Which of the following structures is a 20:2 ^A4,9 fatty acid? CH3CH2CH = CH(CH2)3CH = CH(CH2)10COOH CH3(CH2)2CH = CH(CH2)3CH = CH(CH2)9COOH CH3(CH2)10CH = CH(CH2)3CH = CHCH2COOH сн3(CH2)9CH - сH(CH2)3CH %3D CH(CH2)2C00H
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- OOC H₂C 1 H₂C H₂C H₂C-C HC H₂C NH N CON HN C COO™® 1 CH₂ CH₂ C-CH₂ CH C-CH, G=CH₂ "ooc H₂C H₂C H₂C H₂C-C HC 0-N H₂C Fe(ll) COO 1 CH₂ CH₂ C-CH₂ C-CH₂ G=CH₂ The structure below is Fe- protoporphyrin IX. It is linked by bridging groups to form porphyrin ring. Addition of Fe to the porphyrin rings produces the heme group. Identify the group of atoms that can for H-bond interaction with water.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. sphingomyelinSelect the choice that best describes the stereochemistry of the following amino acid, and rank the priority of the four groups surrounding the alpha carbon (in DESCENDING order: 1-highest 4-lowest) NH₂ CO₂II CH₂SH Cysteine H D and S, (1-NH2, 2-CH2SH, 3-COOH, 4-H) Land R, (1-NH2, 2-COOH, 3-CH2SH, 4-H) OL and R, (1-NH2, 2-CH2SH, 3-COOH, 4-H) D and S, (1-CH2SH, 2-COQH, 3-NH2, 4-H) H
- Modify isoleucine to show the predominant forms at pH 1, 7, and 13. Isoleucine has, values of 2.4 (carboxyl group) and 9.7 (amino group). Isoleucine at pH 7 Isoleucine at pH 1 CH3 CH₂ + H₂C CH +H₂N- C H Incorrect Isoleucine at pH 13 Incorrect H₂C H₂N- CH₂ | CH₂ CH c- C H 0 ĭ Incorrect H₂C +H₂N-Consider the structure of the tripeptide (in its fully protonated form) below. H H H + I || H₂N-C-C-N-C-C-N-C-C-OH 1 I | H CH₂ H CH₂ CH₂ T C=O OH AA1 0=0 || HC-CH3 CH3 AA2 AA3 0=C 1. Give the sequence of the tripeptide using the ONE-LETTER DESIGNATION (UPPERCASE LETTER) with NO spaces and symbols between each letter. 2. How many ionizable groups are there in the tripeptide? Give the numerical value (e.g., 10 not ten). • pH 10: {Choices: -2, -1, 0, +1, +2} 3. Which amino acid residue has one ionizable group left upon forming the tripeptide? {Choices: AA1, AA2, AA3, none, all} 4. Give the net charge of the dominant structure of the tripeptide at the given pH values. The pK, values of the amino acids are given in Table 1. • pH 4: {Choices: -2, -1, 0, +1, +2}Copy of The following reaction scheme shows the states of the amino acid hisitdine. Histidine has three pKa's - 2, 6 and 9.2. Which form of Histidine predominates at pH of 5? *H3N-CH-Ĉ-OH CH2 *H3N-CH-C–O- CH2 "H3N-CH-C-O- CH2 H2N-CH-C–O- CH2 +HN *HN N' -NH -NH -NH NH A C O A. A ОВ. В OC.C O D.D O E. The answer cannot be determined with information given.
- Compound A is Cephalin: CH2-O-CO-(CH2)14-CH3 CH2-O-CO-(CH2)14-CH3 CH2-O-P(O)-0-CH2-CH2-NH3* Cephalin : Compound A Mark the various functional group as Glycerol Fatty acids Phosphoric acid Amino alcohol Is this a saponifiable or a non-saponifiable lipid? Are the fatty acids saturated or unsaturated? Can you write the IUPAC name of the amino alcohol?Consider the structure of the tripeptide below. H O 11 H₂N-C-C-N-C-c- CH₂ CH₂ C=0 NH₂ pH 5: Z-I pH 10: H HN H O 11 CH₂ NH HIC- I-Z 0=6 -N-C-C-OH 1. What is the sequence of the tripeptide? (use the one-letter symbol, do not put dash or space in between symbols) 2. What is the net charge of the dominant structure of the tripeptide at the given pH values? The pK, values of the amino acids are given in Table 1. CH-OH T CH3 Table 1. pk, values of the standard amino acids.Given the following peptide, answer following questions 1-5: CO CH2 O || CH2 O H3N-CH-C-NH- CH-c-OCH3 | 1. Is this a dipeptide or tripeptide? 2. How many amino acid components/residues are there? 3. Name these amino acids. 4. What kind of bond links these amino acids? 5. The above structure represents the major ingredient in some commercial product(s). Identify the name of this major ingredient or the commercial product(s). Given that the hemagglutininin protein in influenza virus contains a remarkably long a-helix with 53 residues, answer questions 6-7. 6. How long is this a-helix (in nm)? Show all calculations. 7. How many turns does this helix have? Show all calculations.
- Place each charge form of alanine under the pH condition where it would be the predominant form. The pK₁ values for the carboxyl group and amino group of alanine are approximately 2.3 and 9.7, respectively. pH 11 H | H₂C-C-COO NH₂ Does not occur in significant amounts at any pHExercise 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…In the following scheme: HH, H₂C-C-C-Coo II HO H • NH, 1 H₂C-C-C-C000 H 2-Amino-3-ketobutyrate ↓ O H,C-C-CH₂-NH₂ Aminoacetone 0 0 H₂C-C-C-H Methylglyoxal H H₂C-C-COO OH D-Lactate O H₂C-C-C000 Pyruvate What molecule is being metabolized? Identify the reaction at each step. If it is an oxidation-reduction prove this is correct by showing oxidation state changes on the atoms in the structure.