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.
PRO TIP: If you know youâre going to need a carry-on or a checked bag, buy it right when you book your flight to save major moola. Personal item (e.g., purse, small backpack, etc.): Dimensions must not exceed 16 x 14 x 12 inches (40 x 35 x 30 cm) including handles and wheels. For travel after 3/31/2016, dimensions must not exceed 17 x 13 x 8 inches (43 x 33 x 20 cm) including handles and wheels. Carry-on bag: Maximum of 22 x 18 x10 inches (56 x 46 x 25 cm) including handles and wheels.