Which of the following experiments helped B. F. Skinner develop the idea of operant conditioning?
A. Young geese were exposed to Skinner shortly after their birth so they would think he was their mother.
B. A dog would salivate when presented with a bowl of food so a bell was rung to build the association between the bell and food.
C. A dog was trained to put its paw on a lever in order to receive a pellet of food as a reward.
D. A rat was trained to run a maze in a short amount of time in order to receive a reward.
E. A rat was trained to pull a lever to receive a reward of a food pellet.
Answer: E
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A tube coagulase test was performed on catalase-positive, gram-positive cocci that were ?-hemolytic and grew on mannitol salt agar. The tube was checked after overnight incubation and was negative. Which of the following statements explains this discrepancy?
a. A tube coagulase should not be performed on a catalase-positive organism. b. A ?-hemolytic colony, which is catalase positive and grows on mannitol salt, is normally coagulase negative. c. The test should have been read in 1 to 4 hours in case any hemolysins are present. d. No discrepancy is present; the results are accurate.
What is the primary stain in Schaeffer-Fulton endospore staining?
What will be an ideal response?
Anaphase _______________________.
A. involves the lining up of the chromosomes across the equatorial plate. B. is the same in mitosis and meiosis I and II. C. is initiated when the chromosomes begin to move apart D. results in an unequal distribution of chromosomes to the resulting cells E. occurs after telophase
Cells carry out three major types of work. Which of the following involves energy for cell motility and the movement of structures within cells?
A. Chemical work B. Mechanical work C. Transport work D. None of the choices are correct.