Concept explainers
Interpretation:
The stereoisomer of
Concept introduction:
A
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ORGANIC CHEMISTRY E-BOOK W/SMARTWORK5
- A chemically modified guanidino group is present in cimetidine (Tagamet), a widely prescribed drug for the control of gastric acidity and peptic ulcers. Cimetidine reduces gastric acid secretion by inhibiting the interaction of histamine with gastric H2 receptors. In the development of this drug, a cyano group was added to the substituted guanidino group to alter its basicity. Do you expect this modified guanidino group to be more basic or less basic than the guanidino group of arginine? Explain.arrow_forward22-21 Explain why an amino acid cannot exist in an un-ionized form at any pH.arrow_forward22-9 What is the difference in structure between tyrosine and phenylalanine?arrow_forward
- A tripeptides (made from one asparagine molecule, one cysteine molecule and one glutamic acid molecule) were synthesised. Hand-draw the skeletal structures of two possible tripeptides formed from these three amino acids, identifying the peptide bonds in each molecule.arrow_forwardDraw the structure formed between alpha-L-erythose with amino acid asparagine and label the type of bond that is formed.arrow_forwardDraw the 3 amino acids formed when this tripeptide is hydrolysed in a boiling solution containing a strong acid. Circle the R-groups on your answers for question i. and indicate if these R-groups are polar, nonpolar or charged.arrow_forward
- How many different tetrapeptides can be made under the following conditions? Q.) All 20 amino acids can be used, but each only once.arrow_forwardPlease answer these 3 questions below. 1. What type of interaction would you expect between the R groups, lysine and aspartic acid, in tertiary structure? a. Hydrophilic b. Disulfide bonds c. Hydrophobic/London dispersion d. Electrostatic interactions e. Hydrogen bond 2. Which of the following amino acids have R groups that are polar? Cystine, Glutamine, Leucine a. Cysteine, Glutamine, Leucine are all polar b. Only Cysteine and Glutamine are polar c. Only Glutamine and Leucine are polar d. Only Leucine is polar e. None of the listed amino acids are polararrow_forwardWhich of these molecules is not a natural amino acid?arrow_forward
- Identify an amino acid that complies with the following characteristic: (Write the COMPLETE name) A side chain that reacts with HCl via acid-base reactionarrow_forward22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?arrow_forwardWhat special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?arrow_forward
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