Question

1. Describe the structural differences bewtween an isocahedral and helical virus particle.

2. What advantages do these arranges provide to a virus that has limited coding capacity for a single capsid protein?

3. What is the difference bewtween a five-fold and six-fold axis of symmetry?

*I need questions 2 and 3 answered. Thank you.

Answer 1

Q.1

Ans: An icosahedral virus ia virus consisting of identical subunits that make up equilateral triangle that are in turn arrangement in a symmetrical fashion.

Helical structure : Many rod shaped and filamentous plant viruses have capsid with helical symmetry.

Q.2

Ans: a) Protect the genome.

B) Deliver the genome

C) Contract with the host.

Q.3

Ans : Six fold axis symmetry : A six fold axis involves rotating the object by 60 degree and inverting through a center . This operation is identical to having the combination of 3 fold rotation axis perpendicular to a mirror plane.

Five folded axis symmetry: 5 folded symmetry also known as radial symmetry in biology. The five fold symmetry is not present in crystal.