Trp operon - Study guides, Revision notes & Summaries
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BIOL 2117 Exam 3 Questions and Answers
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What types of enzymes are typically constitutively expressed? 
Ans- enzymes in constant demand 
In an experiment exploring the expression of DNA repair enzymes, phage 
exposed to UV light had low infectivity, but when both phage and host cell E. 
coli were exposed to UV light, normal levels of infectivity resulted. From these 
data we can infer 
Ans- host cell genes were used to repair phage DNA 
The lacZ gene was used in an experiment testing for the expression of gene X. 
About half the re...
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BIO 111 FINAL EXAM QUESTIONS AND ANSWERS LATEST 2024/2025 (100% CORRECT)
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BIO 111 FINAL EXAM QUESTIONS AND ANSWERS LATEST 2024/2025 (100% CORRECT) What is the first mRNA processing step? - ANSWER 5' capping 
Different mRNAs are made from the same initial pre-mRNA by ________. - ANSWER 
alternative splicing 
RNA transcription begins at a ________. - ANSWER promoter 
________ protect(s) the pre-mRNA molecule. - ANSWER the 3' poly-a tail 
The process of pre-mRNA splicing removes ________. - ANSWER introns 
Spliced ________ differ in their exons. - ANSWER mRNAs 
Identif...
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Trp Operon Exam Latest Update
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Trp Operon Exam Latest Update ...
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Genetic, Evolution, & Ecosystems OCR 47 Review Summary Questions 2024
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19.1 Discuss why beneficial mutations are rare & suggest a process that beneficial mutations underpin (4 MARKS) - ️️Majority of mutations are silent (1); idea that random change to protein structure is more likely to reduce function (1); idea that beneficial mutations increase chances of survival if environment changes (1); surviving organisms reproduce and pass new alleles to offspring (1); leading to evolution (1) 
19.1 Outline why majority of mutations do not have an influence phenotype (...
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BSC 219 Final (All Correctly Answered)
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You discover a new bacterial operon that is induced by the presence of lead. You find a mutation that results in a mutation in the operator that changes the binding sequence so that the repressor is always bound to it. Would this mutation be rescued by a plasmid with a wild type copy of the operon and why? correct answers Yes, because the repressor would still be able to bind to the operator in the plasmid allowing for normal expression from the plasmid 
 
Why is it difficult to find a treatment...
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BISC 261 Chapter 11 Test with Questions with 100% Correct Answers
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What is the LacZ enzyme? - Answer breaks down the disaccharide sugar D-lactose to the 
2 monosaccharides D-galactose and D-glucose (both will go into glycolysis) 
What does binding of repressors & activators do to the DNA molecule? - Answer 
physically change it 
How is the trp repressor an example of negative regulation of a repressible anabolic 
operon? - Answer * Low tryptophan levels, transcription of the entire trp operon occurs 
* High tryptophan levels bind to repressor, repression occurs...
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Biology 1000 – Principles of Biology ( BioS 115 Core II: Genetics) Exam Study Guide Questions With Answers.
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Biology 1000 – Principles of Biology ( BioS 115 Core II: Genetics) Exam Study Guide Questions With Answers. Explain the concepts of penetrance and expressivity 
Penetrance is the percentage of cases in which a certain phenotype is expressed. There 
are two types: 
i. Complete Penetrance: when 100% is correlated to the genotype. So, all express 
the same thing. 
ii. Incomplete: this is when some are identical, and others are different. 
Penetrance= # with genotype showing phenotype x 100 
# wit...
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BIO 111 FINAL EXAM QUESTIONS AND ANSWERS LATEST UPDATED 2024/2025 | 100% CORRECT
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What is the first mRNA processing step? - ANSWER 5' capping 
Different mRNAs are made from the same initial pre-mRNA by ________. - ANSWER 
alternative splicing 
RNA transcription begins at a ________. - ANSWER promoter 
________ protect(s) the pre-mRNA molecule. - ANSWER the 3' poly-a tail 
The process of pre-mRNA splicing removes ________. - ANSWER introns 
Spliced ________ differ in their exons. - ANSWER mRNAs 
Identify the three phases of transcription. - ANSWER initiation, elongation, 
te...
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Genetics Exam 2 practice exam 107 Questions with Verified Answers,100% CORRECT
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Genetics Exam 2 practice exam 107 Questions with Verified Answers 
 
In five Hfr strains, each of which was used to build a time-of-entry map, the genes entered the recipient cells as follows: 
Strain 1: S L A C T F 
Strain 2: N P F T C A 
Strain 3: T F P N U Y 
Strain 4: S H Y U N P 
Strain 5: U N P F T C 
Which of the following represents a correct compilation of these results? 
A) S L A C T F P N H C U 
B) N P F T S L A C H U T 
C) T C A L S P N U Y H 
D) U N P F T C A L S T F 
E) S L A C T F...
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BIO 214 EXAM 3 Practice EXAM 57 Questions with Verified Answers,100% CORRECT
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BIO 214 EXAM 3 Practice EXAM 57 Questions with Verified Answers 
 
In the lac operon, CAP binding to the CAP site of the promoter ____. 
a. occurs when glucose is present 
b. inhibits RNA polymerase from binding to the promoter 
c. occurs when cAMP is absent 
d. helps the repressor protein bind to the operator 
e. enables RNA polymerase to transcribe the operon's genes - CORRECT ANSWER enables RNA polymerase to transcribe the operon's genes 
 
Gene regulation in both prokaryotes and eukaryotes...
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