On June 30, a 47-year-old man was hospitalized with dizziness, blurred vision, slurred speech, difficulty swallowing, and nausea. Examination revealed facial paralysis. He reported eating home-canned green beans and stew containing roast beef and potatoes 24 hours before onset of symptoms. The patient should be treated with
A) antibiotics.
B) toxin.
C) surgery.
D) vaccination.
E) supportive care, including respiratory assistance.
E
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Which of the following statements about blood
cells in solutions is CORRECT?
a. A blood cell placed in an isotonic solution will swell. b. A blood cell placed in a hypotonic solution will swell. c. A blood cell placed in a hypotonic solution will shrink. d. A blood cell placed in an isotonic solution will shrink. e. A cell placed in a hypotonic solution will remain the same size.
Calcium levels in the body are maintained by hormones. If the blood calcium level rises above a set point, calcitonin is secreted by the thyroid gland and sets into motion responses to lower the blood calcium back to the set point
If the blood calcium level falls below a set point, the parathyroid gland secretes parathyroid hormone that sets into motion responses to raise the blood calcium. These homeostatic responses are examples of A) positive feedback. B) effectors. C) sensors. D) negative feedback.
Earth has supported life for approximately
A. 20 billion years. B. 3.8 - 3.7 billion years. C. 1.5 billion years. D. 700 - 800 million years.
What can act as a vector to introduce new genes into a cell?
A) primers B) ligase C) restriction enzymes D) plasmids