Any person who fulfills the minimum educational requirements prescribed by this article and by the board, who is not less than twenty-one years of age, who desires to obtain a license to practice chiropractic in this state, and who is not entitled to a license therefor under other provisions of this article may make application for such license upon such forms and in such manner as prescribed by the board, which application shall be accompanied by an examination fee. The board may refuse to examine or license an applicant if the applicant has committed any act that would be grounds for disciplinary action against a licensed chiropractor. Such applicant shall be examined by the board or the board's designee in the subjects outlined in section 12-33-111 to determine the applicant's qualifications to practice chiropractic. A license shall be granted to all applicants who on such examination are found qualified by attaining a passing grade on the examinations adopted by the board. Qualification in that portion of the examination relating to the basic sciences shall be established by the applicant submitting proof satisfactory to the board of successfully passing the examination in the basic sciences given by the national board of chiropractic examiners. The board may adopt the practical examination developed and administered by the national board of chiropractic examiners as the practical portion of the examination. If the board adopts such practical examination developed and administered by the national board of chiropractic examiners, qualification in the practical portion of the examination shall be established by the applicant submitting proof satisfactory to the board of successfully passing the practical examination given by the national board of chiropractic examiners, and the passing score for such practical examination shall be as set by the national board of chiropractic examiners. Any chiropractic applicant who desires to practice electrotherapy shall present evidence that he or she has successfully completed a course of not less than one hundred twenty classroom hours in this subject at a school approved by the board or under the instruction of an approved provider.