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

---

Definitions:

Internal Control System

A process implemented by management and other personnel to provide reasonable assurance regarding the achievement of objectives in effectiveness and efficiency of operations, reliability of financial reporting, and compliance with laws and regulations.

Purpose

The reason for which something is done or created, or for which something exists.

Voucher System

An accounting system that involves preparing and approving vouchers before transactions are recorded and payments made, to ensure financial controls.

Control Procedures

Measures and policies implemented by a company to ensure the integrity of financial and accounting information and compliance with laws and regulations.