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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.
Here is an illustration of an animal and a plant cell. Some microorganisms are made up of only one cell, whiles other bigger organisms such as an ant or a lion are made up of millions of different cells.Unicellular organism: An organism with only one cell is called a unicellular organism.Unicellular organisms can be complex too, even though they are simply a one-cell organism. They include bacteria, yeast, amoeba and paramecia. Multicellular organism: These are organisms that are made up of more than one cell.ere is an illustration of an animal and a plant cell. Some microorganisms are made up of only one cell, whiles other bigger organisms such as an ant or a lion are made up of millions of different cells.