Which of the following may be found in blood plasma?
A) water and proteins B) water, proteins, nutrients, and ions
C) water, proteins, and ions D) water
Answer: B
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Most of the ultraviolet radiation reaching the upper atmosphere is absorbed by
A. CFCs. B. ozone. C. nitrogen. D. carbon dioxide. E. water vapor.
Pregnant women are advised to avoid eating tuna, due to the presence of ____, which can impact prenatal brain
development.
a. copper b. mercury c. nicotine d. bisphenol-A (BPA) e. fluoride
A potent neurotoxin that causes paralytic shellfish poisoning in coastal temperate North America is produced by ________.
A. diatoms B. green algae C. dinoflagellates D. red algae
Suppose you are testing a treatment for AIDS patients and find that 75% respond well, whereas 25% show no improvement or a decline in health. You should
A) conclude that only 75% of AIDS patients should be treated. B) begin work on developing a new drug. C) conclude that you have proven the effectiveness of the drug. D) review the results, modify the drug or the dosage, and repeat the experiment. E) discontinue experimentation with this treatment because 25% of patients did not improve.