ANSC 326 Questions with complete solutions

Which of the four phases of a microbial population's growth and development would be the best for optimally preserving food quality, shelf life, and protecting food safety? Correct Answer-exponential? In the image below depicting the onset of sublethal injury in a population of a microorganism, which line (solid or dotted) correctly depicts the actual population of living/viable microorganisms during processing exposure and thereafter? Each line depicts the changes in counts of a microorganism in the food by use of a microbiological medium: the solid line on a non-selective medium and the dashed line on a selective medium. Correct Answer-solid line The image below demonstrates that with respect to a bacterium's response to an acidic environment, one mechanism of responding to excess acidity outside the cell is to activate an ATP-using pump to eject any protons that may enter the cell cytoplasm, though this consumes energy and may inactivate the cell through energy reserves depletion. Correct Answer-true As it regards acid tolerance responses, a chaperone protein may be produced in highly acidic conditions in order to assist survival by protecting native DNA supercoiling or protein folding structure. Correct Answer-true In a mixed microbial ecology, poor ________________ are organisms that tend to be ineffective at efficient