Question 48 The structural backbone that all nucleic acids consist of isaltering molecules of: a nitrogenous base and phosphate a sugar and an ether a sugar and nitrogenous base a sugar and a phosphate
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Step 1: Recognize that nucleic acids (DNA and RNA) are polymers made from repeating units called nucleotides. Show more…
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Which of the following correctly describe the "backbone" of a strand of DNA? a) The backbone is made of alternating sugar and phosphate molecules. b) The backbone consists of repeating nitrogenous bases. c) The backbone consists only of phosphate molecules. d) The backbone is made of repeating sugar molecules.
Asma V.
Nucleic acids have definite polarity, or directionality. Stated another way, one end of the molecule is different from the other end. How are these ends described? A. One end has a hydroxyl group on the 2 carbon; the other end has a hydrogen atom on the 2 carbons. B. One end contains a nitrogenous base; the other end lacks it. C. One end has an unlinked 3' hydroxyl; the other end has an unlinked 5' phosphate. D. One end has one phosphate group; the other end has two phosphate groups.
Dominador T.
8. (5 pts). Nucleic acids are built from the complex building blocks - nucleotides. Consider the structure of a nucleotide. (a) Arrange a nitrogenous base, pentose sugar, and phosphate based on their relative hydrophobicity (from the least to the most hydrophobic). Explain your answer. (b) Describe the strands' orientation in the secondary structure of DNA and interactions that stabilize the structure. How does the secondary structure of DNA accommodates the differential hydrophobicity of the key elements of nucleotides?
Sri K.
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