CELL STRUCTURES AND FUNCTION
BIO MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The enzyme becomes inactive
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The shapes of the enzyme are altered, 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: -Lower temperatures lead to slower chemical reactions. Enzymes will eventually become inactive at freezing temperatures but will restore most of their enzyme activity when temperatures increase again, while some enzymes lose their activity when frozen.
Detailed explanation-2: -In a cold environment, enzymes function more slowly because the molecules are moving more slowly. The substrate bumps into the enzyme less frequently. As the temperature increases, molecules move more quickly, so the enzyme functions at a higher rate.
Detailed explanation-3: -At low temperatures enzymes are simply inactive. As temperature is increased the enzymes and substrate gain kinetic energy (move more quickly). This increases the frequency of collisions and the formation of enzyme-substrate complexes.
Detailed explanation-4: -When an enzyme becomes denatured, it has lost some of its original properties. Denaturing can occur because of heat or from chemical reactions that have rendered the enzyme inactive.
Detailed explanation-5: -Because most animal enzymes rapidly become denatured at temperatures above 40°C, most enzyme determinations are carried out somewhat below that temperature. Over a period of time, enzymes will be deactivated at even moderate temperatures. Storage of enzymes at 5°C or below is generally the most suitable.