127. Whicn of the following statement concerning the regulator gene (i) associated with the lac operon is correct ? (1) mRNA is transcribed from the i-gene whether lactose is present or not. (2) MRNA is transcribed from the i-gene only when lactose is not present (3) Lactose inhibit the synthesis of mRNA from i-gene (4Y Lactose promotes the synthesis of MRNA from i-gene

127. Whicn of the following statement concerning the regulator gene (i) associated with the lac operon is correct ? (1) mRNA is transcribed from the i-gene whether lactose is present or not. (2) MRNA is transcribed from the i-gene only when lactose is not present (3) Lactose inhibit the synthesis of mRNA from i-gene (4Y Lactose promotes the synthesis of MRNA from i-gene

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter16: Gene Expression

Section: Chapter Questions

Problem 38CTQ: A scientist discovers a virus encoding a Protein X that degrades a subunit of the elF4F complex....

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42. Which term BEST describes the process of increasing mRNA production for a gene in response to a stimulus?
33. Which type(s) of proteins do(es) NOT interact with mediator?
(b) Hemoglobin is made of B-globin subunits. The first few mRNA nucleotides for B- globin are given by: (1) (iii) (iv) Write down the DNA sequence that has led to this mRNA and indicate the sense and non-sense strands and the polarity. CE Derive the polypeptide for the sequence using the table of the genetic code (Table Q1 below) and indicate the polarity of the polypeptide chain. First Position (5' end) U A single point mutation in mRNA sequence can cause sickle cell anemia by changing the amino acid Glu to Val. For the given mRNA, indicate the point mutations for the first Glu in the polypeptide sequence that can cause this disease. 5'-AUGGUCCACCUGACUCCUGAGGAGAAG...UGA-3' C The polypeptide of B-globin contains the amino acid Leu. Write down all the anticodons of the tRNA molecules that can potentially code for Val. Indicate the polarity of the anti-codon. A G Table 1. The Codons of the Genetic Code Second Position U Phe Phe Leu Leu Leu Leu Leu Leu Ile Ile Ile Met-Start Val Val Val…
5. a) Describe, using a diagram or point form notes, what is happening during transcription and translation of protein synthesis. Indicate where these events take place in the cell. b) An error occurs in the transcription of the original master strand of DNA. At the very first base pair, a guanine is substituted for cytosine. State the possible effects on the polypeptide and its functions.
A scientist discovers a virus encoding a Protein X that degrades a subunit of the elF4F complex. Knowing that this virus transcribes its own mRNAs in the cytoplasm of human cells, why would Protein X be an effective virulence factor?
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List the Pol II general transcription factors.
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(61) A 61-year old woman comes to the physician because of scarring acne vulgaris that has not been responsive to topical medication. Oral tetracycline is prescribed . Which of the following best explains the mechanism of action of this drug? (A) Blockage of DNA gyrase (B) Destruction of active transport membrane transport (C) Inhibition of aminoacyl-RNA binding to bacterial ribosomes (D) Interference with the action of peptidyl transferase (E) Interferance with translocation reaction
The RB (retinoblastoma) protein normally [ Select] ["keep a transcription factor in an inactive state", "keep a transcription factor in an active state", "keep the CDK in a phosphorylated state", "block the function of the APC"] ...But it can be deactivated by [ Select ] ["ubiquitination", "methylation", "phosphorylation", "the use of a GAP"] .Mutations in Rb can lead to cancer because these mutations [ Select ] ["result in constitutive transcription leading to promotion of the cell cycle", "keep CDKs off", "deactivate p53", "increase the production of growth hormones"] PLEASE SELCET THE CORRECT ONE FOR SECTION ONE . EACH SENTECNE HAVE 4 SECTION TO PICK FROM.
A segment of DNA has the followimg sequence of bases.. 5'-ATGCAATGATATTGAAGCTTA-3' a) What sequence of bases would appear in mRNA transcribed from this segment? b) Assume the first base in this mRNA is the beginning of a codon. What order of amino acid would be translated into a polypeptide synthesized along this segment? c) Give anticodons for each tRNA associated with the translation in part (b)
What are the functional consequences of this deletion for lilP mRNA transcription and translation? (100 words max.)