Which of the following structures is NOT found in external structure of prokaryotic cells?
flagella
axial filaments
pilli
cilium
The Correct Answer is D
A. flagella: Long, whip-like external appendages used for motility in many prokaryotes.
B. axial filaments: Found in spirochetes as endoflagella that run lengthwise beneath the outer sheath and enable corkscrew motility.
C. pilli: Hairlike external structures (commonly spelled pili) used for attachment and conjugation.
D. cilium: Hairlike motility structures built from microtubules (9+2) found on eukaryotic cells and not present in prokaryotes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. purple: Crystal violet is the primary dye; gram-positive cells retain it and appear purple after the first dye.
B. red: Red (safranin) is the counterstain applied later and is not the appearance after the first dye.
C. colorless: Cells become colorless only after decolorization if they do not retain the primary dye (typical of gram-negative), not after the first dye in gram-positive.
D. brown: Brown is not a standard color outcome in the Gram staining sequence.
Correct Answer is A
Explanation
A. ATP: Adenosine triphosphate is the primary cellular energy carrier; energy is stored in its high-energy phosphate bonds.
B. ADP: Adenosine diphosphate contains less stored energy than ATP and is a product of ATP hydrolysis.
C. ATP and ADP: Both are present in cells, but ATP is the principal form in which usable chemical energy is stored.
D. ATP or ADP: Energy is principally stored as ATP rather than ADP.
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