WorksheetsChapter 8- Nutrients Essential to Key Body Functions
Total questions: 10
Worksheet time: 5mins
A coenzyme is
an inactive enzyme
any enzyme containing a B vitamin
a molecule that combines with and activates an enzyme
a molecule such as a B-vitamin that is released as a by-product of enzymatic reactions
The B-vitamin most important for the synthesis of nonessential amino acids is
thiamin
riboflavin
niacin
vitamin B6
Although a good source of many B-vitamins, a meal of brown rice, red beans, and fresh vegetables does not provide
thiamine
vitamin B6
folate
vitamin B12
A trace mineral critical for the synthesis of thyroid hormones is
iodine
chromium
manganese
sulfur
Oxidation is a chemical reaction during which
radiation causes a mutation in a cell's DNA
an atom loses an electron
an element loses an atom of oxygen
a compound loses a molecule of water
Which of the following is a role of both vitamin E and vitamin C?
Both vitamins spare vitamin A
Both vitamins donate electrons to free radicals
Both vitamins are critical cofactors in antioxidant enzyme systems
All of the above are true
Which of the following statements about beta-carotene is true?
Beta-carotene is a provitamin precursor of vitamin A
Beta-carotene is a water-soluble form of vitamin A
The RDA for beta-carotene is 12 times the RDA for vitamin A
We absorb a greater percentage of beta-carotene from fruits and vegetables consumed raw than from fruits and vegetables that have been cooked
The light-sensitive pigment rhodopsin
is a form of vitamin A that regenerates iodopsin
is found in the cone cells of the retina
transmits visual messages from the retina to the brain
is regenerated by a form of vitamin A
Pantothenic acid is found only in foods of animal origin.
True
False
Free radical formation can occur as a result of normal cellular metabolism.
True
False
