Bacteria are classified in different ways. The nurse educator is reviewing with a group of nursing students the categories of different bacteria
Bacteria may be classified according to their flagella, shape, motility, Gram stain result, and relationship with oxygen. Based on this information, what would be correct responses by a student nurse about gram-negative stain results?
1 . The cell envelope is a thick layer of murein.
2 . The organism has a purple color.
3 . The cell envelope is a thin layer of murein.
4 . The organism has a light pink color.
A) 1, 2
B) 1, 4
C) 2, 3
D) 3, 4
D
Feedback:
In gram-negative bacteria, the murein layer is thin and is surrounded by an outer membrane. In this case, the stain is not retained and the organism looks light pink. In gram-positive bacteria, the cell envelope is a thick layer of murein and it retains the stain, turning a purple color.
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