Do enzymes change on their own? Why or why not?

What is the importantence of the carbon and nitretan cycles in the environment

Which of these has happened to your food by the time it reaches your small intestine? a. all the macromolecules have been broken down completely. b. lipids and starches have been partially broken down. c. starches and proteins have been partially broken down. d. proteins and lipids have been broken down into subunits.

Dna replication or repair occurs in a cell in all of thw following situations except when