Which of the following autoimmune diseases can potentially be avoided by preventing or completely curing a Streptococcus infection?
A. HIV
B. Systemic lupus
C. Rheumatoid arthritis
D. Rheumatic fever
Answer: D
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You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?
A) It is triploblastic. B) It has bilateral symmetry. C) It possesses sensory structures at its anterior end. D) Muscular activity of its digestive system distorts the body wall.
Impaired vision after a blow to the head implies damage to the vision processing center in the brain. Which region of the brain controls vision?
A. frontal lobe B. parietal lobe C. temporal lobe D. occipital lobe E. brainstem
A molecular biologist treats a 600-bp length of linear DNA with HindIII restriction endonuclease. Following gel electrophoresis, the biologist observes that there is only one band on the gel and it corresponds with the migration distance of the 200-bp molecular weight marker. Assuming that no procedural errors were made, what can be concluded from these results?
A. Three HindIII recognition sequences were present in the original DNA. B. One HindIII recognition sequence was present in the original DNA. C. There were no HindIII recognition sequences present in the original DNA. D. Two HindIII recognition sequences were present in the original DNA.
Which of the following is not an unsustainable practice of society?
A. using large amounts of fossil fuels, fertilizers, and pesticides B. reduction in population growth rate C. using more freshwater resources for agriculture than in homes D. deforestation and desertification E. eating more meat than vegetables