The condensation reaction that forms nucleic acid polymers occurs between a _____ group on one nucleotide and a _____ group on a second nucleotide.
A) nitrogenous base, nitrogenous base
B) phosphate, hydroxyl
C) carbon, carbon
D) nitrogenous base, sugar
Ans: B) phosphate, hydroxyl
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A dehydrated runner drinks a lot of water after a race. They rehydrate because
A. the stomach is hypotonic compared to the bloodstream. B. the bloodstream is hypotonic compared to the stomach. C. the stomach and bloodstream are isotonic compared to each other. D. water will diffuse from a low to high concentration. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about osmosis? What other information is related to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect 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. Chromatin remodeling changes the order of genes between histones. b. Chromatin remodeling becomes permanent when inherited. c. DNA methylation and chromatin remodeling can cause cancer. d. DNA methylation and chromatin remodeling are independent processes.
Scientists have identified approximately ________ million species of organisms, but millions more are thought to exist
Fill in the blank(s) with correct word
Which of the following populations would have the highest population growth rate?
A. a population with a high natality and a high mortality B. a population with very few old animals in it and a large number of young animals C. a population in which 65% of the animals are males D. a population with low natality and high mortality