Question

Which of the following statements regarding cyanobacteria is FALSE?

a) Once they oxygenated the atmosphere, cyanobacteria created conditions that were toxic to their own growth, and are now very rare.
b) While their common name is "blue-green algae", they are a member of domain Bacteria.
c) Cyanobacteria gave rise to the chloroplasts found in photosynthetic eukaryotes
d) They produce oxygen through photosynthesis Photosynthesis most likely first arose in the cyanobacteria

Answer 1

The answer to this is A because they wouldn’t create conditions that are toxic to their own growth, and they aren’t rare.

Answer 2

The false statement regarding cyanobacteria is - a) Once they oxygenated the atmosphere, cyanobacteria created conditions that were toxic to their own growth, and are now very rare.

Cyanobacteria are a phylum of Gram-negative bacteria that obtain energy via photosynthesis

• Endosymbiosis, an ancestral prokaryote engulfed a photosynthetic cyanobacterium that evolved into modern-day chloroplasts.
• Molecular and morphological evidence suggests that are derived from a secondary endosymbiotic event.
• These are called blue-green algae, however, they belong to the prokaryotic domain Bacteria.

The false statement regarding cyanobacteria is - a) Once they oxygenated the atmosphere, cyanobacteria created conditions that were toxic to their own growth, and are now very rare.