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Q.

Which of the following, relationship between cell structure & its respective functions is incorrect ?
 

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a

Cytoskeleton : Mechanical support
 

b

Lysosomes : Digesting macromolecules 
 

c

Plasma membrane : Selectively permeable to certain molecules present on either side of it
 

d

Genomic DNA  : Motility of bacteria cell 

answer is D.

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Detailed Solution

The cytoskeleton in a cell are involved in many functions such as mechanical support, motility, maintenance of the shape of the cell.

Lysosomes are membrane bound vesicular structures fe very rich in almost all types of hydrolytic enzymes (hydrolases – lipases, proteases, carbohydrases) optimally active at the acidic pH. These enzymes are capable of digesting carbohydrates, proteins, lipids and nucleic acids.

Plasma membrane: One of the most important functions of the plasma membrane is the transport of the molecules across it. The membrane is selectively permeable to some molecules present on either side of it.

In prokaryotes,the genetic material is basically naked, not enveloped by a nuclear membrane. In addition to the genomic DNA (the single chromosome/circular DNA), many bacteria have small circular DNA outside the genomic DNA. These smaller DNA are called plasmids.

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