Step 1: Concept Overview:
The question seeks to identify the false statement regarding the terminology for viral structures, specifically the protein spikes on a viral envelope. While "plant viruses" are mentioned, the terminology applies broadly to virology. Most plant viruses lack envelopes, but the focus is on the names given to envelope spikes.
Step 2: Detailed Analysis:
Definitions of the terms in the options:
Protomers: These are structural protein subunits that assemble into larger structures, such as a capsid. While envelope proteins consist of protomers, the spike itself isn't termed a protomer.
Peplomers: This is the accurate term for the glycoprotein spikes protruding from the envelope of an enveloped virus, derived from the Greek 'peplos' (robe/envelope). Therefore, statement (C) is correct.
Capsomers: These are the structural subunits of the viral capsid, the protein shell enclosing the nucleic acid. They are not located on the envelope. Hence, statement (D) is technically incorrect as a descriptor of envelope spikes.
Concatemers: This term describes long, continuous DNA molecules containing multiple copies of the same DNA sequence linked in series. It relates to viral genome replication (e.g., in bacteriophages) and is unrelated to envelope proteins or spikes. This statement is definitively incorrect.
Comparing the incorrect statements, statement (B) uses a completely irrelevant term from viral genome replication. Statements (A) and (D) use terms related to viral structure but misapply them to envelope spikes. However, "concatemers" is the most fundamentally incorrect term.
Step 3: Conclusion:
The incorrect statement is that envelope spikes are called concatemers. Concatemers pertain to DNA replication, not protein structures.