Amino acids are delivered to the ribosome by

A. Horizontal: Horizontal gene transfer refers to the movement of genetic material between organisms other than by descent; the toxin genes were transferred between different bacterial species, fitting this process.

B. Vertical: Vertical gene transfer occurs from parent to offspring during reproduction, not between unrelated bacteria.

C. Diagonal: Diagonal gene transfer is not a recognized biological process.

D. Jumping: “Jumping” may refer to transposons within a genome, but not to gene exchange between distinct organisms as described in this case.

A. Metabolism is the digestion of nutrients to release energy:
Digestion and energy release (catabolism) are parts of metabolism, but this statement omits the biosynthetic (anabolic) reactions that are also included.

B. Metabolism is the assembly of small molecules into macromolecules:
Assembly of small molecules (anabolism) is part of metabolism, but this statement excludes catabolic reactions that break down molecules.

C. Metabolism is all the chemical reactions of a cell (or organism), both anabolic and catabolic:
Metabolism encompasses both pathways that build molecules (anabolism) and pathways that break them down to release energy (catabolism), so this definition is comprehensive.

D. Metabolism is the production and expenditure of chemical energy:
Production and use of chemical energy are central aspects of metabolism but do not fully describe the wide variety of metabolic chemical transformations.

E. Metabolism is the assembly of macromolecules into cellular structures:
Assembly of macromolecules into structures (e.g., ribosomes, membranes) may occur, but metabolism more broadly includes many other chemical reactions beyond structural assembly.