What is a form of sterilization using high temperatures for short periods of time, followed by chilling?
Pasteurization
Irradiation
High-pressure processing
Canning
The Correct Answer is A
A. Pasteurization is a process in which food or beverages are heated to a specific temperature for a short period of time to kill harmful microorganisms, followed by rapid cooling to prevent bacterial growth. This method is commonly used for milk, juices, and some liquid foods to improve safety and extend shelf life without significantly altering flavor or nutritional value. High-temperature, short-time (HTST) pasteurization is the most common method.
B. Irradiation exposes food to ionizing radiation to destroy bacteria, parasites, and other pathogens. It does not involve heating or chilling and is a different method of sterilization.
C. High-pressure processing uses extreme pressure to inactivate microorganisms in food. It preserves food without heat, maintaining taste and nutrients, and is not the same as heat-based pasteurization.
D. Canning involves sealing food in containers and heating it to destroy microorganisms for long-term storage. Unlike pasteurization, canning uses longer heat exposure and does not necessarily involve rapid chilling afterward.
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Related Questions
Correct Answer is B
Explanation
A. Four hours is longer than the recommended safe time for perishable foods to remain at temperatures where bacteria can grow. Even with cool weather, bacteria multiply rapidly in the “danger zone” (40°F–140°F).
B. Perishable foods, including cooked meats, salads with mayonnaise, eggs, and cut fruits, should not be left out at room temperature for more than 2 hours (or 1 hour if the ambient temperature is above 90°F). Keeping foods on ice helps slow bacterial growth, but 2 hours is the generally accepted limit to prevent foodborne illness. After this period, foods should be discarded to ensure safety.
C. Thirty minutes is unnecessarily conservative for most outdoor temperatures. While shorter exposure is safer, perishable foods can remain safe for up to 2 hours under controlled conditions with ice.
D. Six hours far exceeds the safe limit. Perishable foods left out this long, even on ice, are at high risk for bacterial contamination and could cause foodborne illness.
Correct Answer is A
Explanation
A. These fish are high in mercury, a heavy metal that can cross the placenta and harm the developing fetal nervous system. Mercury exposure during pregnancy is associated with impaired cognitive development, delays in walking and talking, and other neurological deficits. Pregnant women are advised to avoid shark, swordfish, tilefish, and king mackerel to minimize these risks.
B. While these fish are high in protein, protein itself is beneficial during pregnancy and is not a reason to avoid these fish. The concern is specifically related to mercury content, not protein.
C. These fish are not low in minerals. In fact, fish generally provide important nutrients like selenium, iodine, and omega-3 fatty acids, which are beneficial during pregnancy.
D. Digestibility is not the issue. The problem is the potential toxic effect of mercury, not the difficulty of digesting the fish.
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