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  2. AP Precalculus - Wikipedia

    en.wikipedia.org/wiki/AP_Precalculus

    The exam is composed of 2 sections, each with 2 different types of questions. Section I consists of 40 multiple choice questions. 28 do not allow the use of a calculator, while the last 12 do allow a calculator. The non-calculator section is worth 43.75% of the exam score, while the calculator section is worth 18.75%. [5]

  3. 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 ...

  4. 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".

  5. Human biology - Wikipedia

    en.wikipedia.org/wiki/Human_biology

    Human biology is an interdisciplinary area of academic study that examines humans through the influences and interplay of many diverse fields such as genetics, evolution, physiology, anatomy, epidemiology, anthropology, ecology, nutrition, population genetics, and sociocultural influences.

  6. 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.

  7. Satellite (biology) - Wikipedia

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

    A satellite is a subviral agent that depends on the coinfection of a host cell with a helper virus for its replication. Satellites can be divided into two major classes: satellite viruses and satellite nucleic acids. [1]

  8. Metamerism (biology) - Wikipedia

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

    Earthworms are a classic example of biological homonymous metamery – the property of repeating body segments with distinct regions. In biology, metamerism is the phenomenon of having a linear series of body segments fundamentally similar in structure, though not all such structures are entirely alike in any single life form because some of them perform special functions. [1]

  9. 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]