Multiple Choice
Which of the following is true about the structure of DNA?
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14. DNA Synthesis
Discovering the Structure of DNA
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Which best describes the structure of DNA?
A
A circular molecule with no distinct ends
B
A triple helix with three strands intertwined
C
A single-stranded molecule with a linear sequence
D
A double helix with two strands running in opposite directions
Verified step by step guidance1
DNA is a type of nucleic acid that carries genetic information in living organisms and many viruses.
The structure of DNA is described as a double helix, which means it consists of two strands that are twisted around each other.
Each strand of the DNA helix is composed of nucleotides, which include a sugar molecule, a phosphate group, and a nitrogenous base.
The two strands of DNA run in opposite directions, which is referred to as antiparallel orientation. This means one strand runs in a 5' to 3' direction, while the other runs in a 3' to 5' direction.
The strands are held together by hydrogen bonds between complementary bases: adenine pairs with thymine, and cytosine pairs with guanine.
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