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- Doxorubicin, shown here, is an important chemotherapy drug used to treat avariety of cancers, including bladder cancer, breast cancer, and certain forms of leukemia. Doxorubicin works by binding to DNA in such a way that a portion of it penetrates the DNA double helix— a process called intercalation. During transcription— the process that forms RNA— portions of the DNA strands are temporarily separated for the base sequence to be read and then are reconnected. With bound doxorubicin, however, the double helix does not reform properly after the strands are separated, which disrupts replication— the process that forms an identical copy of DNA. Which portion of doxorubicin do you think intercalates into the DNA double helix, and why do you think it has little difficulty doing so?XeF2O, ClO4-, HNO2, CH3CH(NH2)COOH (amino acid alanine). Identify the molecules with the following labels (1 is more than one label): Oxyacid, has a resonance structure, expanded octet, has a carbon backbone6. Breaking peptide bonds is hard. a) Draw steps for (i) addition of water and (ii) elimination of the amine from the CO-NH bond of R-CO-NH-R' ("the reactant"). Include any intermediate steps like proton transfer. b) Draw a resonance structure for the reactant. c) What is the hybridization of the reactant's indicated (i) C, (ii) N, and (iii) O? d) What 2 factors make this hydrolysis reaction slower than hydrolysis of R-co-S-R'-? e) In nature, peptide bonds are hydrolyzed by enzymes including cysteine proteases. Cysteine's structure is HS HO ÑH2 Draw nucleophilic attack of cysteine's thiol on the reactant with the arrow formalism. f) In the resulting tetrahedral intermediate, what is the best leaving group? g) Show how an acidic residue of an enzyme (which you can draw as HA) might help facilitate departure of the amine as the leaving group, by drawing a suitable reaction mechanism (including the acid proton) using the arrow formalism.
- 6. The structure originally proposed for Cordycepic acid, [a] = + 40.3°, has been shown to be in correct, suggest reason to be skeptical about the original structure, which is given below. CO2H HO Not OH HO OH1,1'-diethyl-2,2'-carbocyanine chloride 1. What is the value of "n" for the HOMO for the molecule? n=# bondsf 9. Determine the molecular formulas and then draw line-angle structures for the following condensed structures. Do these three structures represent the same molecule? Explain. (a) (CH3)3CCH₂CH₂COCH₂CHBrCH(CH3)2 (b) (CH3)3CCHCHCHOHCH₂CHBrCH(CH3)2 (c) (CH3)2CHCHBRCH₂CO(CH₂)2C(CH3)3
- Draw a complete lewis structure for the CONJUGATE ACID of Nitromethane (condensed formula CH3NOOH). Draw a complete lewis structure that shows all bonds, unshared electron pairs, and minimized formal charges where appropriate.Groups that donate electrons to the ring are formed in a shorter time under mild conditions, increasing the electron density of the ring. Is that true or false?( find structure asap plz C10H20 )
- Draw Lewis Structures for the following compounds. (Be sure to minimize formal charges and draw resonance structures where appropriate.): XeF2O, ClO4-, HNO2, CH3CH(NH2)COOH (amino acid alanine). Identify the molecules with the following labels (1 is more than one label): Oxyacid, has a resonance structure, expanded octet, has a carbon backbone For the molecule with resonance structures—what is the bond order for the atoms that share e-?2. Calculate AH for the reaction; C₂H₂ (s) → 2 C (s) + H₂ (g), from the following Data; 1) CO2 (g) → C (s) +O2 (g) 2) 2 H₂O (1)→ → 2 2 H2 H2 (g) + O2 (g) 3) 2 C2H2 (s) + 5 O2 (g) → 4 CO2 (g) + 2 H₂O (1) ΔΗ = +394 kJ ΔΗ = +572 kJ AH = -2600 kJWrite the General formula and Line Structure of the standard amino acids. A. Alkyl Glycine (Gly,G) Alanine (Ala,A) Valine (Val, V) Proline (Pro,P) Isoleucine (Ile,I) Leucine (Leu,L) B. Sulfur-containing Cysteine (Cys,C) Methionine (Met,M) C.Alcohols Serine (Ser,S) Threonine (Thr,T)
