In viruses, a combined structure formed by core (nucleic acid) and capsid is:

Explanation

Option A is correct.A)A nucleocapsid is the protein coat that surrounds the nucleic acid of a virus particle. It is made up of one or more types of proteins that are specifically encoded by the virus genome. The nucleocapsid protects the nucleic acid from damage and helps to direct the replication of the virus.It is made of nucliec acid(genome) and protein coat (capsid).It is the correct option.B) A virus envelope is the outermost layer of some viruses. It is made up of a lipid bilayer that is derived from the host cell membrane. The envelope contains viral proteins that help the virus to attach to and enter host cells. This option is incorrect.C) A capsomere is a protein subunit that makes up the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.The capsomeres protect against physical, chemical, and enzymatic damage and are multiply redundant; having a few protein subunits that are repeated. This option is incorrect.C) A capsomere is a protein subunit that makes up the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.The capsomeres protect against physical, chemical, and enzymatic damage and are multiply redundant; having a few protein subunits that are repeated. C) A capsomere is a protein subunit that makes up the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid.The capsomeres protect against physical, chemical, and enzymatic damage and are multiply redundant; having a few protein subunits that are repeated. D)Prions are infectious agents that are composed of misfolded proteins. Prions are not like other infectious agents, such as viruses or bacteria, because they do not contain any nucleic acids. Instead, they are simply misfolded proteins that can induce other proteins to fold abnormally. This can lead to the accumulation of misfolded proteins in the brain, which can cause damage and eventually death.This option is incorrect.