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  2. AD 12 - Wikipedia

    en.wikipedia.org/wiki/AD_12

    AD 12 was a leap year starting on Friday of the Julian calendar. At the time it was known as the Year of the Consulship of Caesar and Capito (or, less frequently, year 765 Ab urbe condita ). The denomination AD 12 for this year has been used since the early medieval period , when the Anno Domini calendar era became the prevalent method in ...

  3. 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.

  4. List of unsolved problems in biology - Wikipedia

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

    Biological homochirality.What is the origin of homochirality in living organisms? In biological organisms, amino acids appear almost exclusively in the left-handed form and sugars in the right-handed form.

  5. Flashcard - Wikipedia

    en.wikipedia.org/wiki/Flashcard

    As such, flashcards are often used to memorize vocabulary, historical dates, formulae, or any subject matter that can be learned via a question-and-answer format. Flashcards are an application of the testing effect, the finding that long-term memory is increased when some part of an individual's learning period is devoted to retrieving ...

  6. Cell cycle - Wikipedia

    en.wikipedia.org/wiki/Cell_cycle

    The eukaryotic cell cycle consists of four distinct phases: G 1 phase, S phase (synthesis), G 2 phase (collectively known as interphase) and M phase (mitosis and cytokinesis). M phase is itself composed of two tightly coupled processes: mitosis, in which the cell's nucleus divides, and cytokinesis, in which the cell's cytoplasm and cell membrane divides forming two daughter cells.

  7. Apoptosis - Wikipedia

    en.wikipedia.org/wiki/Apoptosis

    Apoptosis (from Ancient Greek: ἀπόπτωσις, romanized: apóptōsis, lit. 'falling off') is a form of programmed cell death that occurs in multicellular organisms and in some eukaryotic, single-celled microorganisms such as yeast. [1]

  8. Abiogenesis - Wikipedia

    en.wikipedia.org/wiki/Abiogenesis

    The likely answer to this challenge is that the evolutionary process could have involved molecular self-replication, self-assembly such as of cell membranes, and autocatalysis via RNA ribozymes. [ 5 ] [ 6 ] [ 11 ] Nonetheless, the transition of non-life to life has never been observed experimentally, nor has there been a satisfactory chemical ...

  9. Biochemical switches in the cell cycle - Wikipedia

    en.wikipedia.org/wiki/Biochemical_switches_in...

    The cell cycle is a series of complex, ordered, sequential events that control how a single cell divides into two cells, and involves several different phases. The phases include the G1 and G2 phases, DNA replication or S phase, and the actual process of cell division, mitosis or M phase. [ 1 ]