A small section of a chromosome that instructs the cell to manufacture proteins needed to sustain life and development is the:

A) nucleus.
B) gene.
C) genotype.
D) zygote.

Chromosome

A thread-like structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.

Protein

is an essential nutrient made of amino acids, critical for the building, maintenance, and repair of tissues in the body.