2. (8 points) Below are metabolic data measured on 4 blood samples (A, B, C, D). Two of these samples were collected from a cow one from the portal vein and one from the aorta (as a sample of peripheral blood). The other two blood samples were collected from a pig, also the portal vein and aorta. Identify each of the four and how do you know it is from the pig or the cow and the portal vein an aorta? A. B. C. D
Acetate (mm) 105 15 105 15
Propionate (mm) 12 10 65 12
Glucose (mg/dl) 40 135 5 90

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