18) Why does a DNA strand grow only in the 5' to 3' direction?A) because DNA polymerases can only add nucleotides to the 3' end of the growing moleculeB) because DNA polymerases can only add nucleotides to the 5' end of the growing moleculeC) because the DNA molecule only unwinds in the 5' to 3' directionD) because DNA polymerase requires the addition of a starter nucleotide at the 5' endAnswer: ATopic: 10.5Skill: Knowledge/Comprehension