. Cyclins D. Integrins 53. The adhesion molecule family that mediates cell to extracellular matrix adhesion is the A. Integrins B. Cadherins C. 1g Superfamily CAMs D. Receptor tyrosine kinases E. GPCRs small molecules cannot travel between the cells of the epithelium to get from one side of t 54. Because of A. Desmosomes B. Adherens junctions C. Gap junctions D. Tight junctions E. None of the above A. Glycosaminoglycans B. Proteoglycans C. Glycoproteins D. All of the above E. None of the above 55. The extracellular matrix is composed ofExplanation / Answer
49. Actin branching is mediated by
ANSWER IS: D. Arp2/3 complex
EXPLANATION :
Actin filament elongation and branching is mediated by Arp2/3 complex
Arp2/3 complex is 7-subunit protein complex that helps in the regulation of the actin cytoskeleton.
50. Small GTPase that mediate actin filament dynamics is
ANSWER IS: D. Rho
EXPLANATION:
Small Rho GTPase-mediate actin dynamics at endothelial adherens
51. In epithelia desmosomes are connected ____ inside the cell
ANSWER IS:
B. Intermediate filaments
EXPLANATION:
The intermediate filaments extend from desmosomes on one side of the cell to cytosol of desmosomes on the opposite side of the cell. This structural arrangement helps in stability of the cells and tissue.
52. The levels of different____ change during the cell cycle to control events specific to that stage of cycle
ANSWER IS:
C. Cyclins
EXPLANATION:
Every stage of the cell cycle is controlled by the activity of cyclins and cyclin dependent kinases (Cdks).
53. The adhesion molecule family that mediates cell to extracellular matrix adhesion is
ANSWER IS: A. Integrins
EXPLANATION :
Cell adhesion molecules located on the cell surface that helps in binding with other cells or with the extracellular matrix (ECM)
The main class of CAMs that mediate cell- matrix adhesion is the integrins.
54. Because of ___ small molecules cannot travel between the cells of epithelium to from one the other
ANSWER IS: D. Tight junctions
EXPLANATION:
Tight junctions between epithelial cells are sealed junctions so that the transport of molecules cannot occur.
55. The extracellular matrix is composed of
ANSWER IS:
D. All of the above
EXPLANATION:
The extracellular matrix composed of proteoglycans, water, minerals, and fibrous proteins. A proteoglycan consists of glycosaminoglycans.
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