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  2. AP Biology - Wikipedia

    en.wikipedia.org/wiki/AP_Biology

    Russian Language and Culture (discontinued 2010) v. t. e. 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. Protein secondary structure - Wikipedia

    en.wikipedia.org/wiki/Protein_secondary_structure

    Protein secondary structure is the local spatial conformation of the polypeptide backbone excluding the side chains. [ 1] The two most common secondary structural elements are alpha helices and beta sheets, though beta turns and omega loops occur as well. Secondary structure elements typically spontaneously form as an intermediate before the ...

  4. Biotic index - Wikipedia

    en.wikipedia.org/wiki/Biotic_index

    From Wikipedia, the free encyclopedia. A biotic indexis a scale for showing the quality of an environmentby indicating the types and abundances of organismspresent in a representative sample of the environment. It is often used to assess the quality of waterin marine and freshwater ecosystems. Numerous biotic indices have been created to ...

  5. Beta sheet - Wikipedia

    en.wikipedia.org/wiki/Beta_sheet

    The beta sheet ( β-sheet, also β-pleated sheet) is a common motif of the regular protein secondary structure. Beta sheets consist of beta strands ( β-strands) connected laterally by at least two or three backbone hydrogen bonds, forming a generally twisted, pleated sheet. A β-strand is a stretch of polypeptide chain typically 3 to 10 amino ...

  6. AOL Mail

    mail.aol.com

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  7. Arithmetic progression - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_progression

    Arithmetic progression. An arithmetic progression or arithmetic sequence (AP) is a sequence of numbers such that the difference from any succeeding term to its preceding term remains constant throughout the sequence. The constant difference is called common difference of that arithmetic progression. For instance, the sequence 5, 7, 9, 11, 13 ...

  8. Advanced Placement - Wikipedia

    en.wikipedia.org/wiki/Advanced_Placement

    Advanced Placement ( AP) [ 4] is a program in the United States and Canada created by the College Board. AP offers undergraduate university-level curricula and examinations to high school students. Colleges and universities in the US and elsewhere may grant placement and course credit to students who obtain qualifying scores on the examinations.

  9. Apatite - Wikipedia

    en.wikipedia.org/wiki/Apatite

    Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ion, respectively, in the crystal.

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