Prokaryotic Cells — NEET Biology MCQs with Solutions
Free NEET Biology Prokaryotic Cells MCQs with step-by-step solutions (6 questions). Part of Cell: The Unit of Life. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Prokaryotic Cells · easy · theory
A defining feature of prokaryotic cells is the absence of a:
A. Ribosomes
B. Membrane-bound nucleus and organelles ✓ Correct
C. Cytoplasm
D. Cell membrane
Solution: Prokaryotes lack a nuclear envelope and membrane-bound organelles; their DNA lies in a nucleoid.
Q2 — Prokaryotic Cells · easy · theory
The ribosomes of prokaryotes are of the ______ type:
A. 60S
B. 70S ✓ Correct
C. 80S
D. 90S
Solution: Prokaryotic ribosomes are 70S (30S + 50S); eukaryotic cytoplasmic ribosomes are 80S.
Q3 — Prokaryotic Cells · medium · theory
Extra-chromosomal, small circular DNA in bacteria that carries genes (e.g. for resistance) is the:
A. Inclusion body
B. Plasmid ✓ Correct
C. Nucleoid
D. Mesosome
Solution: Plasmids replicate independently and often carry antibiotic-resistance genes; they are used as cloning vectors.
Q4 — Prokaryotic Cells · medium · theory
The infolding of the plasma membrane in bacteria that helps in respiration, DNA replication and cell wall formation is the:
A. Mesosome ✓ Correct
B. Lysosome
C. Golgi body
D. Endoplasmic reticulum
Solution: Mesosomes are membrane infoldings (analogous roles to some organelles); prokaryotes lack ER, Golgi, mitochondria.
Q5 — Prokaryotic Cells · hard · theory
The bacterial cell envelope (from outside in) consists of:
A. Only a plasma membrane
B. Cell wall and nuclear membrane
C. Glycocalyx, cell wall, and plasma membrane ✓ Correct
D. Capsule and mitochondria
Solution: The three-layered envelope is glycocalyx (capsule/slime) → cell wall (peptidoglycan) → plasma membrane.
Q6 — Prokaryotic Cells · hard · theory
Gram-positive and Gram-negative bacteria are distinguished on the basis of:
A. Ribosome type
B. Their cell wall structure (response to Gram staining) ✓ Correct
C. The presence of a nucleus
D. The presence of mitochondria
Solution: Gram staining differentiates thick peptidoglycan walls (Gram +) from thin walls with an outer membrane (Gram −).