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Standard XII
Biology
Prokaryotic Cell
Question

Prokaryotes are characterized by
  1. Absence of internal compartmentalisation
  2. Absence of nucleus
  3. All the above
  4. 70S ribosome

A
Absence of internal compartmentalisation
B
All the above
C
70S ribosome
D
Absence of nucleus
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Solution
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The correct option is D All the above
Prokaryotes are unicellular organisms that lack membrane-bound organelles. They also lack true nucleus. They have nucleoid, genetic material without nuclear envelope. They posses ribosomes in the cytoplasm. They are also characterized by absence of internal compartmentalisation. All prokaryotes have 70S ribosomes. The 70S ribosome is made up of a 50S and 30S subunits. Examples of prokaryotes include bacteria, cyanobacteria.
Thus, the correct answer is 'All the above.'

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Q1
Prokaryotic ribosomes are 70S. Here 'S' refers to:
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Q2
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Q5
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