A closer look at the chemical structure of DNA includes the four nitrogenous bases Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). DNA also includes sugars and phosphate groups that make the phosphate-deoxyribose backbone. If you think of the structure of DNA as a twisted ladder, the rungs of the ladder are made from the nitrogenous bases. These bases pair up to make each step of the ladder. They also only pair up in a specific way.
1 Testing fees can add an additional $120-$300 to the applicant's costs. 2  The Praxis Tests cost $50 for registration and an additional $65-$150 for individual tests, several of which may be required by a state.3  Most states require teachers to pass Praxis Tests prior to receiving a teaching license. Licensing fees for teachers are typically $35-$200, and this fee must be paid after passing any required tests and meeting additional licensing requirements. 2  For example, the Connecticut initial education certificate costs $200.
Expected Earnings. In the United States, a private-school elementary Montessori teacher with a bachelor's degree would expect a starting salary for a full-day, nine-month year of $25,000 to $30,000. Primary (preschool) teachers with no previous experience usually start at $21,000-$24,000.Teachers eligible for public-school Montessori teaching (usually requiring state teacher certification in addition to the Montessori diploma) would expect a salary beginning at $29,000-$31,000.Salaries vary from region to region and depend on the background of the teacher.eachers eligible for public-school Montessori teaching (usually requiring state teacher certification in addition to the Montessori diploma) would expect a salary beginning at $29,000-$31,000. Salaries vary from region to region and depend on the background of the teacher.