1) Which of the following statements is NOT TRUE regarding the SOS or translesion repair pathway?
A) The distress signal involves an accumulation of single stranded DNA (ssDNA).
B) The LexA protein prevents transcription of the SOS response genes.
C) Activation of the RecA protein prevents the SOS response.
D) The DNA polymerases IV and V have a lower accuracy and thus increase mutation.
2) The DNA polymerases III, IV, and V interact with a beta clamp to increase DNA polymerase processivity.
True
False
1.The distress signal involves an accumulation of single-stranded DNA (ssDNA).
2.
The DNA polymerases III, IV, and V interact with a beta clamp to increase DNA polymerase processivity.
True
1) Which of the following statements is NOT TRUE regarding the SOS or translesion repair pathway?...
9. (5 pts, I preach) Circle all TRUE statements : (a). A transversion mutation generated during DNA replication must have had a purine-purine or a pyrimidine-pyrimidine pairing to occur. (b). In the ColEl plasmid copy control system, if one were to block RNA-1 transcription the copy number should decrease. (c) In E. coli UV light induces a higher mutation rate through induction of the SOS system. (d). RecA, LexA, and DNA polymerase I plays an essential role in activating the...
1) The SOS regulatory system is activated by _________________. a. repression of RecA b. the activity of DNA polymerase IV c. DNA damage d. transcription of LexA 2) During an infection of a host cell with a lytic virus, viral mRNA and proteins are synthesized in what phase of viral replication? a. Latent period b. Burst period c. Lag phase d. Exponential growth e. Attachment 3) A CRISPR system is a_______________________________________. a. none of these answers are correct b. DNA...
1. In eukaryotes, which DNA polymerase is primarily responsible for filling in the gaps in the DNA generated during base excision repair? DNA polymerase α DNA polymerase β DNA polymerase γ DNA polymerase ö DNA polymerase μ 2. High energy electromagnetic radiation includes which of the following? ultraviolet light x-rays gamma rays two of the above all three of the above 3. Which of the following types of damage to DNA cannot be caused by x-rays and gamma rays? deletions...
1. Which of the following statements about the flow of genetic information is true? a. Proteins encode information that is used to produce other proteins of the same amino acid sequence. b. RNA encodes information that is translated into DNA, and DNA encodes information that is translated into proteins. c. Proteins encode information that can be translated into RNA, and RNA encodes information that can be transcribed into DNA. d. DNA encodes information that is translated into RNA, and RNA...
Which of the following statements is true? A. RNA polymerase has a proofreading activity B. Prokaryotic RNA usually undergoes nuclear processing C. Polypeptides are synthesized by addition of amino acids to the amino terminus. D. The 3' end of mRNA corresponds to the carboxyl terminus of the protein. Grade 2. Which of the following A. It may be autocatalytic. B. Spliceosomes are present in organelles and nuclei C. It involves removal of exons is true regarding RNA processing? D. It...
Which of the following statements about transcription factor TFilh are correct Two of the record One subunit is a protein kinase that phosphorylates the RNA polymerase. All recorrect It is one of the last general transcription factors associated with RA polymerase enter the complex toto an active polymer One tunt wind a heativity the double stranded Deadur betrition Alarger S value for an RNA specifically indicates that the RNA migrates more rapidly through a field of force during centrifugation migrates...
Which of the following statements regarding the TATA binding protein (TBP) are true: Recognizes a sequence that is similar are identical to 5'TATAAA3' Ο Ο Ο All are correct. It is considered a universal transcription factor It is a part of TEIID protein complex It binds to a consensus sequence The backbone of a DNA molecule is made up of phosphate groups made up of sugars made up of alternating phosphate and sugar groups Made up of alternating sugars and...
answer all the questions
1) All of the following contribute to promoter binding by RNA polymerase I in bacteria except: a)-10 consensus sequence b)-35 consensus sequence c) rho factor d) sigma factor e) none of the above 2) Common structural changes or lesions found in DNA after exposure to ultraviolet light are: a) thymine dimers b) cytosine dimers c) purine dimers d) adenine dimers e) none of the above 3) What is the function of the sigma subunit in the...
1. Which of the following statements is FALSE? Helicase activity 'unwinds DNA making the double-stranded molecule into single strands. b. The leading strand of DNA is started by an RNA primer The lagging strand of DNA is synthesized as "Okazaki fragments", cach with its own RNA primer. DNA replication proceeds in both directions around the bacterial chromosome. DNA polymerase synthesives new DNA in one direction (3 to 5) only. 2. Which of the following would be found in eukaryotes? a....
QUESTION 1 A gene that encodes a protein that stimulates progression of the cell cycle is known as a proto-oncogene. True False QUESTION 2 Cytokinesis occurs after which stage or phase of the cell cycle? a. G2 b. S c. G0 d. G1 e. M phase QUESTION 3 During cell-cycle checkpoints, protein kinases known as CDKs phosphorylate target proteins only when they associate with a cyclin. True False QUESTION 4 During mitosis, many of the spindle fibers attach to chromosomes...