| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| Like nails, horns & hair, feathers contain this fibrous structural protein | keratin | $800 | DJ | BIOLOGY | 2013-06-11 | #6627 | |
| Like human hair, a bird's feathers are made of this protein | keratin DD | $500 | J | BIOLOGY | 1993-10-05 | #2087 |