Which of the following describes the direction in which nucleotides are added onto a growing DNA strand during DNA replication in cells?
a. in the 3' ? 5' direction for the leading strand, and the 5' ? 3' direction on the lagging strand
b. in the 5' ? 3' direction only
c. in the 5' ? 3' direction for the leading strand, and the 3' ? 5' direction on the lagging strand
d. in either the 5' ? 3' direction or the 3' ? 5' direction on both strands, depending on where replication begins
Answer: b. in the 5' ? 3' direction only
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