Which of the following pairs of nucleotide bases are complementary in DNA?

Prepare for the HSC Biology Exam. Study with interactive quizzes, flashcards, and detailed explanations. Master key concepts and pass your exam confidently!

In DNA, nucleotides are paired in a specific manner known as complementary base pairing. This means that certain bases will always bond together due to the chemical structure and hydrogen bonding characteristics of the bases. Adenine (A) pairs specifically with Thymine (T), while Guanine (G) pairs with Cytosine (C).

The statement that Adenine pairs with Thymine and Guanine pairs with Cytosine reflects the base pairing rules established by Watson and Crick and is fundamental to the structure of DNA. Each pair forms hydrogen bonds that stabilize the DNA double helix structure, enabling accurate replication and transcription processes essential for genetic function.

The other combinations incorrectly suggest pairings that do not occur in DNA, such as pairing A with G or A with C, which do not align with the established base pairing rules. Therefore, the answer reflects the foundational principles of DNA structure.

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