BIOLOGY 1A03 Lecture Notes - Lecture 7: Peptide, Petri Dish, Microbiological Culture

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Ben J Evans

Document Summary

Some of these aerobic environments can be recreated in the laboratory using culture media, stock-filled with amino acids, vitamins, nucleotides and carbohydrates. Favourable temperatures, depending on type of prokaryote, will maximize growth. Environments can undergo change; prokaryote must adapt to what is available, requiring gene regulation in order to respond to their environment. Bacterial nucleoid dna contains info required to orchestrate response to environmental changes: housekeeping genes: genes contained in dna, required at all times for normal functions. Constitutively expressed, they are always being transcribed and translated. Eg. genes for structure proteins, rna/dna polymerases, ribosomal proteins, etc. While bacterial cells respond to changing environments, housekeeping genes allow for the constant maintenance of general cellular activities: regulated genes: genes turned on and off on an as-needed basis. When exposed to a changing environment, bacterial cells can respond by altering the expression pattern of some genes. As a result, regulated bacterial genes can be transcribed/translated.