Question
Biology Question on Cell: the unit of life
Which of the followings is always ABSENT in prokaryotic cells ?
A
Ribosome
B
Mitochondria
C
DNA
D
Cell wall
Answer
Mitochondria
Explanation
Solution
Prokaryotes have cell wall present outside the cytoplasmic membrane to provide rigidity and shape to the body. Free and fixed ribosomes synthesise proteins. The nuclear material lies freely in the form of irregular single molecule of double stranded DNA. Cell organelles like mitochondria, ER etc., are entirely absent in a prokaryotic cell.