Pathogens share ribosomes as a cellular component for protein synthesis

Steps:

• Identify causative agents: HIV (retrovirus), Plasmodium (eukaryotic parasite for malaria), Mycobacterium tuberculosis (prokaryotic bacterium for TB).
• Analyze structures: All agents rely on ribosomal machinery—viruses hijack host ribosomes, while parasites and bacteria possess their own.
• Compare options: Evaluate which component is universally present or utilized across these diverse pathogens.
• Conclude common trait: Ribosomes enable protein production essential to their life cycles.

Why D is correct:

• Ribosomes are required for translation of genetic code into proteins, a universal process in all replicating pathogens per the central dogma of molecular biology.

Why the others are wrong:

• A: Not all have cell surfaces; viruses lack true cellular membranes.
• B: Viruses like HIV do not have a cell surface, only an envelope.
• C: Genes alone are too broad; all organisms have genes, but not specific to these pathogens.

Final answer: D