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DNA Code and Proteins
Age 13 · Biology
DNA looks like a twisted ladder, and its rungs are made of four chemical bases. A gene is a sequence of these bases that tells a cell which protein to build; a mutation changes the sequence and can change the protein.
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Age 13: open this week
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In the picture
- The twisted ladder shape of DNA
- The four kinds of colored base rungs
- A cell that reads a base sequence
- A smooth folded protein built from linked amino acids
- A crumpled protein made after a mutation changes a base sequence
Examples
- A gene for eye color contains a base sequence that helps build a protein in the eye.
- A mutation in a gene can make a protein that works differently, sometimes causing a genetic disease.
Key takeaways
- DNA carries instructions in the order of four chemical bases.
- A mutation can change a protein’s shape and how it works.
Quiz: DNA Code and Proteins (Age 13)
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What is the shape of DNA?
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What is a gene?
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What can a mutation do to a protein?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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