Vitamin D can be made in the body with the help of:
a. bacteria.
b. tryptophan.
c. vitamin A.
d. sunlight.
Q. 2Monozygotic twins are _____, while dizygotic twins are _____.
a. always the same sex; always different sexes
b. the same sex 50 of the time; always the same sex
c. always the same sex; the same sex 50 of the time
d. always different sexes; always the same sex
e. the same sex 50 of the time; always different sexes
Q. 3Among fruits and vegetables, the best sources of beta-carotene are:
a. green or yellow, like lettuce and corn.
b. dark green or deep orange, like broccoli and sweet potatoes.
c. green, like lettuce, peas, and snap beans.
d. brightly colored, like tomatoes and lemons.
Q. 4The majority of twins born are _____.
a. dizygotic
b. monozygotic
c. trizygotic
d. identical
e. dizygotic and identical
Q. 5Identify the food group that is the best source of beta-carotene.
a. protein foods group
b. milk group
c. vegetable group
d. grain group
Q. 6Which type of multifetal pregnancy is most common?
a. twins
b. triplets
c. quadruplets
d. quintuplets
e. heptuplets
Q. 7If your eyes have difficulty adjusting to dim light, eating which of the following foods daily might improve your vision?
a. steamed carrots
b. a peanut butter sandwich
c. brewer's yeast
d. pork chops
Q. 8The vanishing twin phenomenon refers to _____.
a. more triplets and quadruplets being born than twins due to fertility drugs
b. the disappearance of embryos within 13 weeks of conception
c. the decreasing percentage of dizygotic twins in favor of monozygotic twins
d. the emergence of an additional fetus in a pregnancy that began with only two fetuses
e. the decreasing percentage of twins in favor of single-child births due to in vitro fertilization techniques
Q. 9Vitamin A toxicity is likely to result from:
a. consuming too many dark green and deep orange vegetables.
b. overconsumption of whole grains.
c. consuming large amounts of fortified foods or vitamin A supplements.
d. drinking too much orange juice.
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