Which of the following statements regarding a dna double helix is true? the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine. the amount of adenine is equal to the amount of uracil, and the amount of guanine is equal to the amount of cytosine. the amount of adenine is equal to the amount of guanine, and the amount of thymine is equal to the amount of cytosine. the amount of adenine is equal to the amount of guanine, and the amount of uracil is equal to the amount of thymine. the amount of adenine is equal to the amount of cytosine, and the amount of guanine is equal to the amount of thymine.