Which of the following is/are true about the two DNA strands that form a helix? (check all that apply) Select one or more: a.The 2 strands are antiparallel and complementary to each other b.The 2 strands are linked to each other by phosphodiester bonds c.The phosphate groups of nucleotides impart a negative charge to nucleic acids

Which of the following is/are true about the two DNA strands that form a helix? (check all that apply) Select one or more: a.The 2 strands are antiparallel and complementary to each other b.The 2 strands are linked to each other by phosphodiester bonds c.The phosphate groups of nucleotides impart a negative charge to nucleic acids

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter8: Dna Structure And Function

Section: Chapter Questions

Problem 1SA: Which is not a nucleotide base in DNA? a. adenine c. glutamine e. cytosine b. guanine d. thymine f....

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Which is not a nucleotide base in DNA? a. adenine c. glutamine e. cytosine b. guanine d. thymine f. All are in DNA.
Describe the structure and complementary base pairing of DNA.
Which of the following statements is (are) true? (a) The two strands of DNA run parallel from their 5' to their 3' ends. (b) An adenine–thymine base pair contains three hydrogen bonds. (c) Positively charged counterions are associated with DNA. (d) DNA base pairs are always perpendicular to the helix axis
Which of the following statement for the B-DNA helix is NOT true? a. It is a left-handed helix. b. Planes of bases are nearly perpendicular to the helix axis. c. Sugars are in the 2’-endo conformation. d. Bases are in the anti conformation. e. It is a common form of duplex DNA solution.
Which of the following is NOT a characteristic of the DNA Double Helix? a) The two strands run in an anti-parallel fashion based on their polarity. b) Hydrogen bonding between nucleotides holds the strands together. c) DNA is 20 Angstrom's wide. d) The percentage of Guanine and Thymine present in a double helix strand are always equal.
The helix of an A-DNA differs from the helix of a B-DNA in all of the following EXCEPT which phrase? a. polarity of the strands b. thickness of the helix c. tilt of the bases d. appearance of the major and minor groove
What is the best description of how the two strands are aligned with each other in the double helix of DNA? A) parallel B) anti-parallel C) perpendicular D) cross-linked E) obtuse
Which of the following statements about nucleic acids is not correct? Select one: A. In DNA the distance between the strands of the double helix is relatively constant. B. The growing DNA polymer is synthesized in the 5' to 3' direction. C. The enzymes that catalyze DNA synthesis are known as DNA polymerases. D. RNA strands are synthesized in the 3' to 5' direction. E. Unlike DNA, RNA is easily cleaved because the 2'-OH group of the ribose is a nucleophile that catalyzes hydrolysis of the strand.
What is the structure of a DNA molecule? A. Two nucleotide strands coiled into a double helix held together by bonds between internal nucleotide bases B. Three nucleotide strands coiled into a triple helix held together by bonds between internal nucleotide bases C. Two nucleotide strands coiled into a double helix held together by bonds between external nucleotide bases D. A single nucleotide strand held together by bonds between internal nucleotide bases
On a single-stranded DNA, the basic units are linked to one another by _______ A. Disulfide linkages B. Phosphoanhydride bonds C. Phosphodiester bonds D. Hydrogen bonds E. Hydrophobic interactions
Which of the following features of DNA is required for it to behave as a self-replicating molecule? A) A sugar phosphate backbone B) Complementary base pairing C) arrangement as double helix D) Phosphodiester bonds E) All of the above
Which of the following is true about the structure of DNA as proposed by Watson and Crick (B-form DNA)? A. DNA forms a left-handed double helix. B. The strands of DNA are parallel. C. The complementary base pairs are held together by hydrogen bonds. D. A complete turn of the double helix occurs after every base pair.