During DNA replication,Select one:A. tRNAs bring specific amino acids to an mRNA molecule.B. amino acids are joined.C. the DNA double helix comes apart, and new nucleotides are brought in, forming two double helices.D. two single strands of DNA come together, restoring complementary base pairing
The correct answer is C
C. the DNA double helix comes apart, and new nucleotides are brought in, forming two double helices.
During DNA replication, the double helix structure of DNA is unwound and unzipped by the enzyme DNA helicase. This separation of the two strands creates a replication fork. Once the strands are separated, new nucleotides are brought in to match the exposed DNA bases, following the base pairing rules (adenine with thymine, guanine with cytosine).
The enzyme DNA polymerase then adds these nucleotides to the growing new strands, synthesizing complementary strands to the original DNA strands. Each original DNA strand serves as a template for the creation of a new complementary strand. As a result, two identical copies of the original DNA molecule are formed.
So, during DNA replication, the DNA double helix comes apart, and new nucleotides are brought in to form two double helices, each containing one original DNA strand and one newly synthesized strand.
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