Unstable isotopes can be useful
A) catalysts.
B) in medical diagnosis.
C) in vitamins.
D) in the formation of hydrogen bonds.
E) as buffers.
B
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Changing a single amino acid in a protein consisting of 325 amino acids would _____
A) alter the primary structure of the protein but not its tertiary structure or function B) cause the tertiary structure of the protein to unfold C) always alter the biological activity or function of the protein D) always alter the secondary structure of the protein and disrupt its biological activity E) always alter the primary structure of the protein, sometimes alter the tertiary structure of the protein, and sometimes affect its biological activity
The most certified Fair Trade product in the United States is
A) coffee. B) bananas. C) tea. D) chocolate. E) chicken.
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds are most visually sensitive to the color red. Hummingbird flowers are pollinated by hummingbirds. Which of the following features of these flowers would indicate they have coevolved with hummingbirds? (Check all that apply)
_____ long tubular flowers _____ flowers are colored violet and blue _____ blooming time of the flowers coincides with the arrival of the hummingbirds _____ flowers produce a high volume of nectar and sugar _____ flowers are low to the ground Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about coevolution? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which statement is true?
a. A cell placed in an isotonic solution will swell. b. A cell placed in a hypotonic solution will swell. c. A cell placed in a hypotonic solution will shrink. d. A cell placed in a hypertonic solution will remain the same size. e. A cell placed in a hypotonic solution will remain the same size.