Picornaviruses are small viruses that are $30\ \text{nm}$ in diameter. Picornaviruses are able to enter the cells of mammals and birds and can replicate within these cells. Fig. 1.1 shows the entry of a picornavirus into its host cell. (a) State the key features of a virus, such as picornavirus. (b) State, with reasons, whether a picornavirus can be seen using the light microscope. (c) With reference to Fig. 1.1, describe how the picornavirus enters the host cell.

Biology 9700/22 — May/June 2020

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Topics Cell Structure · Biological Molecules · Cell Membranes and Transport · Transport in Mammals · Infectious Diseases · Immunity · +5 more

Q1Cell StructureCell Membranes and TransportFree sample

Picornaviruses are small viruses that are $30\ \text{nm}$ in diameter. Picornaviruses are able to enter the cells of mammals and birds and can replicate within these cells.

Fig. 1.1 shows the entry of a picornavirus into its host cell.

Fig. 1.1

(a)

State the key features of a virus, such as picornavirus.

(b)

State, with reasons, whether a picornavirus can be seen using the light microscope.

(c)

With reference to Fig. 1.1, describe how the picornavirus enters the host cell.

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