The Ultimate Checkpoint Science Practice Test

What are chromosomes made of?

DNA RNA Protein Lipids

Correct Answer:

DNA

Explanation:

Chromosomes are built around DNA. The DNA molecule carries the genetic instructions that define inherited traits, and in chromosomes it is packaged with histone proteins into a condensed structure called chromatin, which allows long DNA molecules to fit inside the cell nucleus and be efficiently organized during cell division. So the material that chromosomes are made of is DNA, with proteins helping package and regulate it. RNA plays a role in reading and expressing genetic information but is not the main component of chromosomes, and lipids are not involved in chromosome makeup.

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