Question

Which of the following pair lack the unit membrane:-

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

Answer 1

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'.