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.
B
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A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
Single-celled eukaryotic organisms that lack chlorophyll are called
A. Algae. B. Protozoa. C. Chlorophyta. D. Salmonella.
Animal fats and plant oils are sometimes used as sources of fuel for automobile engines. How is energy harvested from these molecules?
a. They contain hydrogen and carbon tails linked by disulfide bridges that, when broken, release chemical energy. b. They contain long chains of hydrogen and carbon that, when broken, release the energy stored in the bonds linking the atoms together. c. They contain long carbon tails and each atom has unpaired electrons that are released on exposure to extreme heat and pressure. d. They contain long hydrophobic regions that, when mixed with water, generate explosive resistances. e. They contain multiple phosphate groups that each release energy when "liberated" from the molecule chemically.
Regulatory factors that bind to enzymes ____
a. always increase enzyme activity b. always decrease enzyme activity c. alter the shape of the enzyme d. alter the pH at which the enzyme works e. alter the temperature at which the enzyme works