What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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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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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
Whats the Difference between Amino acids and imino acids?
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, ser
Chapter 3 Solutions
What Is Life? A Guide to Biology with Physiology
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- Why are L-amino acids prevalent/common in biological systems?arrow_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_forwardIdentify the nonpolar amino acids and the acidic aminoacids in the following peptide:Glu-Thr-Val-Asp-Ile-Ser-Alaarrow_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_forward
- Identify the amino acid shown below. (Note: single letter code is provided as answer) H H₂N-C-COOH CH₂ CH₂ CH₂ Эс Ow COM OFarrow_forwardWhich three classes of amino acids would you most likely find lining the surface of a globular protein?arrow_forwardWhich of the following amino acids would most likely exhibit hydrophobic interaction with isoleucine? Oserine Omethionine Oglutamate threonine arginine Previous Marrow_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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