It depends on which virus you are referring to specifically. Viruses come in many shapes and types; their variations are tremendous.
For HIV and Influenza, viruses acquire their envelops after maturation, during the budding off or detachment stage from the host cell.
Hope this helps! :)
C) voltage gated sodium channels
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Transportation is the cells way of brining in and expelling molecules, ions, et cetera. This is useful because a cell can receive what it needs at all times via transport but also have the ability to rid the cell of unnecessary molecules that aren't needed.
Every atom<span> is made </span>up<span> of </span>three kinds<span> of smaller </span>particles<span>, called protons (which are positively charged), neutrons (which have no charge) and electrons (which are negatively charged).</span>
