DNA sequences that .a. do not code for proteins are structural, with repeated and translocated sections. b. regulate gene expression. c. transcribe mRNA, tRNA, and rRNA. d. are nonfunctional pseudogenes. e. All of the answer choices are correct.

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.