Final answer:
The false statement about Z-DNA is that its strands are not antiparallel; Z-DNA does have antiparallel strands.
Step-by-step explanation:
The statement about Z-DNA that is FALSE is: "Its strands are not antiparallel." Z-DNA is a left-handed helix with a zigzag configuration and is typically found in GC-rich sequences. However, similar to the more common B-DNA, Z-DNA has antiparallel strands, which means one strand runs in the 5' to 3' direction opposite to the other strand running from 3' to 5'.