Choose the Following Statements That Describe Keratin

question 75

Multiple Choice

Choose the following statements that describe keratin.
1) Keratin is a tough,fibrous protein.
2) Keratin is used for pigmenting skin.
3) Keratin helps protect the skin.
4) Keratin participates in immune responses.
5) Keratin protects the skin from UV light.

• A)1 and 3
• B)1,3,4,5
• C)2,4,5
• D)1,2,3,4,5
• E)3 and 5

---

Definitions:

Certain Knowledge

Knowledge that is absolutely sure, indubitable, and beyond any possibility of doubt.

Descartes

René Descartes, a French philosopher, mathematician, and scientist, known for his statement "Cogito, ergo sum" (I think, therefore I am).

Astronomical Theory

A scientific theory or set of principles that aims to explain phenomena observed in astronomy, such as the motions of celestial bodies or the evolution of the universe.

Sunset

The time in the evening when the sun disappears below the horizon.