Which of these is necessary for only the first step of pcr? a) the four dna nucleotides b) dna primers c) original template dna d) dna polymerase e) all of these choices are correct.

The term autotroph refers to an organism that: a. uses co2 for its carbon source. b. must obtain organic compounds for its carbon needs. c. gets energy from sunlight. d. gets energy by oxidizing chemical compounds. e. does not need a carbon source