A virus is basically a tiny bundle of genetic materialâeither DNA or RNAâcarried in a shell called the viral coat, or capsid, which is made up of bits of protein called capsomeres. Some viruses have an additional layer around this coat called an envelope. That's basically all there is to viruses. virus is basically a tiny bundle of genetic materialâeither DNA or RNAâcarried in a shell called the viral coat, or capsid, which is made up of bits of protein called capsomeres. Some viruses have an additional layer around this coat called an envelope. That's basically all there is to viruses.
For all United EconomyÂ® tickets, Premier Gold members are eligible for two complimentary checked bags at 70 pounds (32 kg) each for travel between the U.S., Canada, Puerto Rico and the U.S. Virgin Islands.
American and United charge $20 for the first bag, $30 for the second (although United offers a $5 per bag discount for online payment). Of the major airlines, only Southwest charges no fee for the first or second item of checked luggage.merican and United charge $20 for the first bag, $30 for the second (although United offers a $5 per bag discount for online payment). Of the major airlines, only Southwest charges no fee for the first or second item of checked luggage.