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Chapter 3A
prokaryotic cell anatomy and external structures
5
Microbiology
10/21/2011

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Term
What are the 3 basic shapes of prokaryotic cells?
Definition
Cocci (coccus, singular) - spherical or round
Bacilli (bacillus, singular) - rod shaped
Spiral - curved or twisted
Term
Most prokaryotic cells are between __ to ___ um in diameter and ___ to ___ um in length.
Definition
.2 to .3 um
.5 to 10 um
Term
Individual coccus cells can be ____, _____ or ____ shaped.
Definition
round
ellipsoid
bean
Term
If cocci divide in a single plane, they can form single cells, pairs, or chains called _____.
Definition
streptococci
Term
If cocci divide in ___ planes, they appear at tetrads. If they divide in 3 perpendicular planes, they appear as groups of ____. If they divide randomly in any plane, they appear as grape-like bunches called ____.
Definition
two
eight
staphylococci