Please answer the following question: Answer the following question given this paragraph: A virus is a sub-microscopic particle that can infect living cells. Viruses are much smaller than prokaryotic organisms. In essence, a virus is simply a nucleic acid surrounded by a protein coat, as seen in the Figure below . This outer coat is called a capsid . Viruses will be discussed in more detail in the Viruses concepts. Q: In essence, a virus is simply a nucleic acid surrounded by what? Choices: - a membrane coat - a polymer coat - a polypeptide - a protein coat A:
A:
a protein coat