NEET (NTA)-National Eligibility cum Entrance Test (Medical) Biology Diversity in Living World-Five Kingdom Classification Revision (Page 2 of 46)

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Structure of Eubacteria

Bacterial cell have a chemically complex cell envelope. The cell envelope consists of a tightly bound three layered structure.

  1. Outermost glycocalyx (may be capsule or slime layer)

  2. Cell wall

  3. Cell membrane

Although each layer of the envelope performs distinct function they act together as a single protective unit.

1. Capsule or Glycocalyx or Slime layer -

  • When bacteria are surrounded by capsule, called as capsulated bacteria. Formation of capsule is done by cell membrane. Caps

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Cytoplasmic organelles

1. Mesosomes -

  • Mesosome was discovered by F. James. The cell membrane of bacteria invaginates (extensions) in cytoplasm at different places and form mesosomes or chondrioid. These extensions are in the form of vesicles, tubules and lamellae.
  • These are functionally mitochondria like structures. Oxidative enzymes are found in mesosomes. On the basis of position and function mesosomes are of two types;
  1. Peripheral mesosome - They are situated near the cell mem. In peripheral part and

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