name:
____ 8. which layer of the hair shaft creates the shine and the smooth, silky feel of healthy hair?
a. hair cuticle
b. hair cortex
c. arrector pili
d. hair medulla
____ 9. which term refers to a layer that protects the hair from penetration and prevents damage to hair fibers?
a. hair cuticle
b. hair follicle
c. cortex
d. medulla
____ 10. the fibrous protein core formed by elongated cells that contains melanin pigment is the ____.
a. cuticle
b. sebum
c. cortex
d. medulla
____ 11. the hair shaft that emerges from the scalp is a nonliving fiber composed of ____.
a. keratinized acids
b. hydrogen bonds
c. melanin protein
d. keratinized protein
____ 12. hair is approximately: ____ percent protein.
a. 30
b. 50
c. 70
d. 90
____ 13. a long chain of amino acids linked by peptide bonds is called a ____ chain.
a. amino - peptide
b. polymer
c. keratin
d. polypeptide
____ 14. the three different types of side bonds that link chains of amino acids together are ____.
a. oxygen, hydrogen, and salt
b. hydrogen, ionic, and carbon
c. ionic, helix, and disulfide
d. hydrogen, salt, and disulfide
____ 15. what type of bond is broken by wetting the hair with water and is reformed when the hair dries?
a. salt bond
b. hydrogen bond
c. disulfide bond
d. peptide bond

Question

name:
____ 8. which layer of the hair shaft creates the shine and the smooth, silky feel of healthy hair?
    a. hair cuticle
    b. hair cortex
    c. arrector pili
    d. hair medulla
____ 9. which term refers to a layer that protects the hair from penetration and prevents damage to hair fibers?
    a. hair cuticle
    b. hair follicle
    c. cortex
    d. medulla
____ 10. the fibrous protein core formed by elongated cells that contains melanin pigment is the ____.
    a. cuticle
    b. sebum
    c. cortex
    d. medulla
____ 11. the hair shaft that emerges from the scalp is a nonliving fiber composed of ____.
    a. keratinized acids
    b. hydrogen bonds
    c. melanin protein
    d. keratinized protein
____ 12. hair is approximately: ____ percent protein.
    a. 30
    b. 50
    c. 70
    d. 90
____ 13. a long chain of amino acids linked by peptide bonds is called a ____ chain.
    a. amino - peptide
    b. polymer
    c. keratin
    d. polypeptide
____ 14. the three different types of side bonds that link chains of amino acids together are ____.
    a. oxygen, hydrogen, and salt
    b. hydrogen, ionic, and carbon
    c. ionic, helix, and disulfide
    d. hydrogen, salt, and disulfide
____ 15. what type of bond is broken by wetting the hair with water and is reformed when the hair dries?
    a. salt bond
    b. hydrogen bond
    c. disulfide bond
    d. peptide bond

Accepted Answer

### Question 8
# Brief Explanations:
The hair cuticle is the outermost layer of the hair shaft, and it's responsible for the shine and smooth, silky feel of healthy hair. The arrector pili is a muscle, the hair cortex is the middle layer (gives strength/color), and the hair medulla is the innermost (not for shine/smoothness). So the correct option is a. Hair Cuticle.
# Answer:
a. Hair Cuticle

### Question 9
# Brief Explanations:
The hair cuticle is the protective outer layer of the hair that prevents penetration and damage to hair fibers. Hair follicle is the structure from which hair grows, cortex is the middle layer, and medulla is the innermost. So the correct option is a. Hair cuticle.
# Answer:
a. Hair cuticle

### Question 10
# Brief Explanations:
The cortex of the hair is the fibrous protein core formed by elongated cells containing melanin pigment (which gives hair color). Cuticle is outer layer, sebum is an oil, medulla is innermost (not the protein core with melanin). So the correct option is c. cortex.
# Answer:
c. cortex

### Question 11
# Brief Explanations:
The hair shaft emerging from the scalp is composed of keratinized protein (keratin), which is non - living. Keratinized acids are not the main component, hydrogen bonds are bonds (not the main component of the shaft), and melanin protein is for color (not the main structural component). So the correct option is d. keratinized protein.
# Answer:
d. keratinized protein

### Question 12
# Brief Explanations:
Hair is approximately 90 percent protein (keratin is the main protein). 30, 50, and 70 are incorrect percentages for hair's protein content. So the correct option is d. 90.
# Answer:
d. 90

### Question 13
# Brief Explanations:
A long chain of amino acids linked by peptide bonds is called a polypeptide chain. Amino - peptide is not the standard term, polymer is a general term (not specific to amino acid chains linked by peptide bonds), and keratin is a type of protein (not the name for the chain of amino acids). So the correct option is d. polypeptide.
# Answer:
d. polypeptide

### Question 14
# Brief Explanations:
The three types of side bonds that link chains of amino acids (polypeptide chains in hair) are hydrogen, salt (ionic), and disulfide bonds. Oxygen, hydrogen, and carbon are not side bonds in this context; hydrogen, ionic, and carbon is incorrect (carbon not a side bond); ionic, helix, and disulfide is incorrect (helix is a structure, not a bond). So the correct option is d. hydrogen, salt, and disulfide.
# Answer:
d. hydrogen, salt, and disulfide

### Question 15
# Brief Explanations:
Hydrogen bonds in hair are broken when hair is wetted and reform when the hair dries. Salt bonds are also affected by pH, but hydrogen bonds are more associated with water - related breaking and reforming. Disulfide bonds are strong and not broken by water, and peptide bonds are the bonds between amino acids in the chain (not broken by water). So the correct option is b. Hydrogen bond.
# Answer:
b. Hydrogen bond

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 8

Answer:

Question 9