A typical membrane lipid of archaea.

Diphytanyl moieties are 8 five-carbon isoprene groups condensed end-to-end.

TLS Online TPP Program

#Id: 534

#Unit 2. Cellular Organization

An actual overlapping gene occurs when the same sequence of DNA encodes two nonhomologous proteins because it uses more than one reading frame.

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#Id: 535

#Unit 2. Cellular Organization

We use the principle of parsimony in comparing the organization of orthologous genes by assuming that a common feature predates the evolutionary separation of the two species.

TLS Online TPP Program

#Id: 536

#Unit 2. Cellular Organization

Surface area/volume ratio of bacteria is high compared to the same ratio for larger organisms of similar shape.

TLS Online TPP Program

#Id: 537

#Unit 2. Cellular Organization

The shape of a bacterium is governed by its rigid cell wall.

TLS Online TPP Program

#Id: 538

#Unit 2. Cellular Organization

Some bacterial species are pleomorphic. Example: genera Arthrobacter, Corynebacterium, Mycobacterium, Mycoplasma, etc.

TLS Online TPP Program

#Id: 539

#Unit 2. Cellular Organization

Helical bacteria with: 

1. Less than one turn- vibrioid shape

2. Complete turn- helical shape