The bacterium Agrobacterium tumefaciens
a. forms a nitrogen-fixing symbiosis with plants.
b. forms a symbiotic relationship with plant roots.
c. causes plant wilt.
d. causes crown gall disease.
Answer: D
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Diseases that are good candidates for eradication have
A) only a human reservoir. B) no asymptomatic phase. C) an environmental reservoir. D) only a human reservoir and no asymptomatic phase.
Which of the following is true of anorexia
nervosa?
a. it is caused by environmental and genetic factors combined b. bones are weakened from loss of calcium c. iron- deficiency anemia is common d. hear muscle is weakened e. all of these are true of anorexia nervosa
Is the average ecological footprint getting larger or smaller globally? What will be an ideal response?
Which of the following are functions of the stomach?
A) digestion of proteins B) control movement of food into the small intestine C) storage of food D) absorption of protein and carbohydrates