Chapter 21, Problem 21.131EP

(a)

Interpretation Introduction

Interpretation: The Vitamin which acts as a water-soluble antioxidant has to be stated.

Concept introduction: Some vitamins are fat soluble and some are water soluble.  Water soluble vitamins are B and C.  All of the B vitamins serve as precursors for enzyme cofactors.  Vitamin C is not an enzyme cofactor precursor.

(b)

Interpretation Introduction

Interpretation: The Vitamin which acts as a fat-soluble antioxidant has to be stated..

Concept introduction: Fat soluble vitamins are A, D, E and K and rest all vitamins are water soluble.  Fat soluble vitamins can act as anti oxidants.

(c)

Interpretation Introduction

Interpretation: The Vitamin which is involved in process of vision has to be stated.

Concept introduction: Normal dietary intake provides a person with the precursor forms of vitamin A.  Vitamin A provides visual pigment rhodopsin.  The conversion of light energy into nerve impulses that are sent to the brain involves the participation of rhodopsin.

(d)

Interpretation Introduction

Interpretation: The Vitamin which is involved in the formation of collagen has to be stated.

Concept introduction: Vitamin C is a water soluble vitamin.  It is involved in the formation of collagen.