Which molecule has the shape of a double helix?
Answer and explanation
Correct answer: A. DNA
- Step 1: DNA consists of two polynucleotide strands wound around each other.
Answer
DNA.
Why not the others: mRNA: messenger RNA is a single strand. tRNA: transfer RNA is a single strand folded into a clover-leaf shape. A polypeptide: a polypeptide is a chain of amino acids, not a nucleic acid.
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