Biochemistry 410/411 Textbook - 5th Edition - Custom Texas A&M University
5th Edition
ISBN: 9781119302940
Author: Voet
Publisher: WILEY C
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Chapter 25, Problem 3E
Summary Introduction
To determine: The effect of a newly discovered DNA synthesis that inhibits the activity of inorganic pyrophosphatase.
Introduction: Inorganic pyrophosphatase is otherwise called as phosphatase, which is an enzyme that acts as a catalytic agent for the conversion of one pyrophosphate molecule into two phosphate ion molecules. Activity of this enzyme is essential in many cellular
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Extracts from the bacterium Bacillus brevis contain a peptide with antibiotic properties. This peptide forms complexes with
metal ions and seems to disrupt ion transport across the cell membranes of other bacterial species, leading to bacterial death.
The structure of the peptide has been determined from a series of observations.
(a) Complete acid hydrolysis of the peptide, followed by amino acid analysis, yielded equimolar amounts of Leu, Orn, Phe, Pro,
and Val. Orn is ornithine, an amino acid not present in proteins but present in some peptides. Orn has the structure
H
'H,N-CH,
-
CH2 CH2 CH2 -
C - COO-
NH,
(b) The molecular weight of the peptide is approximately 1,200 Da.
(c) The peptide failed to undergo hydrolysis when treated with the enzyme carboxypeptidase. This enzyme catalyzes the
hydrolysis of the carboxyl-terminal residue of a polypeptide unless the residue is Pro or the peptide does not contain a free
carboxyl group.
(d) Treatment of the intact peptide with…
At a pH equal to the isoelectric point (pl) of alanine, the net charge of alanine is zero. Two structures can be drawn that have a
net charge of zero, but the predominant form of alanine at its pl is zwitterionic.
CH3
H,N
CH3
**
H¸N-C
H
Zwitterionic
H
Uncharged
OH
Select statements that explain why alanine is predominantly zwitterionic at its pl.
pk of alanine's amino group is more than its pl.
pk of alanine's carboxyl group is more than its pl.
PK of alanine's carboxyl group is less than its pl.
pk of alanine's amino group is less than its pl.
Correct Answer
What fraction of alanine is in the completely uncharged form at its pl?
1 in 2.2 × 107
1 in 1.6 × 10²
1 in 4680
1 in 9460
How does a voltage-gated sodium channel work? Specifically, how and why does a change in voltage trigger their opening? Please be detailed
Chapter 25 Solutions
Biochemistry 410/411 Textbook - 5th Edition - Custom Texas A&M University
Ch. 25 - Prob. 1ECh. 25 - Prob. 2ECh. 25 - 3. You have discovered a drug that inhibits the...Ch. 25 - Prob. 4ECh. 25 - Prob. 5ECh. 25 - Prob. 6ECh. 25 - Prob. 7ECh. 25 - Prob. 8ECh. 25 - Prob. 9ECh. 25 - Prob. 10E
Ch. 25 - Prob. 11ECh. 25 - Prob. 12ECh. 25 - Prob. 13ECh. 25 - Prob. 14ECh. 25 - Prob. 15ECh. 25 - Prob. 16ECh. 25 - Prob. 17ECh. 25 - Prob. 18ECh. 25 - Prob. 19ECh. 25 - Prob. 20ECh. 25 - Prob. 21ECh. 25 - Prob. 22ECh. 25 - 23. Certain sites in the E. coli chromosome are...Ch. 25 - Prob. 24ECh. 25 - Prob. 25ECh. 25 - Prob. 26ECh. 25 - Prob. 27ECh. 25 - Prob. 28ECh. 25 - Prob. 29ECh. 25 - Prob. 30ECh. 25 - Prob. 31ECh. 25 - Prob. 32ECh. 25 - Prob. 33ECh. 25 - Prob. 34ECh. 25 - Prob. 35CQCh. 25 - Prob. 36CQCh. 25 - Prob. 37CQCh. 25 - Prob. 38CQCh. 25 - Prob. 39CQCh. 25 - Prob. 40CQCh. 25 - Prob. 41CQCh. 25 - Prob. 42CQCh. 25 - 43. Deinococcus radiodurans, which the Guinness...Ch. 25 - Prob. 44CQCh. 25 - Prob. 1MTE
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- Calculate the standard change in Gibbs free energy, AGrxn, for the given reaction at 25.0 °C. Consult the table of thermodynamic properties for standard Gibbs free energy of formation values. NH,Cl(s) →NH; (aq) + C1 (aq) AGrxn -7.67 Correct Answer Determine the concentration of NH+ (aq) if the change in Gibbs free energy, AGrxn, for the reaction is -9.27 kJ/mol. 6.49 [NH+] Incorrect Answer kJ/mol Marrow_forwardWhat are some topics of interest that neurotoxicologists study? For example, toxin-induced seizures, brain death, and such along those lines?arrow_forwardCould you help me with the explanation of the answer to exercise 15, chapter 1 of Lehinger Question Nombramiento de estereoisómeros con dos carbonos quirales utilizando el sistema RS(R,R)El isómero del metilfenidato (Ritalin) se utiliza para tratar el trastorno por déficit de atención con hiperactividad (TDAH).(S,S)El isómero es un antidepresivo. Identifique los dos carbonos quirales en la siguiente estructura. ¿Es este el(R,R)o el(S,S)¿isómero? Dibuja el otro isómero. Nombramiento de estereoisómeros con dos carbonos quirales utilizando el sistema RS(R,R)El isómero del metilfenidato (Ritalin) se utiliza para tratar el trastorno por déficit de atención con hiperactividad (TDAH).(S,S)El isómero es un antidepresivo.arrow_forward
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