Cell signaling can be classified to be mechanical and biochemical based on the type of the signal. 1  Mechanical signals are the forces exerted on the cell and the forces produced by the cell. These forces can both be sensed and responded by the cells. Biochemical signals are the biochemical molecules such as proteins, lipids, ions and gases.
1 You must be an American citizen at least 18 years of age (or 21 years in some states). 2  You must be able to pass a drug test and in some cases, a physical endurance exam. 3  Bailiffs are expected to have clean criminal records and be model citizens [source: CV Tips ].
Probation officers usually need to have a bachelor's degree. The most common degree is criminal justice, but related degrees such as social work, psychology, political science and sociology are also good choices. There may also be employers who want master's degrees from applicants who have no related work experience.robation officers should also have good interpersonal skills in order to work with offenders well. A probation officer also needs to be able to learn and keep up with changes in laws and regulations affecting probation and parole.