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  2. AP Biology - Wikipedia

    en.wikipedia.org/wiki/AP_Biology

    Advanced Placement (AP) Biology (also known as AP Bio) is an Advanced Placement biology course and exam offered by the College Board in the United States. For the 2012–2013 school year, the College Board unveiled a new curriculum with a greater focus on "scientific practices".

  3. Advanced Placement exams - Wikipedia

    en.wikipedia.org/wiki/Advanced_Placement_exams

    Advanced Placement (AP) examinations are exams offered in United States by the College Board and are taken each May by students. The tests are the culmination of year-long Advanced Placement (AP) courses, which are typically offered at the high school level. AP exams (with few exceptions [1]) have a multiple-choice section and a free-response ...

  4. Advanced Placement - Wikipedia

    en.wikipedia.org/wiki/Advanced_Placement

    On the other hand, a study of University of California system students found that only about 55% to 60% of AP students took their course's exam. [70] One 2014 study of math and science AP courses showed that participation rates were 52.7% for AP Chemistry, 53.6% for AP Physics, 57.7% for AP Biology, and 77.4% for AP Calculus. [71]

  5. Sex-determining region Y protein - Wikipedia

    en.wikipedia.org/wiki/Sex-determining_region_y...

    In humans, the SRY gene is located on short (p) arm of the Y chromosome at position 11.2. Sex-determining region Y protein (SRY), or testis-determining factor (TDF), is a DNA-binding protein (also known as gene-regulatory protein/transcription factor) encoded by the SRY gene that is responsible for the initiation of male sex determination in therian mammals (placentals and marsupials). [5]

  6. Alternative complement pathway - Wikipedia

    en.wikipedia.org/wiki/Alternative_complement_pathway

    The classical and alternative complement pathways. Alternative pathway. (Some labels are in Polish.) The alternative pathway is a type of cascade reaction of the complement system and is a component of the innate immune system, a natural defense against infections.

  7. College Board - Wikipedia

    en.wikipedia.org/wiki/College_Board

    The SAT Reasoning Test with essay cost $64.50 [50] ($93.50 if late) as of 2019, the AP exams cost US$97 ($137 if late) as of 2023, and taking AP exams is often a requirement for students taking AP classes. [51]

  8. Morphology (biology) - Wikipedia

    en.wikipedia.org/wiki/Morphology_(biology)

    Morphology of a male skeleton shrimp, Caprella mutica Morphology in biology is the study of the form and structure of organisms and their specific structural features. [1]This includes aspects of the outward appearance (shape, structure, color, pattern, size), i.e. external morphology (or eidonomy), as well as the form and structure of internal parts like bones and organs, i.e. internal ...

  9. Iron in biology - Wikipedia

    en.wikipedia.org/wiki/Iron_in_biology

    Iron is required for life. [1] [2] [3] The iron–sulfur clusters are pervasive and include nitrogenase, the enzymes responsible for biological nitrogen fixation.Iron-containing proteins participate in transport, storage and use of oxygen. [1]

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