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Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
4th Edition
ISBN: 9781319154639
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Question
Chapter 3, Problem 9SA
Summary Introduction
To review:
What is meant by ‘essential amino acid’.
Introduction:
Amino acids are the simplest unit of proteins and they are obtained from the diet.
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Students have asked these similar questions
Identify the polar amino acids, the aromatic amino acids,and the sulfur-containing amino acids, given a peptide with thefollowing amino acid sequence:Val-Met-Ser-Ile-Phe-Arg-Cys-Tyr-Leu
Are amino acids other than the usual 20 amino acidsfound in proteins? If so, how are such amino acids incorporatedinto proteins? Give an example of such an amino acid and a protein in which it occurs.
Why are L-amino acids prevalent/common in biological systems?
Chapter 3 Solutions
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- n each of the following two groups of aminoacids, which amino acid would be the easiest to distinguish fromthe other two amino acids in the group, based on a titration?(a) gly, leu, lys(b) glu, asp, serarrow_forwardTranslate the following amino acid sequence into one-letter code: Glu-Leu-Val-Ile-Ser-IleSer-Leu-IleVal-Ile-Asn-Gly-Ile-Asn-Leu-Ala-SerValGlu-Gly-Ala-Serarrow_forwardDraw a peptide from the given amino acids Phe-Cys-Ala-Arg-Ala-Ser-Tyr. Try to cleave this oligopeptide while it is travelling through your digestion tract. Can someone please explain the question for me and how to draw a peptide?arrow_forward
- How many amino acid residues are there?arrow_forwardWhich of the following amino acids would you expect to find more often near the center of a folded globular protein? Which ones would you expect to find more often exposed to the outside? explain your answers. Ser, Ser-p (a Ser residue that is phosphorylated), Leu, Lys, Gln, His, Phe, Val, Ile, Met, Cys–S–S–Cys (two cysteines that are disulfide- bonded), and Glu. Where would you expect to find the most N-terminal amino acid and the most C-terminal amino acid?arrow_forwardIdentify the nonpolar amino acids and the acidic aminoacids in the following peptide:Glu-Thr-Val-Asp-Ile-Ser-Alaarrow_forward
- Which of the following amino acids would most likely exhibit hydrophobic interaction with isoleucine? Oserine Omethionine Oglutamate threonine arginine Previous Marrow_forwardWhich three classes of amino acids would you most likely find lining the surface of a globular protein?arrow_forwardIdentify the amino acid shown below. (Note: single letter code is provided as answer) H H₂N-C-COOH CH₂ CH₂ CH₂ Эс Ow COM OFarrow_forward
- What is the 1-letter code for the amino acid glutamine? N E Q Garrow_forwardAmino acids project from each polypeptide backbone in a β-sheet in an alternating fashion (oneabove the plane and the next below the plane – see Fig 3.8B). Consider the following proteinsequence: Leu-Lys-Val-Asp-Ile-Ser-Leu-Arg-Leu-Lys-Ile-Arg-Phe-Glu.a. Is there a pattern to these amino acids? If so, what is it? b. What does this sequence of amino acids mean for the hydrophobicity/hydrophilicity of theresulting β-sheet? c. Can you make a prediction about how the β-sheet will be arranged in higher levels of protein structure? If so, what prediction would you make?arrow_forwardAn amino acids unique property arises through which component? How does this same component contribute to the overall chemical nature of the protein?arrow_forward
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