Алгебра
Английский
Биология
География
Геометрия
История
Русский
Обществознание
Физика
Химия
Информатика
Литература
МатематикаВопрос:
1. According to the text, what is the primary mechanism by which heat kills microorganisms? a) Dehydration of the cell b) Rupture of the cell wall c) Denaturation of proteins and enzymes d) Removal of nutrients
Ответ:
Ответ: c) Denaturation of proteins and enzymes
Краткое пояснение: Процесс денатурации, вызванный нагреванием, в первую очередь влияет на белки и ферменты микроорганизмов.
Согласно тексту, процесс денатурации, вызванный нагреванием, в первую очередь влияет на белки и ферменты микроорганизмов, что приводит к их гибели.
Ответ: c) Denaturation of proteins and enzymes
Похожие
- 2. The main goal of pasteurization, as opposed to sterilization, is to: a) Destroy all bacterial spores. b) Achieve complete product sterility. c) Kill most, but not all, microorganisms. d) Change the nutritional quality of the food.
- 3. Which of these factors does NOT affect the heat treatment required to kill microorganisms? a) The kind of organism b) The color of the food c) The environment during heating d) The state of the organism (e.g., spore)
- 4. The High-Temperature-Short-Time (HTST) method is characterized by: a) A low temperature applied for a very long time. b) A comparatively high temperature applied for a short time. c) The use of electric currents instead of steam. d) Temperatures always exceeding 100°C.
- 5. Why might a processor choose pasteurization over sterilization for a product? a) To guarantee an indefinite shelf life at room temperature. b) When a more rigorous heat treatment could harm the product's quality. c) Because it is always a less expensive process. d) To destroy all heat-resistant spores.
- 6. Ultra-High-Temperature (UHT) processing is primarily used for: a) Canning low-acid vegetables. b) Pasteurizing beer and fruit juices. c) Milk processing. d) Dehydrating foods.
- 7. According to the text, what must be done after the heat treatment in a pasteurization process? a) The products must be cooled promptly. b) The products must be stored in the dark. c) The products must be frozen immediately. d) The products must be packaged under vacuum.
- 8. What is a key difference between the HTST and LTH pasteurization methods? a) HTST uses dry heat, while LTH uses steam. b) HTST is only for liquids, while LTH is for solids. c) They use different combinations of time and temperature. d) LTH is only used for acidic products.
