If you analyze the human genome and come across a 4000 nucleotide long sequence that is found at 5000 different places in the genome, you can conclude that this sequence is a

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.