Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 3, Problem 7TYU

Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?

  1. A.    The two strands of the double helix would separate.
  2. B.     The phosphodiester linkages of the polynucleotide backbone would be broken.
  3. C.     The pyrimidines would be separated from the deoxyribose sugars.
  4. D.    AU bases would be separated from the deoxyribose sugars.
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Which statement about nonpolar interactions in the formation of the DNA double helix is INCORRECT? A. Van der Waals interactions are nearly optimal in a double-helical structure.   B. Nonpolar surfaces of the bases are moved into contact with each other due to a more complete base stacking.   C. Nucleotide bases tend to stack even in single-stranded DNA molecules. D. The separation distance of the planes of adjacent bases needs to be adjusted for the favorable van der Waals contacts.   E. Surface complementary maximizes the formation of hydrogen bonds and van der Waals interactions while minimizing the nonpolar surface area exposed to the aqueous environment.
In the dideoxy-sequencing reaction, what terminates DNA synthesis at a particular base? a. The absence of a base on the ddNTP halts the DNA polymerase. b. The ddNTP causes a break in the sugar–phosphate backbone. c. DNA polymerase will not incorporate a ddNTP into the growing DNA strand. d. The absence of a 3′-OH group on the ddNTP prevents the addition of another nucleotide.
How are nucleotides connected to each other in a single strand of DNA?   A. The nitrogenous bases and acids link the separate nucleotides into a chain.   B. The phosphate group of one nucleotide binds to the sugar on the next nucleotide.   C. The hydroxy group of one nucleotide stabilizes the phosphate group of the adjacent nucleotide.   D. The sugar of one nucleotide binds directly to the sugar of the adjacent nucleotide.

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Campbell Biology in Focus (2nd Edition)

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