BIOLOGY 172 Lecture 1: Intro & Scope of Bio (Lectures 1-2)

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Two major themes in biology: the diversity of life, the unity of life. Unity in diversity: remarkable similarities at the cellular and molecular levels. Example: cilia of vastly different organisms are nearly indistinguishable. Protists (single celled organisms) cilia on their cell surface. Animal cells many have cilia on their cell surface: all living organisms on earth: Store their genetic information in dna (lecture 6) Utilize proteins as the main source of catalysts (lecture 5) Us the same 20 amino acids to build proteins and all cells use the same genetic code (lecture 3 & 19) Use lipids and proteins to make membranes (lectures 8-9) Utilize similar energy-containing molecules (like atp) to help facilitate chemical reactions (lectures 12-13: this has led to a unifying theory that all life on earth evolved from a common ancestor. Evolution helps explain both the unity and diversity of life.

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