Microbiology (MCB 2010) Chapter 5 Quiz with complete solutions

Sterile Correct Answer-Is an item free of microbes including endospores, but does not consider prions Sterilization Correct Answer-The removal or destruction of all microorganisms Commercial Sterilization Correct Answer-Conditions achieved by application of heat which renders food free from microorganisms capable of growing in the food at temperatures at which the food is likely to be held during distribution and storage. Commercial Canning Process Correct Answer-• Uses industrial-sized autoclave called retort • Designed to destroy Clostridium botulinum endospores * reduce 10^2 endospores to only 1 * virtually impossible to have that many endospores • Critical because endospores could germinate in canned foods; cells grow in low-acid anaerobic conditions and produce botulinum toxin • Endospores of some thermophiles may survive • Usually not a concern; only grow at temperatures well above normal storage