Ultraviolet Radiation

question 49

Multiple Choice

Ultraviolet radiation:

• A)is the same as X rays
• B)is the same as gamma rays
• C)penetrates glass,cloth,paper and most other materials
• D)kills microorganisms by damaging DNA and proteins

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Definitions:

Peptidoglycan

A complex polymer found in the cell walls of bacteria that provides structural support and protection.

Gram-positive

Refers to bacteria that retain the crystal violet dye used in Gram staining, indicating a thick peptidoglycan layer in their cell walls.

Gram-negative

Bacteria characterized by a thin layer of peptidoglycan in their cell wall, covered by an outer membrane containing lipopolysaccharides; stains pink in Gram staining.

Cyanobacteria

Photosynthetic microorganisms, also known as blue-green algae, that are key players in nitrogen fixation and oxygen production in various ecosystems.