1. Complete the given table below. What properties do each of the following R groups have? Hydrophilic or |hydrophobic Basic, acidic, or Polar or nonpolar R Group neutral CH, CH3 b. CH2 CH2 CH2 CH2 NH5 d. CH2 он
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- Shown below are three amino acids: H,N-CH-C-o ҫн, H,N-CH-C-o CH, H,N-CH-C-o ČH, Tyrosine Tyr Y Phenylalanine Phe F Alanine Ala A 1. Which amino acid is the least hydrophobic? 2. Which amino acid is most hydrophobic? 3. Which amino acid is intermediate? 4. Explain why (2) is more hydrophobic than (3). 5. Explain why (3) is more hydrophobic than (1).13. The structures of sphingosine and choline are given below. Draw the condensed structure and block diagram of the sphingolipid formed from these molecules and a molecule of myristic acid. CH3-(CH2)12-CH=CH-CH-OH CH₂ CH3-N-CH2-CH2-OH CH-NH2 sphingosine CH2-OH CH3 choline BLOCK DIAGRAM (draw below) CONDENSED STRUCTURE 14. Which fatty acid below should have the highest melting point? Why? Explain your answer based on structure and forces of attraction. OH O OH TOH OHExercise A: Amino Acid Functional Groups Figure 1 below shows one of the 20 amino acids that make up proteins. Recall that carbon can form four covalent bonds. Amino acids consist of a central carbon, called the a-carbon, that is bonded to four different chemical groups. H + CH2 OH Figure 1. Structure of an amino acid Answer the below questions in your own document. • On the amino acid shown in Figure 1, label the a-carbon. • The a-carbon of each of the 20 amino acids is bonded to one hydrogen atom, one amino group, one carboxyl group, and one R group (more on that below). You should recognize the amino and carboxyl groups from our discussion of functional groups in organic molecules. Circle and label* the amino group and the carboxyl group in Figure 1. *Note: our goal in this question, and in similar questions throughout this lab, is for you to be able to identify specific structures. You can do this circling/labeling in whatever way is easiest for you. You might want to draw the…
- Below is a representation of glutamic acid with three incomplete functional groups in dashed boxes labeled A, B, and C. From the drop down menus choose the correct form of each chemical group that completes the structure of glutamic acid at pH =1. A COO H-C-CH₂-CH₂-COO N C A [Select] B [Select] B C [Select]6. Identify the following functional groups AND provide an example of one biomolecule containing that functional group. A B C D E Chemical formula - PO, - COH -OH -COOH -NH₂ Structural formula O -O-P-0° 0= 0- N H -OH C=O OH H H Example: Example: Example: Example: Example: Riomolecules:A polypeptide is shown below. Please answer the following questions. OH В A H;N E a. Match the letter labels to the appropriate components of a polypeptide. carbonyl group [ Select ] amide [ Select ] alpha amino group [ Select ] alpha carboxylic group [ Select ] peptide bond [Select] b. How many peptide bonds are in this polypeptide? [ Select ] V Residues? [ Select ] c. If the second residue were replaced with glutamic acid would the pl increase or decrease? [ Select ] >
- Which of the following shows the reaction by which valine and leucine form a peptide bond H. H. H O -COO H2N-C-C-NH- C- C-OH + HO CH2 CH,SH ČH3 А. C. CH(CH)2 H. HN-C-C-NH-C- C-OH H,N-CH-C- + H,O HC-C-H CH2 CH2 H CH3 CH H,C-C-H CH(CH3)2 CH В. D.Given the figure below. Which structure is predominant at pH = 8.0? (Note: The amino acid structures on the topmost portion are labeled as A, B, C and D from left to right) * çOOH pK1 H3Nt CH CH2 CH2 CH2 ČH2 NH3* poo H2N-CH CH2 CH2 GH2 CH2 NH2 foo H2N-CH CH2 çoo pK2 pk3 CH2 CH2 NH3* NH3* 14 1 pK2 pl pk3 12 10 pH 6 4 pK1 2 0.5 1 1.5 2 2.5 3 Equivalents of OHFollowing is a structural formula for the amino acid cysteine: 11 HS-CH₂-CH-C-OH NH₂ Name the three functional groups in cysteine. a. What is the name of the highlighted functional group? HS-CH₂-CH-C-OH NH₂ O carboxyl group O amino group O thiol group O disulfide group What is the name of the highlighted functional group? O HS-CH₂-CH-C-OH NH₂ O carboxyl group O amino group O thiol group O disulfide group Previous Next
- Match the structures below with the type or name of the structure. Each match should be used only once. > CH₂ CH- но. CH HO CH₂ CH-0_8 0= CHÍNH CH,O L CH₂0-8- CH2O O=C O–CH,CH O=0 NH3 2−CH2-CH NH3 COO 1. triacylglyceride 2. fatty acid 3. phosphatidyl serine 4. sphingomyelinYou are studying a novel amino acid. It has an alpha-amino and an alpha-carboxylic group, and an ionizable side chain that carries a carboxylic group. A titration curve is shown below. Net charge a CD f 0 1 2 3 4 5 +1 [Select] 0 [Select] 6 7 pH Choose the letter that corresponds to the following charges on this novel acid. +2 [Select] -0.5 [ [Select] -1 [Select] 8 -2 [Select] I 9 10 11 12 13What type lipid is shown in the structure below? ÇH2OH но H. OH H/H CH2OH ÇH2OH ÇH2OH но H OH H H. NH-C-CH3A H он он CH3-č- Ço0- CH2- снон снон CH2OH NH CH HC (CH216 CH3 ÔH H (CH212 O phosphoglyceride O sphingolipid O sulfolipid O archaeal tetraether lipid