Bacterial Identification Worksheet
A Grade 12 Science worksheet focusing on bacterial identification techniques, including Gram staining and biochemical tests.
Includes
Standards
Topics
Bacterial Identification
Name:
Date:
Score:
Read each question carefully and provide concise, accurate answers based on your knowledge of bacterial identification techniques.
1. Which component of the bacterial cell wall is primarily responsible for the differential staining in the Gram stain procedure?
Lipopolysaccharide
Peptidoglycan
Teichoic acid
Outer membrane
2. A bacterial species that appears purple after Gram staining is classified as:
Gram-negative
Gram-positive
Acid-fast
Spirochete
3. The primary stain used in the Gram staining procedure is .
4. The decolorizer in Gram staining, typically , removes the primary stain from Gram-negative cells.
5. Bacterial identification often involves a series of tests to determine metabolic characteristics.
6. Briefly explain the principle behind the Gram stain's ability to differentiate between Gram-positive and Gram-negative bacteria.
7. Describe two common biochemical tests used in bacterial identification and what they reveal about the bacteria.
8. Label the following parts of the bacterial cell:
A.
B.
C.
D.
9. Endospores are a primary means of bacterial reproduction.
True
False
10. The catalase test detects the presence of the enzyme catalase, which breaks down hydrogen peroxide.
True
False
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