13. chemical bonds a. combine compounds to form elements. b. are always covalent. c. hold atoms together to form compounds. d. are always ionic.

answer; ///i do believe that the correct answer is (c) hold atoms together to form compound;

the correct answer is c   with the systems

answer: glucoamylase presented optimum activity at temperature of 55â°c, and, in the glycosidic bonds from the non-reducing ends of starch, resulting in the production of glucose. source and type of fermentation can affect the enzyme's properties

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