Question

What line of evidence would support your hypothesis that the organism is a cyanobacterium?

A. It lacks cell walls.
B. It forms chains called mycelia.
C. It is an endosymbiont.
D. It is able to form colonies and produce oxygen.

Answer 1

Answer:

D. It is able to form colonies and produce oxygen.

Explanation:

Cyanobacteria are the photoautotrophs and carry out oxygenic photosynthesis. These prokaryotic organisms use water molecules as an electron donor during light-dependent reactions of photosynthesis and release oxygen gas as a by-product.

Cyanobacteria are considered to be the first organisms on the earth to perform oxygenic photosynthesis and are supposed to be responsible for the present-day oxidative atmosphere of the earth. Most of the cyanobacteria are colonial forms and are present as colonies of a large number of cells. However, unicellular solitary forms are also present.