Look at the image. Which two bases bond together in DNA? A. Cytosine-Guanine
B. Cytosine-Thymine
C. Cytosine-Uracil
D. Cytosine-Adenine​

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.