If one of the strands of DNA has the following sequence of...

If one of the strands of DNA has the following sequence of bases running in the $5^{\prime} \rightarrow 3^{\prime}$ direction,
a. what is the sequence of bases in the complementary strand?
b. what base is closest to the $5^{\prime}$ -end in the complementary strand?

Key Concepts

Complementary Base Pairing

DNA base pairing is highly specific due to hydrogen bonding between nitrogenous bases. Adenine (A) always pairs with thymine (T) via two hydrogen bonds, whereas cytosine (C) pairs with guanine (G) via three hydrogen bonds. This complementarity ensures accurate copying of the genetic information during cell division.

Directionality

Directionality in DNA refers to the orientation of the sugar-phosphate backbone, which has specific ends labeled 5' and 3'. Nucleotide addition during replication and transcription occurs in a specific direction, typically from the 5' end to the 3' end, influencing how complementary strands are synthesized.

DNA Structure

DNA (deoxyribonucleic acid) is a double-stranded molecule composed of nucleotides that include a sugar, phosphate group, and a nitrogenous base. The structure is characterized by its helical shape, where two complementary strands are held together by hydrogen bonds between paired bases, forming the famous double helix.

Antiparallel Orientation

The two strands in the DNA double helix run in opposite directions. One strand is oriented from the 5' end to the 3' end, while the complementary strand runs from the 3' end to the 5' end. This antiparallel arrangement is crucial for the mechanisms of DNA replication and transcription.

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