Which of the following examples describes a unique functional property of the carboxyl group?
A. Its compounds may be structural isomers with different properties.
B. Two groups can interact to help stabilize protein structure.
C. It is polar as a result of the electronegative oxygen atom drawing electrons toward itself.
D. The covalent bond between oxygen and hydrogen is so polar that hydrogen ions tend to dissociate reversibly.
E. It acts as a base.
Answer: D. The covalent bond between oxygen and hydrogen is so polar that hydrogen ions tend to dissociate reversibly.
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A Punnett square displays
A) members of a family and their phenotypes. B) paired chromosomes in size order. C) DNA sequences and the proteins they encode. D) the probabilities of how alleles combine in offsprings.
Nitrogen-fixing bacteria convert atmospheric N2 into
A. methane. B. nitrates. C. nitrites. D. ammonium. E. carbon dioxide.
Assume that you want to use radiometric dating to determine the age of a particular layer of rock. You are measuring the decay of radioactive potassium with a half-life of 1.25 billion years. How long would it take 75% of the radioactive potassium to break down?
a. 2.5 billion years b. 5.0 billion years c. 5,730 years d. 0.625 billion years
Imagine that you are trying to make a homemade salad dressing and place several drops of olive oil into a container of water. You stir the solution, but the oil doesn't readily mix
Instead, you observe a glistening clump of oil floating on the surface. Explain what is happening at the molecular level. (Your answer should include the term hydrophobic.)