Concept explainers
(a)
Interpretation:
RNA is treated with periodic acid, and the product of that reaction treated with base, only the
Concept Introduction:
RNA is made of ribose sugar and nucleotides. Periodic acid is an oxidizing agent. It oxidizes the vicinal
(b)
Interpretation:
The same reaction can be performed with DNA or not, is to be explained.
Concept Introduction:
DNA is deoxyribose
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EBK ORGANIC CHEMISTRY
- Answer ALL parts of this question. (a) Provide the structure and name of the aldehyde with the formula, C2H4O. (b) Draw the two steps of the Strecker synthesis used for the conversion of the aldehyde in part (a) into racemic alanine. (c) Draw the (R) and (S) enantiomers of alanine. Which is the naturally occurring enantiomer? (d) Draw the structure of the dipeptide, Ala-Gly.arrow_forwardWhich of the following are most likely to behave as electrophiles, and which as nucleophiles? Explain.(a) NH4(b) CqN (c) Br (d) CH3NH2 (e) HOCqCOHarrow_forwardExcercise 2 Chloromethane reacts with hydroxide ion to form methanol as shown in the equation below. OH + CH3CI - CH3OH + CI- (a) Identify the nucleophile and electrophile. (b) State the type of reaction.arrow_forward
- In the double-helical structure of DNA, the base guanineis always bonded to cytosine, and adenine is alwaysbonded to thymine. What do you expect to be the relativeproportional amounts of A, T, C, and G in a givenlength of DNA?arrow_forwardDraw the structure of the predominant form of a mixture of alanine, lysine, and aspartic acid at (i) pH 6; (ii) pH 11; (iii) pH 2.arrow_forwardExposure to nitrous acid (see Section 19-16), sometimes found in cells, can convert cytosine to uracil.(a) Propose a mechanism for this conversion.(b) Explain how this conversion would be mutagenic upon replication.(c) DNA generally includes thymine, rather than uracil (found in RNA). Based on this fact, explain why the nitrous-acidinduced mutation of cytosine to uracil is more easily repaired in DNA than it is in RNA.*arrow_forward
- (a) Differentiate between copolymerization and homopolymerization. Give one example of each.(b) What is the role of Benzoyl peroxide in preparation of Polythene?arrow_forwardAnswer Q18, 19, 20, 21arrow_forward, aminobenzene sulfonic acid will be synthesized, called sulfanilic acid. This will be done by (1) sulfonating an aniline with sulfuric acid. The first step in this reaction will be the formation of salt, anilinium bisulfate (2). When the salt becomes heated, it will then produce sulfanilic acid (3). Since the compound will contain both an acidic group, -SO3H, and a basic group, -NH2, an internal acid-base reaction can produce a dipolar ion (4). What is the mechanism for this reaction using proper curved arrow notation?arrow_forward
- A naturally occurring amino acid such as alanine has a group that is a carboxylic acid and a group that is a protonated amine. The pKa values of the two groups are shown.(a). If the pKa value of a carboxylic acid such as acetic acid is about 5, then why is the pKa value of the carboxylic acid group of alanine so much lower? (b). Draw the structure of alanine in a solution at pH = 0. (c). Draw the structure of alanine in a solution at physiological pH (pH 7.4).(d). Draw the structure of alanine in a solution at pH = 12. (e). Is there a pH at which alanine is uncharged (that is, neither group has a charge)? (f) At what pH does alanine have no net charge (that is, the amount of negative charge is the same as the amount of positive charge)?arrow_forwardIn the discussion of poly(ether ether ketone), or PEEK, in Section 26.6a.2, we observed that the addition of a tert-butyl group to the aromatic ring increases the solubility of a PEEK in organic solvents. However, when researchers added a second tert-butyl group, as shown here, they found that the solubility of the PEEK decreased. Explain this observation. A PEEK with two tert-butyl groups per repeating unitarrow_forwardIdentify monomeric and multimeric (di-,tri-meric, for example) saccharides from this group. If you come across multimeric polypeptides, state the mono- mers that form these multimers. State the nature of the bond that links two units together in each case. (a) Maltose (b) Trehalose (c) Lactose (d) Sucrose (e) Cellobiose (f) Agarosearrow_forward
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