Thyroid stimulating immunoglobin causes hyperthyroidism because ______
Fill in the blank(s) with the appropriate word(s).
Ans: it bypasses the effects of negative feedback on both the hypothalamus and pituitary
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Consider a mutant organism that is unable to make the amino acid arginine. Knowing that the metabolic pathway for
arginine production is ornithine ® citrulline ® arginine, you test the ability of the mutant to grow in the presence of just one of these compounds. You find that the mutant can grow in the presence of arginine, but not in the presence of citrulline or ornithine. From this, you can conclude that the product of the mutant gene is most directly involved in the production of ____.
a. arginine from ornithine b. arginine from citrulline c. citrulline from ornithine d. ornithine from arginine e. citrulline from arginine
Young birds see objects flying overhead and respond by crouching down into the nest and remaining still. Over time some objects become familiar and the young birds do not crouch down. What is this type of learning?
A. sensitization B. associative learning C. operant conditioning D. habituation E. Pavlovian conditioning
Which of the following was the first protein whose tertiary structure was determined?
A) myoglobin B) insulin C) actin D) hemoglobin E) collagen
Which of the following situations might cause normal microbiota to become opportunistic pathogens?
A) growth of microbes on the surface of intact skin B) growth of microorganisms on the excreted cellular wastes and dead cells in the large intestine C) treatment of a cancer patient with radiation D) growth of Lactobacillus on the surface of teeth E) presence of Entamoeba in the lumen of the colon