BIOLOGY 1A03 Lecture 1: Lecture 1

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

Document Summary

Anton van leeuwenhoek developed microscopes able to magnify 300x, things could now be seen at cellular level: able to look at sperm cells. Fluorescence microscopy antibodies are made and they are then used to attach fluorescent tag to what we wish to observe. Animal pancreatic cell exports digestive enzymes (rough er) Animal testis cell exports lipid-soluble signals (smooth er) We play host to 10x as many bacterial cells (prokaryotic cells) as eukaryote cells. Total number of cells in body ~110 trillion cells. 100 trillion bacterial cells found throughout our body. Healthy individuals may host up to ~10000 species of microbes. Microbiome population of microorganisms or microbes. Findings: babies have different gut microbes depending on their delivery (vaginal vs c-section) Skin bacteria on the skin is harmless but becomes pathogenic inside the body. Over 700 different species of bacteria in mouth. Some detrimental (i. e. dental plaque) streptococcus mutans. Streptococcus salivarius produces enzymes to help break down the plaque.