Campbell Biology 11th Edition by Lisa Urry,Michael Cain,Steven Wasserman,Peter Minorsky,Jane Reece

Exercise 1

What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized
A) The origins of replication occur only at the 5 end.
B) Helicases and single-strand binding proteins work at the 5 end.
C) DNA polymerase can join new nucleotides only to the 3 end of a pre-existing strand.
D) DNA ligase works only in the 3 5 direction.