H₂N H H₂C 0 a. Peptide bonds b. N terminal (name) C. C terminal (name) OH
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- 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.2. Amino Acid Stereochemistry. Hypothetical Situation: A novel amino acid is isolated from a hyperthermophilic bacterium discovered in Lassen National Park. The discovery is published in the Journal Science by a group of microbiologists from the CSU-Chico Department of Biology. The amino acid structure is shown below. H₂N- HO Ç CH₂ C1H OH CH₂ (a) Designate the stereochemical configuration (R or S) of all the chiral centers in the molecule. (b) is this a D- or L-amino acid? Would you expect to find it as part of a polypeptide? Why or why not?A coiled peptide chain held in place by hydrogen bonding between peptide bonds in the same chain is إختر أحد الخيارات B-pleated sheets a O Primary structure b O Tertiary structure.cO a-helix .d O
- At physiological pH, the 06-methylguanine:T wobble base pair predominates. Two hydrogen bonds form between the two bases. Draw the structure of this base pair. Use bond Any to draw hydrogen bonds. H;C H N- N- R -N. N-H- R HH. N-C-C Choose A if the statement is CORRECT B if the statement is WRONG H он CH, This amino acid is/has: CH2 6. polar CH2 | CH2 | NH, _7. charged 8. basic side chain 9. aromatic side chain 10. KSelect the incorrect statement(s). CH₂ OH NH₂ Polypeptide backbone CH₂ A C- CH₂ CH CH3 CH3 CH3 CH3 CH CH₂ NH₂ CH₂ CH₂ CH₂ CH₂ B D This is a tertiary structure of a protein. Letter A represents hydrogen bond. Letter C represents disulfide bond. This represents a secondary structure. This illustrates a quaternary structure.
- H онн C-C-N -C C-N OH +H20 HH H. H N- C-N-C-C OH OH H. R R The chemical reaction illustrated in the accompanying figure H H C-N-C-C OH N- -C OH R R The chemical reaction illustrated in the accompanying figure O links two monomers to form a polymer separates two phospholipids in a bilayer breaks a peptide bond is a hydrolysis reaction in a polysaccharide A piece of DNA has the following sequence: 5' TCATGG 3'. What would be the sequence of the complementary strand? O 3'AGTACC 5' O S' AGTACC 3 O3 CCATGA 5 O s CCATGA 3 Refer to the accompanying figure. RNA at the beginning of the strands are shaded in lighter color. Identify th leading strand in this figure! O a O b HICIRA 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 ] >Exercise 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…
- How many peptide bonds are contained within the peptide structure depicted? СООН COOH NH .N. .N. .N. H2N `N' COOH СООН `COOH СООН ZI ZI IZ ZInd me; How are monomers joined fogether into poly mners? How are poly mers broken apart into mon omers? Chemical Structure and Behavior - Worksheet A process called: 12. Consider the structure of the amino acid aspartic acid. Indicate the hybridization about each interior atom. H H