WHAT DO we know about the new coronavirus?
A spiky, round or elliptical juggernaut, measuring from 60 to 140 billionths of a
meter across, has turned the world upside down in just a few weeks. What is it?
The 1)______belongs to the family Coronaviridae, which are RNA viruses with
relatively large genomes. The SARS-Cov-2 virus has 29,891 nucleotides. That’s
twice as large as an 2)______virus genome. What’s more, the coronavirus family
undergoes relatively rapid 3)______“recombination” in nature, including
4)_______that enable the virus to adapt to new 5)_____and environmental
niches. In this case, the genetic blueprint probably came initially from nature,
perhaps from bats.
A cousin of this virus is SARS-Cov-1, which caused an 6)______of severe acute
7)________ syndrome in 2002 and 2003 that began in China and ended with 774
deaths in 17 countries. The genetic material in the current virus is an 82 percent
match for the earlier SARS virus. Another type of coronavirus found in bats is an
89 percent match for the current virus. Not every mutation changes behavior, but
even a minuscule change in the genetic makeup may have given the current virus
the characteristics that allowed it to 8)________, thrive and unleash the current
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1) virus
2) influenza
3) genetic
4) mutations
5) host
6) epidemic
7) respiratory
8) survive
9) pandemic
10) parasite
11) cell
12) illness
13) colds
14) lethal
15) transmissible
16) nose
17) throat
18) cough
19) droplets
20) survival
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