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bacterial cell needs to synthesize arginine if it is absent in the environment. If arginine is present in its diet, however, the cell will activate a repressor protein which blocks transcription of the genes that code for the enzymes that synthesize arginine. This is an example of which type of regulation?
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- Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Terms can be used once, more than once, or not at all. Submit dCTP GMP AMP GTP dTTP activation inhibition dGTP My Answers Give Up UTP + Gln + ATP → CTP + Glu+ ADP + P₁. Cofactor: dCMP + H₂O →→→→DUMP + NH3. Cofactor: CDP+ [2H] → dCDP+ H₂O. Cofactor: Effect: Effect: Effect: Reset HelpWhich of the follow general transcription factors contains the protein TBP and binds to TATA box promoters first? Group of answer choices TFIID TFIIB TFIIA TFIIFgene normally contains an N' terminal ER signal sequence and an internal stop transfer sequence. The ER signal sequence is recognized and used during the protein trafficking process, as normal. After translation is completed a signal peptidase enzyme cleaves the N' ER signal sequence but the internal sequence is not cleaved. Which of the following figures best represents the orientation of the protein product after translation? N Extracellular Extracellular Extracellular Extracellular -N' C' N Lumen Lumen Lumen Lumen N' A В C
- Protein activity is controlled by multiple mechanisms in the cell. Briefly describe how this type of protein control is used in the cell and if this is an example of pre- or post-translational control. Allosteric activationWhich of the following applies best to post-translational control? Question 13 options: regulation of gene expression after transcription regulation of gene expression after translation control of epigenetic activation period between transcription and translationAn E. coli cell as the following genotype for the lac operon system: I- OC Z+ / F’ I+. Which term best describes the regulation of expression of the beta galactosidase in this cell? Group of answer choices Inducible None of these Activated Always repressed Constitutive
- Describe the advantages and disadvantages of the following mechanisms of regulation: Transcriptional control Translational control Post translational controlATP and GTP play a few roles during transcription and translation. What are two roles that ATP plays and one role that GTP plays? GO S x2 x2 i T: B IWhat is the smallest number of molecules of ATP and GTP consumed in the synthesis of a protein with 200 residues after mRNA synthesis, starting from amino acids? Assume that the hydrolysis of PP; is equivalent to the hydrolysis of ATP for this calculation. number of ATP molecules: number of GTP molecules: 400 800 Incorrect
- Indicate (x) if the following statements about synthesis of proteins containing an ER signal sequence are True or False: True False i. Translation is initiated by ribosomes located on the ER membrane The signal recognition particle (SRP) binds a sequence of nonpolar (hydrophobic) amino acids. ii. iii. The ER signal sequence may be cleaved by signal peptidase on the cytoplasmic side of the ER membrane. iv. The part of a transmembrane protein that will ultimately be located outside of the cell is inserted into the lumen of the ER during translation. A stop transfer sequence is a series of polar amino acids that halts translocation of a newly synthesized peptide into the ER lumen.Create a metabolism cocept map using these terms RepressorInducer RiboswitchRepression InductionPositive regulationActivatorOperator Heat shocklac operontrp operon Catabolite RepressionHeat shocksigma-32 Negative regulationTwo-component regulationSensor Kinase Autoinducing Peptide (AIP)Response regulatorSigma factorsFeedback inhibitionProtein StabilityQuorum SensingRNA regulationAntisense RNAHomoserine Lactone (AHL)Usually found in prokaryotes, regulatory sequences lying adjacent to the DNA being transcribed are composed of a promoter located next to a(n) ____ that interacts and is controlled by regulatory protein. TATA box rho binding domain RNA polymerase holoenzyme operator