Purines and pyrimidines are two classes of organic bases found in ____
a. sugars
b. phosphates
c. fats
d. carbohydrates
e. nucleic acids
e
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Greenhouse gases are associated with all except:
a. global warming. b. coral bleaching. c. cooling of Arctic waters. d. sea level rise. e. melting of glaciers.
Four of these five statements about ozone are correct. Select the exception
a. Ground-level ozone forms when compounds released by burning or evaporating fossil fuels are exposed to sunlight. b. Warm temperatures retard ground-level ozone formation. c. Avoiding the gas pump in the heat of the day will limit ozone pollution. d. Ozone is an eye and respiratory tract irritant. e. Ozone is a necessary part of the upper atmosphere but is a pollutant at ground level.
Which of the following statements is FALSE regarding a rightward shift in the hemoglobin-oxygen dissociation curve?
A) Affinity for oxygen is decreased. B) Hemoglobin unloading of oxygen is increased. C) It can be caused by a decrease in 2,3-BPG. D) Oxygen loading onto hemoglobin is decreased. E) A rightward shift usually occurs in active tissue.
New government regulations require that foods containing trans fats be labeled appropriately. A trans fat is formed when food manufacturers turn liquid oils into solid fats by adding hydrogen to vegetable oils
This hydrogenation process produces a solid fat because adding the hydrogen A) causes a phospholipid to form. B) allows fats to form tertiary and quaternary structures. C) forms a wax molecule. D) allows the fatty acid chains to pack together more tightly.