Bacterial cells are between 0.3 and 5 lm in size. They have three basic forms: cocci, straight rods, and curved or spiral rods (Table 1). The nucleoid consists of a very thin, long, circular DNA molecular double strand that is not surrounded by a membrane. Among the nonessential genetic structures are the plasmids. The cytoplasmic membrane harbors numerous proteins such as permeases, cell wall synthesis enzymes, sensor proteins, secretion system proteins, and, in aerobic bacteria, respiratory chain enzymes.
Bacterial cells are between 0.3 and 5 lm in size. They have three basic forms: cocci, straight rods, and curved or spiral rods (Table 1). The nucleoid consists of a very thin, long, circular DNA molecular double strand that is not surrounded by a membrane. Among the nonessential genetic structures are the plasmids. The cytoplasmic membrane harbors numerous proteins such as permeases, cell wall synthesis enzymes, sensor proteins, secretion system proteins, and, in aerobic bacteria, respiratory chain enzymes.
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