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Question

In cyanobacteria, the membranous extensions into the cytoplasm containing pigments are known as _________. 
  1. chromatophores 
  2. slime layers
  3. mesosomes
  4. capsules


Solution

The correct option is A chromatophores 
Chromatophores are the membranous extensions into the cytoplasm which contain pigments in some prokaryotes like cyanobacteria. 

Mesosomes are also a special membranous structures which is formed by the extensions of plasma membrane into the cell. They do not have pigments but are believed to help in respiration. 

Slime layers and capsules are the part of glycocalyx (the outermost envelope of prokaryotic cells). If the glycocalyx is made up of a loose sheath, then it is called the slime layer. And if it thick and tough then, it is known as the capsule. 

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