(a)[2]
State the defining features of a virus, such as picornavirus.
(b)[3]
State, with reasons, whether a picornavirus is visible under a light microscope.
(c)[3]
With reference to Fig. 1.1, describe the way the picornavirus enters the host cell.
Biology 9700 · AS & A Level · Infectious diseases
Infectious diseases — practice question
Picornaviruses are tiny viruses with a diameter of $30\,\text{nm}$. They can enter mammalian and bird cells and then replicate inside them. Fig. 1.1 illustrates a picornavirus entering its host cell.