The Z-form of DNA
A) does not exist in nature.
B) is right-handed.
C) tends to occur in purine-only sequences.
D) tends to occur in pyrimidine-only sequences.
E) tends to occur in alternating purine-pyrimidine sequences.

Question

Quizplus · Accepted Answer

The Z-form of DNA is characterized by a left-handed double helix, and it tends to occur in regions where purine and pyrimidine bases alternate. This structural form is less common than the right-handed B-form DNA but can be found in nature under certain conditions, such as high salt concentrations or in actively transcribed DNA.

The Z-Form of DNA