166
Lesson 166 of 500 · Extra Passages
⭐ 30 XPDNA and Genes Part 3
📖Story Brief #166
DNA, or deoxyribonucleic acid, is the molecule that carries the genetic instructions for all living organisms.
🎯 Your mission
Read carefully. Then prove you understood.
⚡ The twist
Slow down. The first answer that pops up isn't always the right one.
Read this passage
Highlight speedNormal
DNA, or deoxyribonucleic acid, is the molecule that carries the genetic instructions for all living organisms. It is structured like a twisted ladder, known as a double helix, made up of four building blocks called nucleotides. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base. The order of these bases determines the information encoded in the DNA. Genes are specific segments of DNA that provide the instructions for making proteins, which perform most of the functions in our bodies. For example, the gene that determines eye color is made up of a specific sequence of nucleotides. When cells use the information in genes, they produce proteins that influence traits, like hair color or height. Thus, DNA and genes play crucial roles in inheritance and the diversity of life.
Check Your Understanding
Question 1
1 of 2What structure represents DNA?
🏆
Stretch Challenge
Try this in real life this week.
Read for 10 minutes today — anything you want.
👨👩👧
For the dinner table
“What's one thing you read today that surprised you?”
🎯
Next Smart Lesson
We'll pick a lesson that matches exactly how well you're reading right now.
📄Share card
Share this lesson
Send it to a parent or fellow reader. 5 minutes is all it takes.
🖨️View in Shop
Checkout complete lesson on Extra Passages for 8th Grade
Get the full Extra Passages track as a printable PDF — all lessons, worksheets, and answer keys.