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Beyond these basic, universal features, eukaryotic genomes vary dramatically in terms of size and gene counts. Even so, genome size and the number of genes present in an organism reveal little about that organism's complexity (Figure 1).ne pg is equivalent to approximately 1 billion base pairs.) Therefore, genome size is clearly not an indicator of the genomic or biological complexity of an organism. Otherwise, humans would have at least as much DNA as the marbled lungfish, although probably much more.
The body of all living organisms (bacteria, blue green algae, plants and animals) except viruses has cellular organization and may contain one or many cells. The organisms with only one cell in their body are called unicellular organism (e.g., bacteria, blue green algae, some algae, protozoa etc).The organisms having many cells in their body are called multicellular organisms (plants and animals).he organisms with only one cell in their body are called unicellular organism (e.g., bacteria, blue green algae, some algae, protozoa etc). The organisms having many cells in their body are called multicellular organisms (plants and animals).