One example of a vaccine made from weakened toxin protects against
a. pertusis.
b. polio.
c. German measles.
d. measles.
e. tetanus.
E
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In humans, helminths generally infect the ________.
A. nervous system B. urinary tract C. gastrointestinal tract D. skin E. muscular system
Which of the following molecules does NOT have a
total of three carbon atoms? a. PEP b. PGAL c. fructose-1,6-biphosphate d. pyruvate e. phosphoglycerate (PGA)
Which of the following statements about the human genome is INCORRECT?
A) There are approximately 3.1 billion bp in the human genome. B) Human share a majority of genes with other species. C) Less than 2 percent of the genome codes for proteins. D) The human genome contains approximately 100,000 genes. E) The functions of most human genes are still unknown.
The adrenal medulla produces hormones in response to
A) stress or exercise. B) light. C) signals from the posterior pituitary. D) reduced blood levels of thyroxine. E) signals from the anterior pituitary.