Lab 4-Microscopic cell & colony shape Flashcards
Bacterial cell shape should be determined by viewing the slide under the oil immersion (100X)
objective lens. True / False
True
E. coli is a gram negative coccus shaped bacteria.T/F
False, it is rod shape
Staphylo is a term used to describe a bacterial cell shape. T/F
False
Bacillus is a term used to describe a bacterial cell shape. True / False
True
Simple staining procedures are ideal for determining cell shape and colony morphology.
True / False
True
Which of the following descriptions does not correctly apply to M. luteus
The microscopic colony arrangement may appear single, diplo, tetrad or staphylo.
Which of the following organisms possess a bacillus cell morphology? (circle all that apply)
- Escherichia Coli
- Corynebacterium xerosis
- Bacillus subtilis
Which of the following may make it difficult to determine cell shape and colony morphology on
your Gram stained slides?
- Thick, overlapping layers of cells due to an excessively heavy smear of bacterial.
- Distortion of cell shape due to improper heat fixing.
A bacterial cell described as a coccobacillus would have what kind of cell shape?
Short, fat rod
Which of the following is not a bacterial cell shape we learned about in class? (keep in mind we
didn’t view each of these types)
Sarcina
Which of the following is not a microscopic colony arrangement we learned about in lab?
Diplo
Which of the following microscopic colony morphologies do you think you are least likely to ever
encounter?
Staphylobacilli
Why do E.coli cells sometimes appear as cocci on microscope slides?
Because bacilli appear round when viewed from the end
The only Gram negative, rod shaped bacteria you’ve viewed in lab so far is?
Escherichia coli
what are the numerous
small ovoid objects that make interpreting an old B. subtilis culture Gram stain somewhat
difficult
Endospores
