front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |review

Think of an example of a helix, like a spiral staircase, make a small hole down its longitudinal axis, insert the nucleic acid. The structural unit or capsomere is a single molecule of the one capsid protein. These structural units make the stairs of the spiral staircase.