BIOCHEMISTRY II >CUSTOM<
17th Edition
ISBN: 9781337449014
Author: GARRETT
Publisher: CENGAGE C
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Chapter 23, Problem 20P
Understanding a Ubiquitous Series of Metabolic Reactions Study Figure 23.9. Where else in
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carbons in each of the structures below. For instance, the central carbon of chloromethylbutane (pictured
3. A chiral carbon is a carbon that is single-bonded to four different types of groups. Identify the chiral
above) is a chiral carbon. (Can you see how the groups attached to it are all chemically different?)
In each of the chiral molecules below, identify all the carbons that are chiral carbons by drawing a circle
around each one of them.
(a) the carbohydrate glucose
H
O
(b) the carbohydrate fructose
CH₂OH
1C
H-C-OH
3
HO-C-H
4
H-C-OH
5
H-C-OH
6CH₂OH
D-Glucose
(linear form)
(c) the amino acid leucine
O
O
H3C.
HO H
H-
-OH
CH 3 NH2
H-
-OH
CH₂OH
OH
We always include controls in the Annexin-V-GFP/Propidium Iodide flow cytometric assay to study apoptosis. List four types of controls in this assay.
Why do we need these controls? Explain your answers.
After the flow assay, if we like to examine the morphology of the viable, early apoptotic and late apoptotic cells by confocal microscopy, what can we do and what are the expected results?
3. (2 points) Your lab partner accidentally used a pen instead of a pencil to mark the baseline and label the
lanes of their TLC plate. Briefly (1-2 sentences for each point) describe (a) what would happen to the ink
when you develop the TLC plate; and (b) how this would affect the experiment.
1
Chapter 23 Solutions
BIOCHEMISTRY II >CUSTOM<
Ch. 23 - Prob. 1PCh. 23 - Determining the Amount of ATP Produced from Fatty...Ch. 23 - Prob. 3PCh. 23 - Examining the Labeling of Glucose from 14C.labeled...Ch. 23 - Prob. 5PCh. 23 - Prob. 6PCh. 23 - Prob. 7PCh. 23 - Prob. 8PCh. 23 - Prob. 9PCh. 23 - Prob. 10P
Ch. 23 - Prob. 11PCh. 23 - Understanding Human Energy Consumption During...Ch. 23 - Prob. 13PCh. 23 - Prob. 14PCh. 23 - Prob. 15PCh. 23 - Extending the Mechanism of Methylmalonyl-CoA...Ch. 23 - Prob. 17PCh. 23 - Prob. 18PCh. 23 - Prob. 19PCh. 23 - Understanding a Ubiquitous Series of Metabolic...Ch. 23 - Using the ActiveModel for enoyl-CoA dehydratase,...
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- Do schwann cells produce or act as myelin in the peripheral nervous system? I know that they encase and wrap around axons, but where does the myelin come into play?arrow_forwardThe enzyme lactate dehydrogenase (LDH) catalyzes the conversion of pyruvate to lactatein skeletal muscle cells using NAD/NADH during anaerobic “balanced” fermentation.Answer the following questions about this reaction. (a) Write out the two reductive half reactions and indicate the E ̊' for each half reaction. Write out the full balanced reaction for the pyruvate to lactate rxn and indicate the ∆E ̊' for the reaction. (b) What is the free energy change under standard state conditions for thisreaction? Which direction is spontaneous?(c) Assume that in skeletal muscle cells the ratio of [NAD+] to [NADH] is 100, and that the[pyruvate] = 0.40 mM and [lactate] = 4.0 mM. What is the free energy change (∆G')for the conversion of pyruvate to lactate? Indicate the direction in which the reactionis spontaneous under these cellular conditions.arrow_forwardWhy did the authors worry about the temperature-dependent solubility of the carriers in thebilayer? How did the authors determine whether the effect of freezing the lipid bilayer wasto decrease the solubility of the carriers (nonactin and valinomycin) or whether the effectwas to impair their ability to diffuse through the membrane (decrease their mobility)?arrow_forward
- Kranse et. al. measured the temperature dependence of conductance using membranescontaining the phospholipids glyceryl dipalmitate and glyceryl distearate. Describe themodifications in membrane content that you would employ to: (a) shift the temperature of the phase transition (b) make the ion conductance curve for valinomycin andnonactin more like that of gramicidinarrow_forwardObtain the sequence for the 5-HT receptor HTR1A and generate a hydropathy plot usingthe ExPASY tool ProtScale, the appropriate window, and the Kyte-Doolittle weightingalgorithm. How many transmembrane domains are present in this receptor? Attach yourhydropathy plot to your assignment.arrow_forwardCompare and contrast the structural features of the ion carrier valinomycin with those of achannel former like gramicidin. How does structural information help explain the mechanismby which these molecules conduct ions across membranes?arrow_forward
- A typical integral membrane protein has a stretch (or stretches) of ~20 hydrophobic aminoacids that form an α-helix that spans the bilayer (as is found in membrane proteins such asglycophorin A and bacteriorhodopsin). Compare and contrast the molecular and structural features of gramicidin with a membrane-spanning α-helix. Explain how gramicidin can forman ion channel when a typical membrane-spanning α-helix cannot (eg, glycophorin A).arrow_forwardThe titration curve of alanine shows the ionization of two functional groups with pK values of 2.34 and 9.69, corresponding to the ionization of the carboxyl and the protonated amino groups, respectively. The titration of di-, tri-, and larger oligopeptides of alanine also shows the ionization of only two functional groups, although the experimental pK values are different. The table summarizes the trend in pK values. Amino acid or peptide Ala Ala-Ala pKj pk₂ 2.34 9.69 3.12 8.30 Ala-Ala-Ala 3.39 8.03 Ala-(Ala)-Ala, n ≥ 4 3.42 7.94 Modify the molecules to show the oligopeptide Ala-Ala-Ala. You can modify the molecules by moving, adding, deleting, or changing atoms, bonds, or charges. C Select c Draw Templates More H с N 0 S Cl H H | | || H CH3 H CH, H CH₂ Complete the statements about the the pK, values of the Ala-Ala-Ala oligopeptide. The pK₁ value of 3.39 is associated with the -COO group of Ala-Ala-Ala. The pK2 value of 8.03 is associated with the -NH group of Ala-Ala-Ala. Erase Q2 Q…arrow_forwardFacts from the bacterium mals and to dept kan apa in a peptide with antidic properties. This peptide complex with the call membrance of other hacterial species, leading in bacterial death The structure of the peptide has been determined from (a) Cmplete acid hydes of the peptide, followed by amino acid analys, yielded quiar anunt of Lan, Om, Pfx, Prxa, and Wall Cmtiti, an amino acid od prosentin pockets but present in some peptides. Com has the tracture H *H,N-CH-CH-CH, -C- COO (b) The weight of the peptide in approximately 1,200 Th (c) The peptide failed to undergo hydrolysis when treated with the Hydrolysis of the carbonyl-terminal residue of a polypeptide une "NH, the year. This call there Pro or the police does not contain a froz (d) Treatment of the peptide with 1-haw-2,4-dicherer (11N1), followed by complete hydrolysis and ched only from and the derivative NO, Н ON NHCHI CH, CH, C coo +NH, (Hint: The 2,4-diphenyl derivative involves the amino group of a side chain rather than the…arrow_forward
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