Which of the following statements about enzymes is true? . a. enzymes are able to heat up molecules so that they can react.. b. enzymes always provide carbon dioxide for chemical reactions.. c. enzymes are biological catalysts which act on a substrate.. d. enzymes absorb excess heat so that reactions occur at low temperatures.

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.