Please help I am so bad at science at times! Thank youu!

List four observations that indicate that a chemical reaction may be taking place

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products