Which compound is a saturated hydrocarbon?

Saturated hydrocarbons are organic compounds that contain only single bonds between the carbon atoms. They are known to be the simplest organic compounds. They are termed as such because they are saturated with water. Examples are the alkanes (ethane, methane, propane, butane, etc.).

Enzyme make a hormone as a catalyst

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"