Question

1. before cells divide, dna is copied through the process of replication. the double helix is unzipped and new nucleotides bind to their complementary bases on the free strands, forming ______ duplicates of the original.

a. two
b. five
c. three
d. four

Explanation:

In DNA replication, the double - helix structure of DNA is unzipped. Each of the original strands serves as a template for the synthesis of a new complementary strand. Through this semi - conservative replication process, one original DNA molecule gives rise to two DNA molecules, each of which is an exact duplicate of the original (each has one original strand and one newly synthesized strand). So the number of duplicates formed is two.

Answer:

a. Two