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  2. AP United States History - Wikipedia

    en.wikipedia.org/wiki/AP_United_States_History

    The AP U.S. History exam lasts 3 hours and 15 minutes and consists of two sections, with the first (Section I) being divided into two parts. Section I part A includes 55 multiple-choice questions with each question containing four choices.

  3. Multiple choice - Wikipedia

    en.wikipedia.org/wiki/Multiple_choice

    A multiple choice question, with days of the week as potential answers. Multiple choice (MC), [1] objective response or MCQ(for multiple choice question) is a form of an objective assessment in which respondents are asked to select only the correct answer from the choices offered as a list.

  4. Bacteria - Wikipedia

    en.wikipedia.org/wiki/Bacteria

    [25] [26] There are thought to be approximately 2×10 30 bacteria on Earth, [27] forming a biomass that is only exceeded by plants. [28] They are abundant in lakes and oceans, in arctic ice, and geothermal springs [ 29 ] where they provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and ...

  5. Enzyme - Wikipedia

    en.wikipedia.org/wiki/Enzyme

    In 1877, German physiologist Wilhelm Kühne (1837–1900) first used the term enzyme, which comes from Ancient Greek ἔνζυμον (énzymon) 'leavened, in yeast', to describe this process. [12] The word enzyme was used later to refer to nonliving substances such as pepsin , and the word ferment was used to refer to chemical activity produced ...

  6. List of topics characterized as pseudoscience - Wikipedia

    en.wikipedia.org/wiki/List_of_topics...

    Free energy – a class of perpetual motion that purports to create energy (violating the first law of thermodynamics) or extract useful work from equilibrium systems (violating the second law of thermodynamics). [34] [35] Water-fueled cars – an instance of perpetual motion machines. Such devices are claimed to use water as fuel or produce ...

  7. Massachusetts Institute of Technology - Wikipedia

    en.wikipedia.org/wiki/Massachusetts_Institute_of...

    The Science Requirement, generally completed during freshman year as prerequisites for classes in science and engineering majors, comprises two semesters of physics, two semesters of calculus, one semester of chemistry, and one semester of biology. There is a Laboratory Requirement, usually satisfied by an appropriate class in a course major.

  8. Multiplex (assay) - Wikipedia

    en.wikipedia.org/wiki/Multiplex_(assay)

    In the biological sciences, a multiplex assay is a type of immunoassay that uses magnetic beads to simultaneously measure multiple analytes in a single experiment. [1] A multiplex assay is a derivative of an ELISA using beads for binding the capture antibody. Multiplex assays are still more common in research than in clinical settings. [2]

  9. John C. Calhoun - Wikipedia

    en.wikipedia.org/wiki/John_C._Calhoun

    [12] [13] Calhoun made friends easily, read widely, and was a noted member of the debating society of Brothers in Unity. He graduated as valedictorian in 1804. He graduated as valedictorian in 1804. He studied law at the nation's first independent law school, Tapping Reeve Law School in Litchfield, Connecticut , where he worked with Tapping ...