The AP Biology exam has three main sections: molecules and cells, heredity and evolution, and organisms and populations. AP Biology is the most popular Advanced Placement course in the natural sciences. In 2016 over 238,000 students took the exam, and the mean score was 2.85. Most colleges and universities have a science and lab requirement, so a high score on the AP Biology exam will sometimes fulfill this requirement. The distribution of scores for the AP Biology exam is as follows (2016 data): 5 - 6.6%. 4 - 21.0%.
1. vitamin A2 - a viscous alcohol that is less active in mammals than is vitamin A1. dehydroretinol. antiophthalmic factor, axerophthol, vitamin A, A-any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes.. (Biochemistry) a vitamin that occurs in the tissues of freshwater fish and has a function similar to that of vitamin A. Formula: C20H28O.
Vitamin A is a group of unsaturated nutritional organic compounds, that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids, and beta-carotene. Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision.itamin A can be found in two principal forms in foods 1  : Retinol, the form of vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble substance. 2  Since the pure alcohol form is unstable, the vitamin is found in tissues in a form of retinyl ester.