The top 20 highest-paid biopharma CEOs 1. Len Schleifer, Regeneron $41.97 million. Schleifer may have popped up on our CEO pay list just a few years ago--and stayed at or near the top--but he's been plugging away at Regeneron since he founded the company in 1988.
Most bacterial species contain a single type of chromosome, but it may be present in multiple copies. Several thousand different genes are interspersed throughout the chromosome; structural gene sequences (encoding proteins) account for the majority of bacterial DNA; nontranscribed DNA sequences between adjacent genes are termed intergenic regions.
The cell division process is controlled by the cell cycle; the chromosomes within the Archaea are replicated to produce two daughter chromosomes. Archaea typically have a single circular chromosome. The two daughter chromosomes are then separated and the cell divides. This process in Archaea appears to be similar to both bacterial and eukaryotic systems. The circular chromosomes contain multiple origins of replication, using DNA polymerases that resemble eukaryotic enzymes.