You are performing a Gram stain on gram-positive bacteria and you stop after the addition of the first dye. What is the appearance of the bacteria at this point?
purple
red
colorless
brown
The Correct Answer is A
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Identification: The practical process of recognizing and naming an organism, not the name of the science itself.
B. Classification: The process of grouping organisms based on shared characteristics; it is a component of the broader science.
C. Taxonomy: The scientific study of naming, describing, and classifying organisms -the formal name of the science.
D. Nomenclature: The set of conventions and rules used within taxonomy for assigning names to organisms.
Correct Answer is C
Explanation
A. Endospores: Endospores are resistant survival forms produced by some bacteria (e.g., Bacillus, Clostridium), not a fungal reproductive structure.
B. Cysts: Cysts are dormant/survival forms often seen in protozoa; fungi typically reproduce via spores.
C. Spores: Fungi reproduce and disperse primarily via spores (asexual and sexual types such as conidia, sporangiospores, ascospores, basidiospores).
D. Eggs: Eggs are multicellular reproductive cells of animals; fungi don’t produce eggs as their main reproductive units.
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