Cyanobacteria Are Believed to Generate the Majority of Oxygen Gas

question 25

Multiple Choice

Cyanobacteria are believed to generate the majority of oxygen gas in Earth's atmosphere. What allows them to produce oxygen?

• A) Photosynthesis in which H₂S is the electron source
• B) Photosynthesis in which water photolysis produces H⁺, e^- and O₂
• C) Bacteriorhodopsin-based photosynthesis
• D) all of the above
• E) none of the above

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Definitions:

Watson

Refers to James Watson, who, along with Francis Crick, Maurice Wilkins, and Rosalind Franklin, is credited with discovering the double helix structure of DNA.

Crick

Francis Crick, a British molecular biologist, biophysicist, and neuroscientist, known for co-discovering the structure of DNA along with James D. Watson.

Griffith's Transformation

A process discovered by Frederick Griffith in 1928, demonstrating that a substance from dead bacteria could genetically transform living bacteria.

Avery

Refers to Oswald Avery, a bacteriologist who was instrumental in demonstrating that DNA is the substance that causes genetic transformation.