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  2. List of unsolved problems in biology - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Developmental psychobiology posed this question since the lack of knowledge about the precise coordination of all cells, even those not related anatomically, in space and time during the embryonic period does not allow us to understand what forces at the cellular level coordinate four very general classes of tissue deformation, namely: tissue ...

  3. AP Biology - Wikipedia

    en.wikipedia.org/wiki/AP_Biology

    This course is designed for students who wish to pursue an interest in the life sciences. The College Board recommends successful completion of high school biology and high school chemistry [2] before commencing AP Biology, although the actual prerequisites vary from school to school and from state to state.

  4. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Also in 2016, Quizlet launched "Quizlet Live", a real-time online matching game where teams compete to answer all 12 questions correctly without an incorrect answer along the way. [15] In 2017, Quizlet created a premium offering called "Quizlet Go" (later renamed "Quizlet Plus"), with additional features available for paid subscribers.

  5. Cell fate determination - Wikipedia

    en.wikipedia.org/wiki/Cell_fate_determination

    During embryogenesis, for a number of cell cleavages (the specific number depends on the type of organism) all the cells of an embryo will be morphologically and developmentally equivalent. This means, each cell has the same development potential and all cells are essentially interchangeable, thus establishing an equivalence group. The ...

  6. Advanced Placement exams - Wikipedia

    en.wikipedia.org/wiki/Advanced_Placement_exams

    AP exams (with few exceptions [1]) have a multiple-choice section and a free-response section. AP Studio Art requires students to submit a portfolio for review. AP Computer Science Principles requires students to complete the Create task, which is part of the AP grade for the class. AP exams were taken by subject in 2013.

  7. AP Comparative Government and Politics - Wikipedia

    en.wikipedia.org/wiki/AP_Comparative_Government...

    55 multiple choice questions in 60 minutes 50% of score Each question will have 4 options. There will be 2 text-based sources, each one accompanied by 2–2 questions. There will be 3 quantitative sources, each one accompanied by 2–2 questions. 4 free response questions in 90 minutes 50% of score 1 conceptual analysis question

  8. No-observed-adverse-effect level - Wikipedia

    en.wikipedia.org/wiki/No-observed-adverse-effect...

    The United States Environmental Protection Agency defines NOAEL as 'an exposure level at which there are no statistically or biologically significant increases in the frequency or severity of adverse effects between the exposed population and its appropriate control; some effects may be produced at this level, but they are not considered as adverse, or as precursors to adverse effects. [5]

  9. Embryonic sac - Wikipedia

    en.wikipedia.org/wiki/Embryonic_sac

    In Arabidopsis, actin-related proteins regulate female meiosis by modulating the expression of meiotic genes in the megaspore mother cell. [3] One of the key genes whose expression is regulated is Dmc1, a gene that plays a central role in the strand-exchange reactions of meiotic recombinational repair.