Using clay, demonstrate how cocci can divide in several planes and show the outcome of this division. Show how the arrangements of bacilli occur, including palisades.
Introduction:
Cocci show a variety of arrangement and can also be categorized on that basis. It is mainly influenced by the pattern of division and how cells remain attached even after that.
Explanation of Solution
Bacterial cells can be classified on the basis of their arrangement, or grouping pattern. A wide variety of arrangements is seen in cocci. This is influenced by the division pattern and the attachment properties of the cell. The cells can appear as single, in pairs (diplococci), in tetrads (groups of four), irregular clusters (staphylococci and micrococci), in chains (streptococci), or in complex cubical packets (sarcina). These arrangements when coccus is divided along single plane, perpendicular planes, or in several intersecting planes.
Bacilli do not exhibit wide variety in arrangement as they divide along the transverse plane. So they can occur as single cell or in pairs with their ends attached (diplobacilli), or as chains of several cells (streptobacilli). Palisade arrangement is displayed only by corynebacterial, eherre the cells remain partially attached by a small hinge region at the end. These cells tend to snap back over each other too form rows of cells arranged side by side.
Hence, on the basis of division pattern, different types of cocci arrangements are obtained and this is used as a criterion to categorize bacterial cells.
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Chapter 4 Solutions
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