info@bestmytest.com GMAT TOEIC IELTS TOEFL

keratin

Find out how TOEFL Tutor can help you achieve your target score

definition: 
A fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws, horns, etc.
sentence: 
Amino acids are absorbed by the body to help build keratin, the main protein in hair.
difficulty: 
hard
toefl frequency: 
1
toefl classification: