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.
1 Most archaea have a single circular molecule of DNA, and several origins of replication along this circular chromosome. 2  Eukaryotes often have multiple origins of replication on each linear chromosome that initiate at different times (replication timing), with up to 100,000 present in a single human cell.any bacteria, including E. coli, contain plasmids that each contain an origin of replication. These are separate from the origins of replication that are used by the bacteria to copy their genome and often function very differently.