Bacterial ribosomes ________.
A. comprise two tRNA binding sites, three rRNA subunits, and multiple proteins
B. comprise multiple tRNA binding sites, three proteins, and two rRNA subunits
C. comprise two rRNA subunits, multiple proteins, and three tRNA binding sites
D. comprise two proteins, three tRNA binding sites, and multiple rRNA subunits
Answer: C
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Which of the following species concepts might differentiate species on the basis of specific dietary requirements?
A. Ring species B. Ecological species C. Evolutionary species
For a typical flowering plant, the first cell of the triploid (3n) endosperm is formed from
a. one sperm fused with two antipodal cells. b. two sperm fused with the egg. c. one sperm fused with the central cell. d. one sperm fused with the egg. e. two sperm fused with a synergid.
In Figure 16.1, how many mL is the inspiratory capacity?
A) 2200 B) 1300 C) 600 D) 2800 E) 1700
In a classic experiment from the 1930s, a biologist conducted selective breeding experiments involving maze-running behavior in rats
He repeatedly bred together males and females that made the fewest mistakes, and he also bred together males and females that made the most mistakes. After eight generations, all mice that descended from "maze-smart" parents were better at running the maze than all mice that descended from "maze-dumb" parents. This study indicates that A) rats move through a maze randomly. B) trial-and-error learning in rats appears to have a genetic component. C) maze running is a purely learned behavior. D) nothing can be concluded about maze-running behavior in rats. E) maze running is a purely innate behavior in rats.