Which is not correct about water molecules?
A. Hydrogen bonds exist between water molecules.
B. Hydrogen bonds are weak bonds.
C. Covalent bonds exist within a water molecule.
D. Water is a polar molecule.
E. Hydrogen is more electronegative than oxygen.
Answer: E
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How has climate change altered the mountain pine beetle?
A) They are being outcompeted by the prairie pine beetle. B) They now have two generations per year. C) They have decreased the average elevation of their distribution. D) Their abundance has increased through lack of predators due to mismatched phenology.
A(n) ________ is a group of three bases on tRNA that is complementary to a specific mRNA codon.
A. poly-A tail B. anticodon C. codon D. cap
Contact dermatitis involves
A. T lymphocytes secreting inflammatory cytokines. B. an allergen entering the skin. C. a sensitizing and provocative dose. D. the production of itchy papules and blisters. E. All of the choices are correct.
Which of the following is incorrectly paired with its result?
A. increase in filtration pressure - increase urine volume B. decrease in concentration of plasma proteins - decrease in filtration pressure C. decrease in concentration of plasma proteins - increase in urine volume D. decreased sympathetic stimulation - increase in urine volume E. increased sympathetic stimulation - decrease filtration pressure