Final answer:
The idea of complementary strands in DNA means that the two strands of DNA are complementary to each other, allowing for accurate replication. Complementary base pairing occurs between adenine and thymine, and between guanine and cytosine.
Step-by-step explanation:
The idea of complementary strands in DNA refers to the fact that the two strands of DNA are complementary to each other. This means that the sequence of bases in one strand can be used to create the correct sequence of bases in the other strand. For example, if one strand has the sequence AGTCATGA, the complementary strand would have the sequence TCAGTACT.
This complementarity of the two strands is important for DNA replication. During replication, the two strands of the double helix separate and each strand serves as a template for the synthesis of a new complementary strand. This allows for the accurate replication of DNA.
Complementary base pairing occurs between adenine (A) and thymine (T), and between guanine (G) and cytosine (C). Adenine always pairs with thymine, and guanine always pairs with cytosine.