Concept explainers
Interpretation:
Amino acid that is hydrophobic has to be identified and explained.
Concept introduction:
Many amino acids are linked together through amide bonds to form a biologically large molecule known to be proteins.
Amino acid had both amino
Amino functional group is
The amino acids that are neutral are further classified into polar and non-polar.
The side chain are classified into hydrophobic (water hating) and hydrophilic (water loving).
Hydrophilic (water-loving):
The compound has the polar group such as hydroxyl group (
Hydrophobic (water-fearing):
The compound has non polar group such as alkyl chain and benzene ring is called as hydrophilic.
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Check out a sample textbook solutionChapter 18 Solutions
Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
- This amino acid is: (Note that the non-ionized form is shown; remember that backbone groups are irrelevant to classification) a) Polarized (+) charged b) Nonpolar c) Polar and (-) charged d) Polar unchargedarrow_forward1. (a) Draw a circle around one amino acid in the structure. (b) Draw a box around one amino acid side chain. (c) Indicate whether the side chain you chose is hydrophobic or hydrophilic. (d) Draw an arrow pointing to a peptide bond 2. If the peptide segment shown above was part of a beta sheet, which of its functional groups would be involved in forming and stabilizing the beta sheet? 3. Which amino acid (also called amino acid residue)would be more likely to occur on the surface of a protein: an aspartate residue or a methionine residue? Explain your choice.arrow_forwardValine is an amino acid with a nonpolar side chain and serine is one with a polar side chain. Draw the two amino acids.(a) Why is the side chain for valine nonpolar, whereas the side chain for serineis polar?(b) Which amino acid has a hydrophilic side chain and which has a hydrophobic sidechain?arrow_forward
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- The R group or side chain of the amino acid serine is -CH2-OH. The R group or side chain of the amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino acids in a globular protein in aqueous solution ?A) Both serine and leucine would be on the exterior of the globular protein. B) Both serine and leucine would be in the interior and on the exterior of the globular protein. C) Serine would be in the interior, and leucine would be on the exterior of the globular protein. D) Both serine and leucine would be in the interior of the globular protein. E) Leucine would be in the interior, and serine would be on the exterior of the globular protein.arrow_forwardWhat kind of bond would you expect between the side chains of the following amino acids?(a) Cysteine and cysteine(b) Alanine and leucine(c) Aspartic acid and asparagine(d) Serine and lysinearrow_forwardWhich of the following statements are False? (i) Parallel b-sheets characteristically distribute hydrophobic side chains on both sides of the sheet, and antiparallel B-sheets are usually arranged with all their hydrophobic residues on one side of the sheet. (ii) Planarity of the peptide bond means that no rotation occurs about the N-Ca bond while rotation is allowed about the C(O)-N and Ca-C(O) bonds. (iii) Silk fibers consist of fibroin proteins consisting of alternating A and G or S residues. (iv) If an aspartic acid residue were present in the interior of a globular protein, it would most likely be deprotonated and thus negatively charged.arrow_forward
- Which peptide has greater absorbance at 280 nm? Why? a) Gly-Ala-Trp-Lys-Glu-Tyr-Hisb) Ser-Val-Phe-Gly-Ala-Leu-Ilec) Gln-Leu-Glu-Phe-Thr-Leu-Tyrarrow_forwardTaurine (2-aminoethanesulfonic acid) is sometimes called an amino acid. (a) Explain why this designation is not valid. (b) From which of the 20 standard amino acids is taurine derived? Describe the chemical change(s) that occurred.arrow_forwardWhich of the following amino acids is most likely to be found on the outside of a soluble protein? Which is more likely to be found on the inside? Explain each answer. (Hint: Consider the effect of the amino acid side chain in each case and that the protein is folded up into its globularform.)(a) Leucine (b) Glutamate(c) Phenylalanine (d) Glutaminearrow_forward
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