Organic Chemistry, 12e Study Guide/Student Solutions Manual
12th Edition
ISBN: 9781119077329
Author: T. W. Graham Solomons, Craig B. Fryhle, Scott A. Snyder
Publisher: WILEY
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Textbook Question
Chapter 25, Problem 6PP
Practice Problem 25.6
(a) There are approximately 3 billion base pairs in the DNA of a single human cell. Assuming that this DNA exists as a double helix, calculate the length of all the DNA contained in a human cell.
(b) The weight of DNA in a single human cell is
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Draw the structures of the nucleosides formed from each of the following components: (a) ribose + uracil; (b) 2- deoxyribose + guanine.
In relation to the spatial structure of the proteins select the INCORRECT alternative:
(a) The quaternary structure of proteins consists of the association of two or more protein chains to form the complete protein.
(b) The tertiary structure of proteins is mainly due to long-range interactions between amino acids that are far apart in the protein sequence but spatially close due to protein coiling.
(c) Disulfide bridges are produced or broken as a result of oxidation-reduction processes.
(d) The interactions between peptide chains in the secondary structure of proteins are basically due to Van der Waals forces.
(e) The primary structure of proteins is basically due to the existence of covalent bonds between the different amino acids that constitute them.
Erwin Chargaff’s discovery that DNA contains equimolar amounts of guanine and cytosine and also equimolar amounts ofadenine and thymine has come to be known as Chargaff’s rule:G = C and A = T(a) Does Chargaff’s rule imply that equal amounts of guanine and adenine are present in DNA? That is, does G = A?(b) Does Chargaff’s rule imply that the sum of the purine residues equals the sum of the pyrimidine residues? That is,does A + G = C + T?(c) Does Chargaff’s rule apply only to double-stranded DNA, or would it also apply to each individual strand if thedouble helical strand were separated into its two complementary strands?
Chapter 25 Solutions
Organic Chemistry, 12e Study Guide/Student Solutions Manual
Ch. 25 - Prob. 1PPCh. 25 - Prob. 2PPCh. 25 - Prob. 3PPCh. 25 - Prob. 4PPCh. 25 - Prob. 5PPCh. 25 - Practice Problem 25.6 (a) There are approximately...Ch. 25 - Prob. 7PPCh. 25 - Prob. 8PPCh. 25 - Prob. 9PPCh. 25 - Practice Problem 25.10
The sense strand of a...
Ch. 25 - Practice Problem 25.11
(a) Using the first codon...Ch. 25 - Write the structure of the RNA dinucleotide GC in...Ch. 25 - 25.13 Write the structure of the DNA dinucleotide...Ch. 25 - The example of a silylHilbertJohnson...Ch. 25 - Prob. 15PCh. 25 - Prob. 16PCh. 25 - Research suggests that expression of certain genes...
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- 22-62 Distinguish between intermolecular and intramolecular hydrogen bonding between backbone groups. Where in protein structures do you find one, and where do you find the other?arrow_forwardMust the ratio of guanine to cytosine be 1:1 in RNA? Explain.arrow_forwardThe base composition for one of the strands of a DNA double helix is 19% A, 34% C, 28% G, and 19% T. What is the percent base composition for the other strand of the DNA double helix?arrow_forward
- 22-84 How many different dipeptides can be made (a) using only alanine, tryptophan, glutamic acid, and arginine and (b) using all 20 amino acids?arrow_forward22-20 Show how alanine, in solution at its isoelectric point, acts as a buffer (write equations to show why the pH does not change much if we add an acid or a base).arrow_forward22-49 Based on your knowledge of the chemical properties of amino acid side chains, suggest a substitution for leucine in the primary structure of a protein that would probably not change the character of the protein very much.arrow_forward
- 22-53 Do iron and zinc ions play role in protein structure? If so, what is the role for either or both?arrow_forward22-85 Denaturation is usually associated with transitions from helical structures to random coils. If an imaginary process were to transform the keratin in your hair from an (-helix to a (-pleated sheet structure, would you call the process denaturation? Explain.arrow_forwardUsing the single letter abbreviations A, V, and L, as given in Table 22-1, list the tripeptides formed if alanine, valine, and leucine are all mixed together and peptide bonds are allowed to form in all possible combinations.arrow_forward
- The relative molecular masses of the two amino acids other than glycine in glutathione are 121.0 g mol and 147.0 g mol1. Using the information provided above, determine the molar mass of the tripeptide.arrow_forwardin nucleic acid, monomers are held together by which linkage?arrow_forward(a) What is the empirical formula of cellulose? (b) Whatis the monomer that forms the basis of the cellulose polymer?(c) What bond connects the monomer units in cellulose:amide, acid, ether, ester, or alcohol?arrow_forward
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