Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 1, Problem 1.11QAP
Interpretation Introduction
(a)
Interpretation:
A standard-addition plot should be created using the data given.
Concept introduction:
A commonform of standard-addition method involves adding known amounts of a standard solution to sample aliquots containing a fixed volume. Measurements taken for each solution can be used to plot a standard-addition plot.
Interpretation Introduction
(b)
Interpretation:
Using the standard-addition plot constructed, the concentration of the unknown phenobarbital sample should be determined.
Concept introduction:
In a standard-addition plot, the graph can be extrapolated to obtain thevolume of standard reagentequivalent to the amount of analyte in the sample (
Where,
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Answer F please
4. Refer to the data below to answer the following questions:
The octapeptide saralasin is a specific antagonist of angiotensin II. A derivative of saralasin is used
therapeutically as an antihypertensive. Amino acid analysis of saralasin show the presence of the
following amino acids:
Ala, Arg, His, Pro, Sar, Tyr, Val, Val
A.Sar is the abbreviation for sarcosine, N-methyl aminoethanoic acid. Draw the structure of sarcosine.
B. N-Terminal analysis by the Edman method shows saralasin contains sarcosine at the N-terminus.
Partial hydrolysis of saralasin with dilute hydrochloric acid yields the following fragments:
Tyr-Val-His
Sar-Arg-Val
His-Pro-Ala
Val-Tyr-Val
Arg-Val-Tyr
What is the structure of saralasin?
What is the structure of the DNA backbone?
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- PLEASE PLEASE PLEASE use hand drawn structures when possarrow_forward. M 1- MATCH each of the following terms to a structure from the list below. There is only one correct structure for each term and structures may be used more than once. Place the letter of the structure in the blank to the left of the corresponding term. A. Sanger dideoxy method C. Watson-Crick B. GAUCGUAAA D. translation E. HOH2C OH OH G. transcription I. AUGGCUGAG 0 K. OPOH2C 0- OH N- H NH2 F. -OPOH2C 0- OH OH H. Maxam-Gilbert method J. replication N L. HOH2C a. b. C. d. e. f. g. B M. AGATCGCTC a pyrimidine nucleoside RNA base sequence with guanine at the 3' end. DNA base sequence with cytosine at the 3' end. a purine nucleoside DNA sequencing method for the human genome 2'-deoxyadenosine 5'-phosphate process by which mRNA directs protein synthesis OH NH2arrow_forwardPlease use hand drawn structures when neededarrow_forward
- B. Classify the following amino acid. Atoms other than carbon and hydrogen are labeled. a. acidic b. basic C. neutral C. Consider the following image. Which level of protein structure is shown here? a. primary b. secondary c. tertiary d. quaternary D. Consider the following image. H RH H HR H R HR HR RH Which level of protein structure is shown in the box? a. primary b. secondary R c. tertiary d. quaternary コー Rarrow_forwardBriefly answer three from the followings: a. What are the four structures of the protein? b. Why is the side chain (R) attached to the alpha carbon in the amino acids is important for the function? c. What are the types of amino acids? And how is it depend on the (R) structure? d. Write a reaction to prepare an amino acid. prodarrow_forwardAnswe Answer A and B pleasearrow_forward
- 3. Refer to the data below to answer the following questions: Isoelectric point Amino Acid Arginine 10.76 Glutamic Acid 3.22 Tryptophan 5.89 A. Define isoelectric point. B. The most basic amino acid is C. The most acidic amino acid is sidizo zoarrow_forward3. A gas mixture contains 50 mol% H2 and 50 mol% He. 1.00-L samples of this gas mixture are mixed with variable volumes of O2 (at 0 °C and 1 atm). A spark is introduced to allow the mixture to undergo complete combustion. The final volume is measured at 0 °C and 1 atm. Which graph best depicts the final volume as a function of the volume of added O2? (A) 2.00 1.75 Final Volume, L 1.50 1.25 1.00 0.75 0.50 0.25 0.00 0.00 0.25 0.50 2.00 (B) 1.75 1.50 Final Volume, L 1.25 1.00 0.75 0.50- 0.25 0.00 0.75 1.00 0.00 0.25 Volume O₂ added, L 2 0.50 0.75 1.00 Volume O₂ added, L 2 2.00 2.00 (C) (D) 1.75 1.75 1.50 1.50 Final Volume, L 1.25 1.00 0.75 0.50 Final Volume, L 1.25 1.00 0.75 0.50 0.25 0.25 0.00 0.00 0.00 0.25 0.50 0.75 1.00 0.00 0.25 Volume O₂ added, L 0.50 0.75 1.00 Volume O₂ added, L 2arrow_forwardLeucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pai 2.36 and pKa2 = 9.60. H2N-C(R)H-COOH and R is -CH2-CH(CH3)2 A. Draw the condensed structure for leucine, and label all chirality centers with an asterisk. B. How many possible stereoisomers of leucine are there? C. Draw a Fischer projection of L-leucine and label the chirality center(s) as R or S. D. What is the p/ of leucine? E. Draw the structure of the predominant form of leucine at 10.00. F. Draw the structure of the predominant form of leucine at pH = 1.50. G. Leucine is described as an essential amino acid. What does this mean? H. Show the alkyl halide you would use to prepare leucine by the amidomalonate method. =arrow_forward
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