The following ___ is a structure unique to prokaryotic cells（）
A. Mitochondria
B. Nuclear
C. Intermediate
D. Cell membrane
E. Spore
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The common forms of bacterial cells are ____（）
A. Spherical
B. Ring
C. Spiral
D. Rod shape
E. Cylindrical
The characteristic structure of the gram-negative cell wall includes ____（）
A. Peptidoglycan
B. Teichoic acid
C. Outer layer
D. Lipopolysaccharide
E. Inner wall layer
Pasteur uses the retort test to（）
A. Refute the spontaneous generation theory
B. Prove that microorganisms can cause disease
C. Analyze the chemical structure of microorganisms
D. Purify the metabolites of microorganisms
The key step of Gram staining is ____（）
A. Crystal Violet First Stain
B. Iodine Mordant
C. Alcohol decolorization
D. Saffron counterstain
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