Which four statements about amino acids are true? The form of glycine used by the human body is D-glycine. Proline has an overall charge at physiological pH (7.4). The Leu side chain does not form hydrogen bonds with other amino acids. Lysine has one stereocenter (chiral center). Phe can undergo oxidation to form Tyr. Gln and Asn are polar amino acids. Methionine is a thiol.

Which four statements about amino acids are true? The form of glycine used by the human body is D-glycine. Proline has an overall charge at physiological pH (7.4). The Leu side chain does not form hydrogen bonds with other amino acids. Lysine has one stereocenter (chiral center). Phe can undergo oxidation to form Tyr. Gln and Asn are polar amino acids. Methionine is a thiol.

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter2: Molecules Of Life

Section: Chapter Questions

Problem 4FIO: Figure 2.17 Fatty acids. Double bonds in the tails are highlighted in red. A. The tail of stearic...

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Figure 2.17 Fatty acids. Double bonds in the tails are highlighted in red. A. The tail of stearic acid is fully saturated with hydrogen atoms. B. Linoleic acid, with two double bonds, is unsaturated. The first double bond occurs at the sixth carbon from the end of the tail, so linoleic acid is called an omega-6 fatty acid. Omega-6 and C. omega-3 fatty acids are essential fatty acids, which means your body does not make them and they must come from food. D. The hydrogen atoms around the double bond in oleic acid are on the same side of the tail. Most other naturally occurring unsaturated fatty acids have these cis bonds. E. Hydrogenation creates abundant trans bonds, with hydrogen atoms on opposite sides of the tail. Figure It Out: Are the double bonds in linolenic acid cis or trans?
Unlike saturated fatty acids, the tails of unsaturated fatty acids incorporate one or more _______. a. phosphate groups b. glycerols c. double bonds d. single bonds
Which 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.
What do most amino acids have in common with most monosaccharides? Both contain ionizable groups that lack pka values. Both non-enzymatically attach themselves to nucleic acids. Both are transported by albumin within the blood. Both exist as isomers, due to differences in stereochemistry.
Which of the following statements is incorrect? The rigidity of a saturated fatty acid is based on the strong bonding between sp3-hybridized carbon chains. Glycerophospholipids are the most abundant lipids in cellular membranes. In delta notation of fatty acid nomenclature, the numbering starts at the α-carbon from the carboxylic acid end. Hormones, such as testosterone, estradiol and progesterone are examples of steroidal lipids.
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 true regarding the classification of amino acids? Group of answer choices The side chain of a polar basic amino acid contains hydroxyl groups The side chain of a polar acid amino acid contains carboxyl groups The side chain of the non-polar amino acid can exhibit H-bonding. The side chain of a polar amino acid contains hydrocarbon groups only
Which statement about the glycoprotein shown below is true? OH CH₂OH OH HN HN-C =0 CH3 H₂ Protein CH N-H Protein It contains a deoxyribose sugar that could be metabolized by human enzymes. O The monosaccharide is attached to the protein via nitrogen in a residue's a-amine. It contains a ribose sugar that could not be metabolized by human enzymes. The monosaccharide is attached to the protein via nitrogen in a residue's side chain.
Which of the following statements about amino acids is/are incorrect? 1. Standard amino acids are so named because these are the only amino acids there are. 2. Essential amino acids can be synthesized by the organism. 3. All standard amino acids are optically active. 4. Overall, naturally occurring amino acids are equally likely to be found having either an R or S configuration around the alpha carbon. O 1, 3, and 4 O 1, 2, 3, and 4 1 and 2 O 1, 2, and 3
Which of the following pairs of amino acids can have intermolecular hydrogen bonding between the functional groups in their side chains? Select all that apply. phenylalanine and tyrosine two tyrosine residues serine and threonine alanine and threonine
Why do amino acids display a lower pKa value for the carboxylic acid group compared to acetic acid? The chirality of the amino acid favors the deprotonation of the carboxylic acid function. The ammonium function on the chiral center helps to stabilize the negative charge on the carboxylate. Amino acids have a higher melting point than acetic acid. The carboxylate ion is stabilized by the side chain of the amino acid. The negative charge on the carboxylate is stabilized by resonance with the amino group.
Which of the following is not true about a-amino acids? have at least 2 pka values O negatively charged at pH = 1.0 most contain one chiral center can act as buffers