Operon bacteria - Study guides, Class notes & Summaries

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...

MIBO 3500 Exam 2 Questions and Answers Rated A frederick griffith studied streptococcus pneumoniae in mice - hypothesized that bacteria could "transfer" information to each other - S strain -> host death - R strain -> not fatal - pre-killing S strains prevents illness - killed S plus live R is fatal conjugation horizontal gene transfer requiring cell to cell contact - two cells brought together by pilus on the donor - relaxase assists in DNA transfer - requires presence of transferable ...

Bio 101 Chapter 7 Exam Questions and Answers All Correct A change in a cell's DNA sequence is Select one: a. transcription. b. a mutation. c. an operon. d. translation. e. replication. - Answer-b. a mutation A diploid cell only has two copies of most genes, but can make hundreds of copies of a protein from those genes per second because Select one: a. while transcription can repeat and make multiple mRNA copies of genes, and multiple ribosomes can translate the same mRNA. b. mul...

Which is the purpose of transfer RNA? - to bring amino acids to the ribosomes to be assembled into proteins During which process is mRNA synthesized from a DNA template with the aid of RNA polymerase? - transcription Which occurs during transcription? - mRNA is synthesized from a strand of DNA. What must first occur for transcription to begin? - RNA polymerase attaches to the promoter. Which does not occur during translation? - DNA is transcribed into a complementary strand of mRNA. Fra...

In bacteria, the sequence of bases in DNA that contains a promoter and one or more structural genes and often an operator or activator-binding site that controls their expression - Answer operon 1. A mechanism for the regulation of transcription termination of some bacterial operons by aminoacyl-tRNAs. 2. A procedure that reduces or abolishes the virulence of a pathogen without altering its immunogenicity - Answer attenuation

bacterial DNA 1-2 circular chromosomes, DNA is much longer than the cell, replicates right before binary fission, found in the cytoplasm Prokaryotic chromosomes circular, one origin of replication, 1000 nucleotides/second, primer removal = DNA polymerase 1, strand elongation = DNA polymerase III eukaryotic chromosomes multiple linear strands, have centromeres and telomeres, need to separate, multiple origins of replication, 100 nucleotides/second; primer removal = RNAse H; elongationpoly...

BIO110 PRACTICE EXAM 4|165 Questions with Verified Answers TRNA has a few loops in its structure, what loops connects to the mRNA codon? a. codon domain b. anticodon c. acodon d. amino acid - CORRECT ANSWER b. anticodon Catabolite activator protein: a. increases the affinity of the promoter region for RNA polymerase b. decreases RNA polymerase activity c. becomes nonfunctional when it binds to AMP d. binds and activates RNA polymerase e. blocks RNA polymerase access to the DNA tem...

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)...

OPENSTAX MICROBIOLOGY TEST BANK OpenStax Microbiology THIS TEST BANK COVERS ALL CHAPTERS 1-26 OF THE BOOK 1 An Invisible World 1.1 What Our Ancestors Knew 1.2 A Systematic Approach 1.3 Types of Microorganisms 2 How We See the Invisible World 2.1 The Properties of Light 2.2 Peering Into the Invisible World 2.3 Instruments of Microscopy 2.4 Staining Microscopic Specimens 3 The Cell 3.1 Spontaneous Generation 3.2 Foundations of Modern Cell Theory 3.3 Unique Characteristics of Prokaryotic Cells 3.4 ...

CBE 235 Final.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 transcribed Gregor Mendel Experiment - correct ...