Lactose operon Samenvattingen, Notities en Examens

iology 1000 – Principles of Biology ( BioS 115 Core II: Genetics) Exam Study Guide. 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 # with the genotype Expressi...

BIOL 3025 STUDY GUIDE TEST. The lac operon is expressed when A) glucose is high and lactose is absent. B) glucose is low and lactose is absent. C) glucose is low, regardless of the presence or absence of lactose. D) glucose is high and lactose is present. E) glucose is low and lactose is present. - CORRECT ANSWER E When in a complex with ________, the CAP protein binds to the CAP site and ________ the expression of the lac operon. A) glucose ; switches on B) lactose ; switches on ...

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...

GCU BIO 181 FINAL EXAM (EXAM 4)The tryptophan operon is a repressible operon that is: - correct answer Turned off whenever tryptophan is added to the growth medium. The lactose operon is likely to be transcribed when: - correct answer The cyclic AMP and lactose levels are both high within the cell. For a repressible operon to be transcribed, which of the following must occur? - correct answer RNA polymerase must bind to the promoter, and the repressor must be inactive. Which of the foll...

All cells that make up an organism contain the exact same DNA sequence (genome) however individual cell-types look and function very differently. Why? Correct Answer-each cell-type expresses a unique set of genes of the genomic DNA. Speaking of genotype and phenotype how are these terms defined? Correct Answer-the genotype defines the genetic information (gene) and the phenotype the outcome of gene expression. Which of the following describes a functional gene? Correct Answer-a gene is def...

CBE 235 Final Question and answers rated A+ 2023/2024 Lac Operon - correct answer -involved in heating lactose: inducible operon 1) The lactose repressor protein coded by Lacl bound to the operator tightly near the mRNA start site, blocking the ability of RNA poly to bind 2) Lactose introduced--> Lac repressor binds to lactose and changes conformation such that it can no longer bond to the operator 3) RNA poly can access the promoter and transcription goes 4) LacZ,LacY,LacA are transcribe...

BIO 1A03 TEST 2 QUESTIONS AND ANSWERS ALREADY PASSED The lacZand lacY genes are transcribed when a) lactose is absent and glucose levels are high. b)lactose is present and glucose levels are low. c)lactose is present, regardless of the level of glucose in the cell. d) glucose levels are low, regardless of the level of lactose in the cell. b) The CRP-cAMP complex binds the lactose operon when a) glucose levels and cAMP levels are low. b) glucose levels are high and cAMP levels are low. c)...

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 # with the genotype Expressivity is the type or degree to which a penetrant gene ( the genes carrying the mutatio...

What will be the effect on transcription when an inhibitor is in play? A. Allow transcription B. Prevent transcription - Answer-B Explanation: An inhibitor prevents activator from binding to DNA; activators are used in positive regulation (increasing transcription) - thus, the inhibitor prevents the activator from positive regulating (increasing) transcription. What will be the effect on transcription when an inducer is in play? A. Allow transcription B. Prevent transcription - Answer-A Ex...

What will be the effect on transcription when an inhibitor is in play? A. Allow transcription B. Prevent transcription - Answer-B Explanation: An inhibitor prevents activator from binding to DNA; activators are used in positive regulation (increasing transcription) - thus, the inhibitor prevents the activator from positive regulating (increasing) transcription. What will be the effect on transcription when an inducer is in play? A. Allow transcription B. Prevent transcription - Answer-A Ex...