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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
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
- Which 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_forwardWhat 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 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
- Which of the following is not a nucleotide? a. adenosine triphosphate b. adenosine diphosphate c. adenine d. cytosine e. arabinosearrow_forwardIf one of the strands in DNA is made up of 10% guanine, what will be the composition of the DNA? A. 10% C B. 40% U C. 10% C in its complementary strand D. 40% A + T O E. cannot be determinedarrow_forwardWhich amino acid sidechain can readily donate or accept a proton at near physiological pH? a. Proline b. Lysine c.Tyrosine d.Histidinearrow_forward
- The 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_forwardCystic Fibrosis is caused by which of the following? a. Replacement of three nucleotides with a new three nucleotide sequence b. Addition of three nucleotides c. Deletion of three nucleotidesarrow_forwardWhich statement best describes the structure of a DNA molecule A. DNA is single-stranded and straight molecule B. DNA is a double-stranded molecule that looks like a spiral staircase C. DNA is a double stranded molecule that is straight like a ladder D. DNA is a single-stranded and curly moleculearrow_forward
- A new type of nucleic acid molecule is found have a base composition of 29% adenine, 19% thymine, 21% cytosine and 31% guanine. The molecule is probably: a. single stranded DNA b. double stranded RNA c. double stranded DNA d. single stranded RNAarrow_forwardWhat is the genetic information in DNA due to? A. composition of DNA in a gene B. specificity of base pairing C. sequence of nucleotides D. sugar-phosphate backbone E. precise three-dimensional conformation of DNAarrow_forwardThe energy to form the phosphodiester bond between nucleotides in a single strand comes from A, the nucleotides in Triphosphate form B. only from ATP C. The single Phosphate of nucleotides D. GTP provides the energyarrow_forward
