The right answer is a raised, circular colony.
In biology, a colony (from Latin colonia) is a group of individual organisms belonging to the same living species grouped together in a particular way of life.
The appearance of the colonies is the primary character used to guide the diagnosis made by the bacteriologist.
The shape of the colonies depends on:
A) intrinsic factors to the bacteria:
- mobility
- morphology: size, shape, contour, relief, surface
- production of a capsule
- production of extracellular material
- pigmentation
- presence of fimbriae
B) extrinsic factors:
- Gradients of solutes created around the colony
- presence of dyes in the culture medium
