Bacterial Morphology Virtual Lab Questions PDF

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Bacterial Morphology Lab answer sheet...

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Bacterial Morphology Virtual Lab Answer Sheet Post lab questions 1. Define the following terms: Morphology – the study of the forms of organisms, individually and sometimes in discrete groups. Colony – larger aggregates of many thousands of bacterial cells formed on solid growth medium, which become visible to the unaided eye. 2. What is the relationship between the terms that you defined in question 1? Colonies of bacteria can be described by three morphologies, form, elevation, and margin. 3. Identify the following bacterial shapes and arrangements: Photomicrograph

Bacterial Shape

Cellular Arrangement

Bacillus - rod

Diplobacillus

Coccus -

Staphylococcus

Coccus

Sarcinae

Bacillus – rod

Streptobacillus

4. Which one of the three major bacterial cell shapes is NOT shown in question 3? Spiral is the cell shape that is not shown in question 3.

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2 5. List and define the three morphological characteristics commonly used to describe colonies. Form – the overall shape of the colony which can be circular, irregular, rhizoid, filamentous, or punctiform. Elevation – the shape of the colony when viewed from the side, at the level of the growth surface which can be convex, flat, raised, crateriform, pulvinate, or umbonate. Margin – the edge of the colony which can be filiform, lobate, entire, curled, undulate, or erose.

6. Which of the following terms would NOT be used to describe a colony’s margin? (Choose one or more.) What aspect(s) of colony morphology would this term/these terms be used to describe? Erose Umbonate – used to describe elevation of the colony. Curled Pulvinate – used to describe elevation of a colony. Lobate Entire Filiform Undulate Rhizoid – used to describe form of a colony.

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