BIO315H5 Lecture 1: L0: Introduction

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The cell is the unit of life - all living things start from one cell. All cells carry their hereditary information in the form of dna. Dna encodes for proteins that serve as the catalyst for most of the chemical reactions in the cell. Review: central dogma of molecular biology: dna to rna to protein (replication, transcription, translation) All cells function as biochemical factories, and as such require free energy to drive cellular processes. Proteins do most of the work in the cell. Has a very organized structure with organelles, different and specific functions. Actin filaments and microtubules: structures, moves things around the cell. Organization: from cell to tissue to organ to organism. Adaptation: change over time in response to environment, e. g. physiology. Response to stimuli: it can sense and respond. Signaling through g protein-coupled receptors and second messengers. 2nd messengers allow molecules to move within the cell. Cellular compartmentalization: trafficking of proteins and membrane vesicles.

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