Types of Microorganisms. 1. Bacteria. Bacteria are unicellular organisms, about few microns in size (1 micron (Âµm) = 1/1,000 of a millimetre), consisting of DNA, cytoplasm, structures needed for metabolism and reproduction, cell membrane, cell wall and capsule (Picture 1). Certain bacteria use flagella, tail-like appendages, to propel themselves.
All U.S. savings bonds have a final maturity date when they stop earning interest. Investors often lose track of this date because the U.S. Treasury Department has extended the original maturity of some bonds up to 30 years.
1 Bonds issued from May 1995 to May 2003 have a term of 17 years. 2  Bonds issued since June 2003 have a term of 20 years.  Series EE bonds are designed as long term investments. They earn interest for a maximum period of 30 years after they are issued. Thus, a Series EE bond with a 20 year term will continue earning interest for 10 years after it matures.