In Gram Staining, Crystal Violet (A Violet Dye) Is Used

question 27

Short Answer

In Gram staining, crystal violet (a violet dye) is used to specifically stain Gram-positive bacteria. After performing Gram staining on a bacterial sample taken from an infected animal tissue, you observe the results with a microscope. You find two major types of bacteria in the sample, as shown in the schematic drawing below. According to these results, indicate whether each of the following statements is correct (C) or incorrect (I). Your answer would be a three-letter string composed of letters C and I only, e.g. CCC.

( ) The Gram-positive bacteria in this sample are bacilli.
( ) Crystal violet stains lipopolysaccharide (LPS).
( ) The bacteria stained violet in this sample have a thicker layer of peptidoglycan compared to the other bacteria.

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Definitions:

Sensitivity

The quality of being quick to detect or respond to slight changes, signals, or influences.

Physiological Needs

The basic human requirements, such as food, water, and sleep, as identified in Maslow's Hierarchy of Needs.

Maslow's Hierarchy

A theory in psychology proposed by Abraham Maslow that depicts a five-tier model of human needs, arranged in a hierarchy from basic (physiological) needs to higher-level (self-actualization) needs.

Starting Point

the initial position, condition, or phase from which movement, development, or evaluation begins.