Question

A single strand of DNA helix has the code CGCTAA. Which would be the complementary code on the other strand of the helix?

Answer 1

The correct answer is option 4, that is, GCGATT.  

Complementary strand refers to either of the two chains, which forms a double helix of DNA, with corresponding positions on the two chains comprising of a pair of complementary bases. It is a section of one nucleic acid, which is bonded to another by an alignment of base pairs.  

In nature, complementarity refers to the base principle of DNA transcription and replication as it is a characteristic shared between the two RNA or DNA sequences, such that when they are arranged antiparallel to each other, the nucleotide bases at each position in the sequences will be complementary.  

Answer 2

If one strand of DNA has CGCTAA code then the other strand will have GCGATT code.

Further Explanation:

DNA molecules exist in the double-stranded form in the living organism. These strands are antiparallel to each other because when one strand runs in 5’ to 3’ direction then the other strand runs in 3’ to 5’ direction. DNA is composed of sugar molecules, a nitrogenous base (adenine, guanine, thymine, and cytosine) and a phosphate molecule. The sequence of the nitrogenous base makes up the genetic code in the living system. The code present on one strand is always complimentary to the code present on another strand as adenine always base pairs with the thymine and cytosine always base pairs with guanine. The two strands of DNA joined to each other through a hydrogen bond. There is the presence of a double bond between adenine and thymine and triple between guanine and cytosine. Thus, a DNA molecule has a double-helical structure.

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Answer Details:

Grade: Middle school

Chapter: Genetics

Subject: Biology

Keywords:

DNA, organism, nitrogenous base, adenine, guanine, thymine, cytosine, phosphate molecule, genetic code, hydrogen bond.