Final answer:
The claim that poxviruses are circular in shape is false. Poxviruses are known for their complex, often brick-shaped structure with detailed surface characteristics, not a simple circular form.
Step-by-step explanation:
The statement that the classic shape of pox virus is circular is false. Viruses exhibit a variety of shapes including cylindrical (helical), polyhedral (icosahedral), complex, or enveloped. Poxviruses, like the vaccinia virus, are known for their complex shapes, which are often brick-shaped and exhibit intricate surface characteristics. This differs significantly from a simple circular shape. For example, the icosahedral structure, which can be seen in viruses like the varicella-zoster virus, features a three-dimensional, 20-sided structure with 12 vertices, bearing resemblance to a soccer ball rather than being circular.