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  2. Determination of sex - Wikipedia

    en.wikipedia.org/wiki/Determination_of_sex

    Prenatal sex determination is prenatal testing for discerning the sex of a person or other animal before birth. Techniques include: Cell-free fetal DNA testing, wherein a venipuncture is performed on the mother to analyze the small amount of fetal DNA that can be found within it.

  3. IISER Aptitude Test - Wikipedia

    en.wikipedia.org/wiki/IISER_Aptitude_Test

    IAT consists of 60 questions: 15 questions each from Biology, Chemistry, Mathematics, and Physics. Total time for answering the test is 3 hours. Questions are of multiple choice type with only one correct answer. Each correct answer is awarded 4 marks. Each incorrect answer leads to the deduction of 1 mark. Unanswered questions are awarded 0 mark.

  4. 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 ...

  5. Evolutionary pressure - Wikipedia

    en.wikipedia.org/wiki/Evolutionary_pressure

    It is a quantitative description of the amount of change occurring in processes investigated by evolutionary biology, but the formal concept is often extended to other areas of research. In population genetics, selective pressure is usually expressed as a selection coefficient.

  6. Tawjihi - Wikipedia

    en.wikipedia.org/wiki/Tawjihi

    To sit for the exam, students are required to finish 2 years of pre-school education, 10 years of basic education, and 2 years of secondary academic or vocational education (Tawjihi year). Subjects in the exam include Arabic, English, Mathematics, Physics, Biology, Chemistry, Computer Science, Geology, Civil Studies and Islamic studies (unless ...

  7. Immunoglobulin class switching - Wikipedia

    en.wikipedia.org/wiki/Immunoglobulin_class_switching

    Mechanism of class-switch recombination that allows isotype switching in activated B cells. Immunoglobulin class switching, also known as isotype switching, isotypic commutation or class-switch recombination (CSR), is a biological mechanism that changes a B cell's production of immunoglobulin from one type to another, such as from the isotype IgM to the isotype IgG. [1]

  8. Biomolecule - Wikipedia

    en.wikipedia.org/wiki/Biomolecule

    A general name for this class of material is biological materials. Biomolecules are an important element of living organisms. Biomolecules are an important element of living organisms. They are often endogenous , [ 2 ] i.e. produced within the organism, [ 3 ] but organisms usually also need exogenous biomolecules, for example certain nutrients ...

  9. Hydra (genus) - Wikipedia

    en.wikipedia.org/wiki/Hydra_(genus)

    Hydra (/ ˈ h aɪ d r ə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.They are native to the temperate and tropical regions. [2] [3] The genus was named by Linnaeus in 1758 after the Hydra, which was the many-headed beast of myth defeated by Heracles, as when the animal has a part severed, it will regenerate much like the mythical hydra's heads.

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