Concept explainers
Which is not a
a. adenine | c. glutamine | e. cytosine |
b. guanine | d. thymine | f. All are in DNA. |
Introduction:
DNA is a polymer of nucleotides. Each nucleotide consists of a deoxyribose sugar, three phosphate groups, and a nitrogen-containing base.
Answer to Problem 1SA
Correct answer:
Glutamine is not a nucleotide base in DNA. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Option c. is given as “glutamine.”
The four nitrogen bases of DNA are adenine, thymine, cytosine, and guanine. Glutamine is one of the
Reason for incorrect answer:
Option a. is given as, “adenine.”
Adenine is one of the two purine bases that form the nucleotides of DNA. Glutamine is classified under the category of amino acids. Hence, option a. is incorrect.
Option b. is given as, “guanine.”
Guanine is a nitrogenous base that belongs to the purine group. Glutamine is absent in the double-stranded DNA structure. Hence, option b. is incorrect.
Option d. is given as, “thymine.”
Thymine belongs to the pyrimidine group of nitrogen bases of DNA. Glutamine does not belong to the category of pyrimidines. Hence, option d. is incorrect.
Option e. is given as, “cytosine.”
Cytosine is a pyrimidine base in the nucleotides of DNA. Glutamine does not belong to the category of either purines or pyrimidines. Hence, option e. is incorrect.
Option f. is given as, “All are in DNA.”
Adenine, thymine, cytosine, and guanine are the four nitrogenous bases present in the double-helical structure of DNA. However, glutamine does not belong to the category of nitrogenous bases present in the DNA molecule. Hence, option f. is incorrect.
Hence, the options a., b., d., e., and f. are incorrect.
The four nitrogen bases of DNA are adenine, thymine, cytosine, and guanine. Glutamine is an amino acid and is absent in DNA bases. Thus, the correct answer is option c.
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Chapter 8 Solutions
EBK BIOLOGY: CONCEPTS AND APPLICATIONS
- What amino acid residue interacts with molecular oxygen (O2) in hemoglobin? a. Phenylalanine b. Serine c. Valine d. Histidinearrow_forwardWhich of the following are nucleotide base pairs found in DNA? Select all that apply. A. Adenine and thymine B. Cytosine and adenine C. Thymine and guanine D. Guanine and cytosinearrow_forwardWhich statement about DNA bases is true? A. Adenine and guanine are purines. B. Thymine and adenine are pyrimidines. C. Guanine and cytosine are pyrimidines. D. Guanine and cytosine are purines. E. None are correctarrow_forward
- What provides the negative charge associated with DNA? a. sulfhydryl groups b. nitrogenous bases c. phosphate groups d. deoxyribose's hydroxyl groups e. ribose's hydroxyl groupsarrow_forwardWhich of the following is not a nucleotide? a. adenosine triphosphate b. adenosine diphosphate c. adenine d. cytosine e. arabinosearrow_forwardWhich of the following statements about DNA is true? (Select all that applied) Select one: a. DNA contains thymine but not uracil. b. DNA molecules contain deoxyribose. c. All of these d. In a double-stranded DNA molecule, adenine on one strand will be connected to thymine on the complementary strand by two hydrogen bonds.arrow_forward
- A molecule of RNA has 400 nucleotides and 110 guanines. How many adenines does it have? A.110 B.0 C.90 D.400 E.180arrow_forwardWhat components make up a single nucleotide of DNA? Select all that apply. A. Ribose sugar B. Three phosphate groups C. Nitrogen containing base D. Deoxyribose sugararrow_forwardChoose the combination of answers that most accurately completes the statement. A nucleotide contains which of the following? a. 5-carbon sugar d. b and c only b. nitrogen base e. all of these c. phosphatearrow_forward
- Which of the following is not a difference between DNA and RNA? a. DNA contains thymine whereas RNA contains uracil b. DNA contains deoxyribose and RNA contains ribose c. DNA contains alternating sugar-phosphate molecules whereas RNA does not contain sugars d. RNA is single stranded and DNA is double strandedarrow_forwardWhich amino acid sidechain can readily donate or accept a proton at near physiological pH? a. Proline b. Lysine c.Tyrosine d.Histidinearrow_forwardThe type of bonds between the nucleotide bases of the two strands of DNA are a.polar covalent bonds. b.nonpolar covalent bonds. c.hydrogen bonds. d.ionic bonds.arrow_forward