Concept explainers
DNA Structure. Carefully inspect the double-stranded DNA molecule shown here, and notice that it has twofold rotational symmetry:
Label each of the following statements as T if true or F if false.
- (a) There is no way to distinguish the right end of the double helix from the left end.
- (b) If a solution of these molecules were heated to denature them, every single-stranded molecule in the solution would be capable of hybridizing with every other molecule.
- (c) If the molecule were cut at its midpoint into two halves, it would be possible to distinguish the left half from the right half.
- (d) If the two single strands were separated from each other, it would not be possible to distinguish one strand from the other.
- (e) In a single strand from this molecule, it would be impossible to determine which is the 3′ end and which is the 5″ end.
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Becker's World of the Cell (9th Edition)
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