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Question

Which of the following pair lack the unit membrane:-


A
Nucleus & E. R.
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B
Mitochondria & chloroplast
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C
Ribosome & nucleolus
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D
Golgi body & Lysosome
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Solution

The correct option is C Ribosome & nucleolus
  • Nucleus has the outer nuclear membrane which is attached to the rough endoplasmic reticulum. This membrane is towards the outer side of the cell while the endoplasmic reticulum has a double-layered plasma membrane.
  • Mitochondria and chloroplasts have double membranes which help to protect their respective DNA.
  • The Golgi body and Lysosome has enzymes for digestion of proteins, lipids etc in the unit membrane.
  • Ribosomes lack the unit membrane. They are present individually in the cell cytoplasm and make the lining of the rough endoplasmic reticulum.
  • Nucleolus lacks a unit membrane. They have genetic materials in the nucleus which consists of RAN, DNA, proteins etc.
So, the correct option is 'Ribosome and nucleolus'.

Biology

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