What do most amino acids have in common with most monosaccharides? O Both contain ionizable groups that lack pka values. O Both non-enzymatically attach themselves to nucleic acids. O Both are transported by albumin within the blood. Both exist as isomers, due to differences in stereochemistry.
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- In the following list, identify the carbohydrate, the fatty acid, the amino acid, and the polypeptide: a. NH2CHRCOOH b. C6H12O6 c. (methionine)20 d. CH3(CH2)16COOHWhich of the following is true of sphingolipids? They always contain glycerol and fatty acids. They may be charged, but are never amphipathic. They contain two esterified fatty acids. Phosphatidylcholine is a typical sphingolipid. The sphingosine backbone is O-linked to a head group.The common amino acids are polyprotic acids. All amino acids contain an amino group and a carboxyl group. Some amino acids contain ionizable side chains. The presence of an ionizable side chain creates a third ionizable group. For a diprotic amino acid such as glycine (structure shown below), three forms are possible. These forms, the fully protonated (AA*), single deprotonated (AA°), and completely deprotonated (AA) exhibit different acid-base properties. NH;+ NH,+ NH, Neutral H,A (AA+) A- (AA•) (AA-) The Ka describing the AA* and the AA° equilibrium is 4.57 x10-3, while the Ka involving AA° and the anionic form AA- is a much smaller 2.51 x 10-10, The neutral form, AA° is referred to as isoelectric glycine. All amino acids can assume the isoelectric form under proper conditions. a. Calculate the pH of a 0.1 M solution prepared from the salt glycine hydrochloride (hint: use ICE table).
- One or more of the compounds shown below will satisfy each of the following statements. Not all compounds may be used; some may be used twice. Put the number(s) in the blank. (1) Found in chitin. (2) An L-saccharide. (3) The first residue attached to asparagine in N-linked glycans. (4) A uronic acid. (5) A ketose. CH,OH CoO COO OH H H H H ОН Н но OH OH H OH H HO OH H NHC- CH, Oso, OH (a) (b) (c) CH,OH CH,OH CH,OH C=0 CHOH C=0 H-C- OH CH,OH но -с-н ČH,OH CH,OH (d) (e)Which of the following statements regarding lipids is most accurate? 1. Lipids are synthesized by ribosomes 2. Saturated fats tend to be solid at room temperature because of the polar hydrocarbon chains 3. Saturated fats tend to be liquid at room temperature due to hydrogen bonding 4. Polyunsaturated fats tend to be liquid at room temperature due to numerous double bonds in the hydrocarbon chains 5. The empirical formula for lipids is typically C1H201Glycosaminoglycans have the following characteristics except— Each disaccharide unit contains a N-acetylmuramic acid. Each disaccharide unit contains an N-acetyl-hexosamine. They consist of disaccharide units. Either or both monosaccharide in the disaccharide unit may be sulfated. They often carry high density of negative charge.
- Which of the following statements about Lipopolysaccharide is FALSE? The lipid A portion is a form of bacterial toxin. The core oligosaccharide contains unusual or unique monosaccharides. The basal ring complexes are composed of the protein flagellin. O The O-linked oligosaccharide is the same "O" antigen used in specific epithets such as "0157:H7". O Lipopolysaccharide is often referred to as bacterial endotoxin.A polyunsaturated, w-9 fatty acid has 20 carbons. It has three sites of unsaturation and the double bonds are positioned such that there is one intervening carbon in between the double bonds. What is the simplified notation for this acid using A notation? O 20:4 (ASA11,13) O 20:3 (A9.11.13) O 20:3 (A79.11) O 20:3 (ASA1)which of the following statements is correct regarding the affect of pH on the ionization of R groups in amino acids. Put yes or no next to each number. 1) at an acidic pH, amino groups in an R group tend to lonize by accepting a proton and have a positive charge2) at an acidic pH, carboxyl groups in an R group are likely to be in an unionized state.3) at an alkaline pH, amino groups in an R group have a tendency to remain unionized (and uncharged).4) at an alkaline pH, carboxyl groups in an R group have a tendency to lonize by loosing a hydrogen ion (H+)5) R groups that do not have an amino or carboxyl group do not ionize at pH of the environment changes.
- Which one of the following would be a valid symbol identifier of the fatty acid shown below? HO 22:6(D5,8,11,14,17,20) 22:6(D3,6,9, 12, 15, 18) 22:5(w-4) 22:6(w-3) 22:6(w-6)Lipids serve as all of the following exceptWhich of the following statements regarding lipids is most accurate? 1. The empirical formula for lipids is typically C1H201 2. Saturated fats tend to be solid at room temperature because of the polar hydrocarbon Chain. 3. Polyunsaturated fats tend to be liquid at room temperature due to numerous double bonds in the hydrocarbon chains 4. Saturated fats tend to be liquid at room fèmperature due to hydrogen bonding 5. Lipids are synthesized by ribosomes