In every DNA molecule:
A) the number of adenine molecules is the same.
B) the total number of nitrogen-containing bases is the same.
C) the sugar is deoxyribose.
D) the order of nitrogen-containing bases is the same.
E) a single sugar-phosphate backbone is present.
C) the sugar is deoxyribose.
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A female from one species does not recognize the mating patterns of a male from another species. What type of reproductive isolation is occurring?
a. mechanical b. ecological c. gamete incompatibility d. temporal e. behavioral
Which naturally occurring plant hormone has a major role in the phototropic response of plants?
A. Ethylene B. Auxin C. Abscisic acid D. Gibberellin E. 2, 4-D
The cuticle
a. conserves water. b. reduces absorption of carbon dioxide by the plant. c. relegates transpiration to the stomata. d. helps prevent wilting. e. does all of these.
Mucous membranes are quite thin and fragile. How can such delicate tissue provide defense against microbial invaders?
A. the mucus secreted by the mucous membrane physically traps microbes. B. the mucus contains a variety of antimicrobial chemicals and molecules. C. both the mucus and the outer layer of cells are shed frequently. D. the mucus is a physical trap that contains a variety of antimicrobial chemicals. E. the mucus physically traps microbes, contains a variety of antimicrobial chemicals, and is shed constantly, along with the outermost layer of cells.