Concept explainers
(a)
Interpretation:
Difference in
Concept introduction:
Secondary structure is a regular pattern of
Tropocallogen is a quaternary structure of collagen and is a fibrous protein.
(b)
Interpretation:
Difference in
Concept introduction:
Secondary structure is a regular pattern of
Tropocallogen is a quaternary structure of collagen and is a fibrous protein.
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Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
- a) This molecule is produced when what amino acid is transaminated? b) What are the one- and three-letter abbreviations for this amino acid?arrow_forwardOne 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)arrow_forwardThe melting points of a series of 18-carbon fatty acids are: stearic acid, 69.6 °C; oleic acid, 13.4 °C; linoleic acid, −5 °C; and linolenic acid, −11 °C.(a) What structural aspect of these 18-carbon fatty acids can be correlated with the melting point?(b) Draw all the possible triacylglycerols that can be constructed from glycerol, palmitic acid, and oleic acid. Rank them in order of increasing melting point.(c) Branched-chain fatty acids are found in some bacterial membrane lipids. Would their presence increase or decrease the fluidity of the membrane (that is, give the lipids a lower or higher melting point)? Why?arrow_forward
- a)This type of lipid is a complex mixture of esters of long-chain carboxylic acids and long- chain alcohols. b)The number of double bonds present in the metabolic precursor of all prostaglandins. please identify the unknowns. thank you.arrow_forwardThe common naturally occurring form of cysteine has a chirality center that is named (R), however; (a) What is the relationship between (R)-cysteine and (S)-alanine? (b) Do they have the opposite three-dimensional configuration (as the names might suggest) or the same configuration? (c) Is (R)-cysteine a D-amino acid or an L-amino acid?arrow_forwardIn the peptide Ala – Gly – Val – Phe – Tyr, a carboxylate (-COO-) group would bound in which amino acid? A) Gly b) Ala c) Phe d) Tyr Which amino acid forms disulfide bonds? A) Met b) Cys c) Arg d) Pro The sequence Gly-Pro-Pro is often found in collagen. This would be a description of: a) primary structure b) secondary structure c) tertiary structure d) quaternary structurearrow_forward
- Which of the following is true A) The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine destabilizes protein tertiary structure. B) The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine destabilizes protein tertiary structure. C) The disulfide bridges formed by oxidation of the sulfhydryl groups on cysteine stabilizes protein tertiary structure. D) The disulfide bridges formed by reduction of the sulfhydryl groups on cysteine stabilizes protein tertiary structure.arrow_forwardThe isoelectric point of an amino acid is the point where; O a) the amino acid carries no net electrical charge b) the a-carboxylic acid is protonated and the a-amino group is unprotonated c) ) the pKa of the a-carboxylic acid is the same as the pK, of the a-amino group a d) the solubility of the amino acid is maximized e) the a-carboxylic acid and the a-amino group are both half protonated MacBo 80 000 esc F1 F2 F3 F4arrow_forwardFor each of the following amino acids: 1) describe what the important functional group of the amino acid side chain is, 2) identify the charge of the side chain, 3) name another component in the structure that the amino acid might interact with, and 4) indicate how the interaction with the component listed in 3) might be occurring (i.e., electrostatic interaction, hydrogen bond, hydrophobic interaction, etc.) a) Asp153 b) Arg166 c) Lys167arrow_forward
- Which of the following are saponifiable lipids? (Recall that ester bonds are broken by base hydrolysis.)(a) Progesterone (b) Glyceryl trioleate(c) A sphingomyelin (d) Prostaglandin E1(e) A cerebroside (f) A lecithinarrow_forwardDraw the Fischer projections representing the L forms of the following amino acids at pH higher than their isoelectric point. a) cysteine b) alaninearrow_forward(a) Draw the structure of ninhydrin. (b)Write the complete equation for its reaction with amino acids. (c) What is the substance responsible for the purple colour produced upon reaction of ninhydrin with an amino acid?arrow_forward
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