What is the twisted ladder shape of the DNA called? 3-D model
nucleotides
double helix
single strand
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Double helix.

Explanation: It's called a double helix because it looks like a double helix.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.