The variable part of an amino acid is the _____.
a. acid group
b. amino group
c. backbone
d. side chain
d. side chain
Proteins can be denatured by all of the following EXCEPT _____.
a. mercury
b. stomach acid
c. heat
d. freezing
e. radiation
d. freezing
Would you recommend an amino acid supplement to a friend who is recovering from illness and wants to promote muscle mass gain? Why or why not?
a. Yes, amino acid supplements are an excellent way to quickly provide energy to muscles for rebuilding.
b. Yes,
e. No; whole protein is better handled by the digestive system and will promote muscle mass gain better than amino acid supplements.
Which statement regarding digestion and absorption of proteins is true?
a. Cells in the small intestine possess different sites for absorbing different types of amino acids, which causes competition among amino acids at the absorption sites.
b. Proteins a
a. Cells in the small intestine possess different sites for absorbing different types of amino acids, which causes competition among amino acids at the absorption sites.
The process of protein turnover involves the _____.
a. conversion of half the protein we eat to glucose for energy
b. loss of amino acids by excretion through the kidneys when cells die
c. use of amino acids that have been conserved from the breakdown of
c. use of amino acids that have been conserved from the breakdown of old cells
Proteins play several important roles in the body. What is NOT one of these?
a. maintaining acid-base balance
b. serving as antibodies
c. providing an unlimited supply of energy
d. maintaining fluid and electrolyte balance
e. regulating gene expression
c. providing an unlimited supply of energy
What is an important function of the amino acid tyrosine?
a. It is used to make the neurotransmitter serotonin.
b. It is used to make the brown pigment melanin.
c. It is converted into the hormone insulin.
d. It is used to make the vitamin niacin.
e. It i
b. It is used to make the brown pigment melanin.
The most easily digestible form of protein can be found in which of the following foods?
a. pasta
b. black beans
c. peppers
d. peanuts
e. eggs
e. eggs
Who would benefit most from eating a variety of protein foods so that amino acids that are low in some foods will be supplied by the others?
a. a vegan
b. a lacto-ovo vegetarian
c. a carnivore
d. an omnivore
e. a pregnant woman
a. a vegan
Which of the following is NOT a consequence of protein deficiency?
a. slow growth in children
b. increased nutrient absorption from the digestive tract
c. a weakened immune system
d. impaired brain and kidney function
e. negative nitrogen balanc
b. increased nutrient absorption from the digestive tract
What advice would you give to a friend who has started a gluten-free diet to lose weight?
a. She should be successful because it is an excellent way to lose weight.
b. The gluten-free diet will help relieve any digestive symptoms she may have.
c. Gluten-f
d. Gluten-free weight-loss diets offer no advantages over other low-calorie diets.
Heavy use of soy products in place of meat can inhibit absorption of what nutrient?
a. phytochemicals
b. Iron
c. vitamin C
d. zinc
e. B12
b. Iron
What is required for legumes to "fix" nitrogen?
a. bacteria
b. fertilizer
c. UV light
d. crop rotation
e. genetic modification
a. bacteria
Which protein-rich food would be a good source of calcium for vegetarians?
a. margarine
b. flaxseeds
c. kidney beans
d. eggs
e. almonds
e. almonds
What is NOT one of the beneficial characteristics of a vegetarian diet?
a. It provides more phytochemicals.
b. It provides more antioxidant nutrients and fiber.
c. It provides more saturated fat.
d. It promotes a leaner body type.
e. It reduces the risk o
c. It provides more saturated fat.