Prokaryotic cell and its envelopes — practice questions

Question 1 · difficulty L1 · recall

What is the DNA-containing region of a typical prokaryotic cell called?

• A. Nucleolus
• B. Nucleoid
• C. Centrosome
• D. Vacuole

Question 2 · difficulty L2 · understanding

What is the usual order of the bacterial cell envelope from outside to inside?

• A. Cell wall, glycocalyx, plasma membrane
• B. Glycocalyx, cell wall, plasma membrane
• C. Plasma membrane, cell wall, glycocalyx
• D. Glycocalyx, plasma membrane, cell wall

Question 3 · difficulty L2 · understanding

A specialised membranous structure in a prokaryotic cell which helps in cell well wall formation, DNA replication and respiration is

• A. Cristae
• B. Endoplasmic Reticulum
• C. Mesosome
• D. Chromatophores

Question 4 · difficulty L3 · application

A bacterium retains its shape after loss of the external slime layer but bursts in a strongly hypotonic medium after its rigid layer is removed. Which structure was removed in the second treatment?

• A. Cell wall
• B. Glycocalyx
• C. Plasma membrane
• D. Flagellum

Question 5 · difficulty L3 · application

A prokaryotic cell has numerous small circular DNA molecules in addition to its main chromosome. What are these extra DNA molecules called?

• A. Plasmids
• B. Nucleosomes
• C. Centrioles
• D. Cristae

Question 6 · difficulty L3 · understanding

Mesosome in a cell is a :

• A. Membrane bound vesicular structure
• B. Chain of many ribosomes attached to a single mRNA
• C. Special structure formed by extension of plasma membrane
• D. Medium sized chromosome

Question 7 · difficulty L3 · understanding

Given below are two statements : Statement I :- In bacteria, the mesosomes are formed by the extensions of plasma membrane. Statement II :- The mesosomes, in bacteria, help in DNA replication and cell wall formation. In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Statement I is correct but Statement II is incorrect.
• B. Statement I is incorrect but Statement II is correct.
• C. Both Statement I and Statement II are correct.
• D. Both Statement I and Statement II are incorrect.

Question 8 · difficulty L4 · analysis

Cell X has a nucleoid, 70S ribosomes and no membrane-bound organelles. Cell Y has a nucleus, mitochondria and 80S cytoplasmic ribosomes. Which interpretation is correct?

• A. X is prokaryotic and Y is eukaryotic
• B. Both are prokaryotic
• C. X is eukaryotic and Y is prokaryotic
• D. Both are eukaryotic