Which part of a virus should be removed to make it harmless?
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A virus consists of two or three parts: genes, made from either DNA or RNA, long molecules that carry genetic information; a protein coat that protects the genes; and in some viruses, an envelope of fat that surrounds the protein coat and is used, in combination with specific receptors, to enter a new host cell. Viruses vary in shape from the simple helical and icosahedral to more complex. Viruses range in size from 20 to 300 nanometers; it would take 33,000 to 500,000 of them, side by side, to stretch to 1 centimetre (0.39 in).
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