In addition to carbon dioxide, which of the following are also considered to be greenhouse gases?
A. water vapor and methane
B. methane
C. oxygen
D. water vapor
E. methane and oxygen
A
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Which of the following is true regarding the amniotic egg of snakes, turtles, etc.?
A. Fertilization must take place after the egg has formed. B. The egg is impermeable to gases such as oxygen or carbon dioxide. C. The egg is vulnerable to desiccation (water loss). D. The embryo's nutritional needs are met by a large yolk or placenta.
The main nutrient storage molecule in fungi is
A. cellulose, a carbohydrate. B. glycogen, a carbohydrate. C. chitin, a carbohydrate. D. starch, a polysaccharide. E. glucose, a monosaccharide.
Which of the following is NOT found in every nucleic acid?
a. ribose b. phosphate group c. purine d. pyrimidine e. uracil
Which of the following pairs of molecules can be held together by a hydrogen bond?
A) one polar molecule and one nonpolar molecule B) two negative ions C) two nonpolar molecules D) two polar molecules