California 8th Grade Science Test (CAST) Practice Exam 2026 – The All-in-One Study Resource for Success!

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Which term describes the structure that contains many genes arranged along a thread?

Proteins

Genes

DNA

Chromosome

Chromosomes organize genetic information within the cell. They are long DNA molecules wrapped around proteins, forming threadlike structures. Along a chromosome, many genes are arranged in a line, each gene a specific sequence that carries instructions. A gene is a portion of DNA, and DNA is the material that carries the genetic code. But a chromosome is the structure that holds many genes along a single thread. Proteins are the products coded by genes, not the structure that contains them. So the word that describes the structure containing many genes arranged along a thread is chromosome.