Exam - Zinc

Question 1

supplement label

Answer 1

helps maintain immune function

Question 2

where is zinc found in the body

Answer 2

in all organs, tissues, and bodily fluids (Zn2+)

Question 3

what is the best food source for zinc

Answer 3

oysters

Question 4

what are additional food sources for zinc

Answer 4

redmeat/chicken
beans
buts
crab
lobster
fortified cereal
dairy

Question 5

3 main functions of zinc

Answer 5

1. zinc-containing metalloenzymes
2. oxidant defense
3. DNA binding

Question 6

how many zinc-containing metalloenzymes are known

Answer 6

More than 200

Question 7

what are zinc-containing metalloenzymes involved in

Answer 7

all metabolic pathways

Question 8

what do zinc-containing metalloenzymes provide

Answer 8

structural integrity by stabilizing tertiary protein structure

Question 9

what do zinc-containing metalloenzymes play a role at

Answer 9

the reaction site of an enzyme

Question 10

what must occur to zinc before absorption

Answer 10

must be released from amino acids by HCl and other digestive enzymes

Question 11

2 ways that zinc can be absorbed

Answer 11

carrier-mediated (ZIP4) - primary
simple diffusion

Question 12

why is male RDA higher

Answer 12

to support testosterone function

Question 13

why is pregnant women’s RDA highest

Answer 13

to support fetal development

Question 14

is zinc deficiency common in humans

Answer 14

yes - older adults, children and vegetarians

Question 15

what can poor zinc absorption be caused by

Answer 15

phytic acid in grains

Question 16

what can zinc deficiency do in children

Answer 16

slow growth (inadequate cell division), poor wounds healing, delayed sexual maturation, impaired taste

Question 17

what can zinc toxicity lead to

Answer 17

neurological problems, numbness, metallic taste, nausea - causes copper deficiency due to activation of metallothionein