BIOLOGY 1M03 Lecture Notes - Lecture 1: Progenitor Cell, Cell Membrane, Cell Theory

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15 May 2017
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Both are unified by the concepts of ancestry and descent. Evolutionary relationships among species can be represented by phylogenetic trees. Living organisms share these 5 characteristics: are composed of one or more membrane bound units called cells, store and process heritable information, dna, capable of replicate or reproduce, evolve as populations, use energy, atp. Evolution is changes in allele frequencies over time. A cell is a highly organized compartment bound by a plasma membrane that contains concentrated chemicals in aqueous solutions. The cell theory states that all organisms are composed of cells, and that cells come from pre-existing cells. In multicellular organisms, all cells are descended from a progenitor cell, zygote. Zygote is the product of the union of a sperm and egg. Cells contain molecular information in the form of dna. Dna encodes all biological processes and physical attributes. Cells have a boundary between them and the environment. Cells have the ability to harness materials and/or energy.

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