Purines and pyrimidines are two classes of organic bases found in ____

a. sugars
b. phosphates
c. fats
d. carbohydrates
e. nucleic acids


e

Biology & Microbiology

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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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology