Describe how vitamin C, iron, and copper interact to allow metalloenzyme function to proceed.
What will be an ideal response?
As an electron donor, vitamin C has a cofactor role for several metalloenzymes and has antioxidant defense functions. Metalloenzymes contain metals, such as iron, copper, or zinc (usually as an ion), as a part of their structures. When a metalloenzyme catalyzes a reaction, the metal ion becomes oxidized. For example, reduced iron (ferrous, Fe2+) is converted to its oxidized form (ferric, Fe3+) during enzymatic activity. Ascorbic acid, by donating an electron to the oxidized iron, keeps the iron in its reduced ferrous form. This, in turn, allows enzymatic action to continue.
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Essential fat in adult males is estimated to be about ____ percent of body weight
A) 1 B) 3 C) 5 D) 7
A woman lost her job and experienced a severe food shortage near the end of her pregnancy. She lost weight during this period caused by malnutrition. The infant born to this woman is most likely to be classified as _____.
A. very small for gestational age (vSGA) B. disproportionately small for gestational age (dSGA) C. proportionately small for gestational age (pSGA) D. appropriate for gestational age (AGA) E. large for gestational age (LGA)
An important function of fat in the body is to ____
a. build muscle tissue b. regulate blood glucose levels c. protect vital organs against shock d. provide precursors for glucose synthesis e. facilitate reproduction
Pesticides are chemicals
A) used on crops to decrease destruction caused by weeds, animals, insects, and fungi. B) produced by microorganisms that harm tissue and elicit an immune response. C) added to food that help prevent microbial spoilage and enzymatic deterioration. D) added to food to enhance them in multiple ways.