BIOLOGY 1A03 Lecture Notes - Lecture 1: Respiratory Tract, Membrane Fluidity, Bacteroides

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Rosada Silva

Document Summary

Theme 1: module 1: the composition and structure of membranes. 10 trillion cells as an adult: consider this: we carry prokaryotic cells (cells that do not contain a true nucleus). About ten times as many bacterial cells as eukaryotic cells. These cells make up 2-3% of your body mass. Human microbiome: microbiome: describes populations of microbiotic organisms within our bodies, microorganisms are not visible to the naked eye, only under microscopes, the microbiome consists of prokaryotic bacteria and small eukaryotic organisms, ex. Streptococcus salivarius is a normal habitant of the upper respiratory tract and oral cavity. Contribute to the formation of plaque: ex. Can be pathogenic if it enters the body: ex. Makes enzymes that are useful in the breakdown of plant materials that we ingest, such as oat fiber. Unit 2 phospholipids are the building blocks of membranes. Cells are made up of 4 classes of biological molecules: a cell is a membrane bound structure containing macromolecules.