A 5-year-old boy has bloody diarrhea for 2 days, nausea, abdominal cramps, and vomiting. He subsequently undergoes acute renal failure. Upon questioning the mother, it is learned that the diarrhea started 24 hours after the child had eaten a hamburger at a fast-food restaurant. Which of the following is the likely cause of this disease?
A. Bacillus cereus
B. Vibrio cholerae
C. Escherichia coli strain O157:H7
D. Staphylococcus aureus
E. Salmonella typhi
Ans: C. Escherichia coli strain O157:H7
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Both walnut and Gingko trees lose their leaves in the fall when day length starts decreasing. Based on these observations one may conclude that many tree species will lose their leaves in the fall in response to decreasing day length. This statement is an example of:
A. inductive reasoning B. a theory C. deductive reasoning D. an experiment
When water ionizes, it produces equal amounts of hydrogen and hydroxide ions that can reassociate with each other. The pH of water is:
A. 3 B. 4 C. 5 D. 6 E. 7
The contractile ring that works with animal cells could not work with plant cells because __________. Fill in the blank(s) with the appropriate word(s)
Nate is gaining weight, is often tired, and feels cold. His thyroid hormone level is high as is the level of TSH. Nate also has a goiter. Which of these diagnoses is the most likely for Nate's condition?
A) defective thyroid hormone receptors in his body cells B) insufficient iodine in his diet C) defective receptors for thyroid hormone control by the anterior pituitary D) too much iodine in the diet