SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The enzymes die.
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The shapes of the enzyme are altered or denatured
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The enzymes’ amino acid sequence changes.
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The enzymes remain the same
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Detailed explanation-1: -High heat destroys enzymes. Enzymes are protein molecules that get denatured at high temperatures. High heat breaks hydrogen and ionic bonds leading to disruption in enzyme shape. The enzyme loses its activity and can no longer bind to the substrate.
Detailed explanation-2: -Because enzymes are proteins, they are denatured by heat. Therefore, at higher temperatures (over about 55°C in the graph below) there is a rapid loss of activity as the protein suffers irreversible denaturation.
Detailed explanation-3: -Heat can break hydrogen and ionic bonds, which disrupts the shape of the enzyme and will change the shape of the active site. Cold temperatures do not denature enzymes because cold does not cause chemical bonds to break. Enzymes are suited to function best within a certain temperature, pH, and salt concentration range.
Detailed explanation-4: -Denaturation of enzymes causes bonds to be broken, structure to be disrupted and it stops functioning. This happens to enzymes when they are exposed to extreme, unsuitable conditions, for instance, high temperatures or extreme pH levels.
Detailed explanation-5: -Enzyme denaturation occurs when an enzyme loses its native conformation, or three-dimensional structure, rendering it unable to bind to substrate and catalyze product formation. The two main causes for enzyme denaturation are deviations from optimal temperature and pH.