Common biopolymers across life forms

Steps:

• Identify biopolymers essential for structure and function in viruses (genome and capsid), prokaryotes (DNA, RNA, proteins), and eukaryotes (DNA, RNA, proteins).
• Note viruses contain proteins and nucleic acids but lack complex carbohydrates or lipids as standard polymers.
• Confirm prokaryotes and eukaryotes share proteins and nucleic acids universally.
• Exclude any polymer not present in all viruses, as they are acellular.

Why B is correct:

• Proteins (1) form viral capsids and cellular structures; nucleic acids (2) store genetic information in DNA/RNA across all, per central dogma of molecular biology.

Why the others are wrong:

• A includes 3 (e.g., polysaccharides), absent in viruses.
• C excludes 2, but nucleic acids are universal for replication.
• D excludes 1, but proteins are required for viral assembly and cellular function.

Final answer: B