Identify the structures a virus can contain. check all that apply.

nucleic acid

ribosomes

cell membrane

capsid

envelope

Nucleic acids, capsid and envelop

A virus is a small infectious agent, that requires a living cell to replicate itself. It can infect life forms like animals, plants and microorganisms like bacteria and archaea. It consists of nucleic acid typically in the form of RNA, which is covered with protective coat of proteins also called as capsid. It derives an envelop of lipid from the cell membrane of the host cell.  

thymine. in rna, thymine is replace by uracil

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.