What are proteins made of?
AnswerAmino acids
Proteins are chains of amino acids.
Science · Facts & stats
Protein facts & stats
7 fact-checked facts about proteins, amino acids and protein biology, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Proteins that speed up chemical reactions are called what?
AnswerEnzymes
Most enzymes are proteins.
Going deeper
How many standard amino acids are used to build human proteins?
Answer20
The genetic code specifies 20 standard amino acids.
Hair and nails are made mainly of which protein?
AnswerKeratin
Keratin is a tough structural protein.
Which cell structure builds proteins?
AnswerRibosome
Ribosomes translate mRNA into protein.
Expert level
What type of chemical bond links amino acids in a protein?
AnswerPeptide bond
Peptide bonds join amino acids into chains.
How many nucleotides make up one codon that specifies an amino acid?
Answer3
Each codon is a three-letter code.
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