Consider the following processes
(i) Breakdown of extra-cellular materials by releasing enzymes into the surrounding medium.
(ii) Providing nourishment during starvation.
(iii) Help during remodeling of the bone.
(iv) The massive production of membrane glycoproteins, ribophorins-I, and II for the stabilization of lysosomal investment.
Which of the given is/are functions of lysosomes?

(i) only

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(i), (ii) and (iv)

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(i), (ii) and (iii)

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(ii), (iii) and (iv)

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Solution

The correct option is B (i) only
The interactions between extracellular fibronectin fibrils and intracellular actin filaments across the fibroblast plasma membrane are mediated mainly by integrin transmembrane adhesion proteins. The contractile actin and myosin cytoskeleton thereby pulls on the fibronectin matrix to generate tension.
So, the correct option is ' (i) only'.

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