How do enzymes speed up chemical reactions? Enzymes
A) lower the activation energy of chemical reactions.
B) raise the temperature of the cell, speeding chemical reactions.
C) store ATP, allowing more energy to be used in chemical reactions.
D) act as miniature 'transfer trucks', gathering m

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: