Question

The following virus group has cubic symmetry: A. Tipula Iridescent, B. Canine hepatitis, C. Influenza, D. Vaccinia, E. Polyoma.

• A. A, B and D only
• B. A, B and E only
• C. B and C only
• D. A and C only

Hint:

Cubic symmetry usually means icosahedral symmetry. Influenza is helical and vaccinia is complex.

Answer 1

The Correct Option is B

Concept:
Viruses may show different types of symmetry such as helical symmetry, cubic or icosahedral symmetry, and complex symmetry.

Step 1: Understand cubic symmetry.
Cubic symmetry is generally represented by icosahedral symmetry. Many animal viruses show this type of symmetry.

Step 2: Check Tipula Iridescent virus.
Tipula Iridescent virus shows icosahedral or cubic symmetry. \[ A \text{ is correct} \]

Step 3: Check Canine hepatitis virus.
Canine hepatitis virus is an adenovirus-type virus, and adenoviruses have icosahedral symmetry. \[ B \text{ is correct} \]

Step 4: Check Influenza virus.
Influenza virus has helical nucleocapsid symmetry, not cubic symmetry. \[ C \text{ is incorrect} \]

Step 5: Check Vaccinia virus.
Vaccinia virus has complex symmetry. \[ D \text{ is incorrect} \]

Step 6: Check Polyoma virus.
Polyoma virus has icosahedral symmetry. \[ E \text{ is correct} \] Thus, the correct group is: \[ A,\ B \text{ and } E \] \[ \therefore \text{Correct Answer is (B)} \]