
Concept explainers
To calculate: The cellular concentration of the repressor protein.
Introduction: A repressor is a DNA binding or RNA binding molecule that binds with operator to inhibit the gene expression. DNA binding repressor inhibits the transcription as it block the promoter and prevent
To compare: The cellular concentration of repressor protein with dissociation constant of the repressor-operator complex.
Introduction: The required number of repressor molecule to fill the half of operator site is defined by dissociation constant. The numbers of active repressor in the cell are the number of repressor molecule which always bound to operator site.
To explain: The significance of the answer in given data “repressor concentration E. coli”.
Introduction: The dissociation constant defines the required number of repressor molecule to fill the half of the operator site. The numbers of active repressor in the cell are the number of repressor molecule which always bound to operator site.

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Chapter 28 Solutions
Lehninger Principles of Biochemistry
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- An organic chemist ordered the wrong item. She wanted to obtain 1-hydroxy-2-butanone, butinstead ordered 2-hydroxybutyraldehyde. As a good biochemist, show how the organic chemistcould use biological catalysis to make her desired compound. Please show the mechanism by drawing.arrow_forwardShow the fate of the hydrogen on carbon-2 of glucose. Please draw out the structure using curve arrows to show electron flow.arrow_forward3. Which one of the compounds below is the major product formed by the reaction sequence shown here? CH3 + CH3NO2 NaOH H2, Ni ? nitromethane acetophenone OH OH HO HN- u x x x x Ph A HO -NH2 HO H Ph Ph Ph N- H B Ph NH2 D Earrow_forward
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- CH3CH2CHO + propanal PhCH2CHO 2-phenylacetaldehyde mixture of four products NaOH 10. In the crossed aldol reaction of propanal and 2-phenylacetaldehyde shown above, a mixture of four products will be formed. Which ONE of the compounds below will NOT be formed in this crossed aldol reaction? OH Ph A H OH OH Ph H B OH OH H H H Ph Ph C Ph D Earrow_forwardAn organic chemist ordered the wrong item. She wanted to obtain 1-hydroxy-2-butanone, butinstead ordered 2-hydroxybutyraldehyde. As a good biochemist, show how the organic chemistcould use biological catalysis to make her desired compound.arrow_forwardPredict the products of aldolase catalyzing the reaction with acetone and (S)-3-hydroxybutyraldehyde.arrow_forward
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