After an oil spill, bacteria that can metabolize hydrocarbons are released for bioremediation. After a month, two areas affected by the spill show different levels of improvement. Which factor should be measured to determine the difference in effectiveness between the two sites?
A. Nutrient levels
B. pH
C. Salinity
D. Oxygen levels
E. Temperature
F. All of these factors may play a role.
Answer: F
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Which of the following statements is false?
A. Excretion of urea requires less water than excretion of uric acid. B. Urea is produced in the liver and eliminated in the kidneys. C. Uric acid can be stored at a higher concentration in tissues than urea. D. Ammonia is lethal to cells at high concentrations. E. Excretion of ammonia requires high volumes of water in the surrounding environment.
A treatment for bacterial infections from the early 20th century has made a comeback; the use of bacterial viruses to eliminate bacterial infections. Which explanation most accurately describes the mechanism of action behind this treatment?
A. Viruses can infect bacteria, transferring pathogenic genes. The viral genes can then be suppressed, causing the bacteria to not replicate viruses. B. The attachment structures on the virus and the receptors on the host cells make for exquisite specificity of viruses for particular bacterial species. C. Antibiotic resistance in humans is on the increase, so using a different kind of therapy is more beneficial. D. A wide variety of bacteria cause a large percentage of human infections, producing much sickness and death.
Cystic fibrosis is a pleiotropic disease
Indicate whether the statement is true or false
A lichen is made up of which two types of organisms?
A. a fungus and a nonvascular plant species B. a fungus and an algal species C. an alga and a vascular plant species D. an alga and a nonvascular plant species E. a fungus and either an algal or bacterial species