The re-closing of Purine ring in step 11 doesn't consume ATP. Why?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon

Compare sympathetic and parasympathetic