Bacterial Genetics and Mutations Quiz

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Questions and Answers

What results from two adjacent thymines becoming covalently linked?

  • Reduction in mutation rates
  • Increased DNA replication speed
  • Enhanced genetic diversity
  • Thymine dimers, Stalled DNA replication and transcription (correct)

Which method of genetic contribution involves horizontal gene transfer?

  • Crossing over
  • Independent assortment
  • Transformation (correct)
  • Sexual reproduction

What do we call the ability of a bacterium to take in donor DNA?

  • Competency (correct)
  • Transformation efficiency
  • Plasmid integration
  • Transduction

What is the role of a conjugation pilus in bacteria?

<p>To facilitate DNA transfer between cells (C)</p> Signup and view all the answers

What type of mutation is primarily caused by frameshifts?

<p>Insertion or deletion mutation (A)</p> Signup and view all the answers

Which of the following is NOT a method by which asexual prokaryotes achieve genetic diversity?

<p>Meiosis (B)</p> Signup and view all the answers

What is characteristics of generalized transduction?

<p>Random bacterial DNA is packaged inside a virus (A)</p> Signup and view all the answers

What defines F+ cells in the context of bacterial conjugation?

<p>They contain fertility factor plasmid (B)</p> Signup and view all the answers

What distinguishes a haploid organism from a diploid organism in terms of chromosome copies?

<p>A haploid has only one copy of each chromosome. (A)</p> Signup and view all the answers

Which process directly converts genetic information from DNA to proteins?

<p>Translation (A)</p> Signup and view all the answers

During DNA replication, which enzyme is responsible for unzipping the DNA strands?

<p>Helicase (B)</p> Signup and view all the answers

What type of mutation arises from a change in a single nucleotide?

<p>Point mutation (D)</p> Signup and view all the answers

In prokaryotes, which mechanism is crucial for genetic diversity?

<p>Horizontal gene transfer (B)</p> Signup and view all the answers

What is the primary role of DNA gyrase in bacterial replication?

<p>It relaxes supercoiled DNA strands. (D)</p> Signup and view all the answers

Which of the following best describes the semiconservative model of DNA replication?

<p>Each new DNA molecule contains one original strand and one new strand. (C)</p> Signup and view all the answers

Which codon type is most likely modified as a result of a point mutation?

<p>Sense codons (B)</p> Signup and view all the answers

What is a common effect of mutations caused by mutagens?

<p>Altered protein functions (A)</p> Signup and view all the answers

Which process ensures minimal errors during the vertical transfer of genetic material?

<p>DNA replication accuracy (A)</p> Signup and view all the answers

Which type of mutation involves the insertion or deletion of nucleotides, leading to a shift in the reading frame?

<p>Frameshift mutation (D)</p> Signup and view all the answers

What effect can a point mutation have on a protein?

<p>It can lead to a change in a single amino acid. (B)</p> Signup and view all the answers

Which of the following is true about mutagens?

<p>Mutagens can be physical, chemical, or biological agents. (B)</p> Signup and view all the answers

Which scenario could lead to increased genetic diversity in prokaryotes?

<p>Horizontal gene transfer (A)</p> Signup and view all the answers

What is a characteristic of spontaneous mutations?

<p>They occur in the absence of a mutagen. (C)</p> Signup and view all the answers

What is the primary function of RNA primase during DNA replication?

<p>To provide a free 3’ OH end for DNA polymerase (A)</p> Signup and view all the answers

What distinguishes the leading strand from the lagging strand in DNA replication?

<p>The leading strand is synthesized continuously (C)</p> Signup and view all the answers

Which enzyme is responsible for sealing gaps after RNA primer removal in eukaryotic DNA replication?

<p>Ligase (B)</p> Signup and view all the answers

In prokaryotes, what is the rate of nucleotide addition during replication?

<p>1000 nucleotides/second (D)</p> Signup and view all the answers

How many origins of replication are found in eukaryotic chromosomes compared to prokaryotic chromosomes?

<p>Multiple in eukaryotes, one in prokaryotes (B)</p> Signup and view all the answers

What is the primary role of DNA polymerase I in prokaryotic replication?

<p>To remove RNA primers (C)</p> Signup and view all the answers

Which of the following accurately characterizes the structure of prokaryotic genomes?

<p>Single circular chromosome (A)</p> Signup and view all the answers

What is the function of topoisomerase IV in prokaryotic DNA replication?

<p>To reseal concatenated chromosomes (B)</p> Signup and view all the answers

Which form of DNA polymerase is responsible for synthesizing the leading strand in eukaryotes?

<p>DNA polymerase epsilon (B)</p> Signup and view all the answers

What distinguishes Okazaki fragments during lagging strand synthesis?

<p>They necessitate new primers for each fragment (B)</p> Signup and view all the answers

What occurs when the F plasmid integrates into the chromosome?

<p>The cell becomes an Hfr cell (B)</p> Signup and view all the answers

Which of the following statements about transposons is true?

<p>They can excise and integrate into new DNA locations. (A)</p> Signup and view all the answers

What is the role of a repressor in gene regulation?

<p>Blocks RNA polymerase from binding to the promoter. (D)</p> Signup and view all the answers

What is a characteristic feature of the operon model of gene expression?

<p>It includes both promoter and operator segments. (A)</p> Signup and view all the answers

What type of mutations do transposons mainly promote in prokaryotes?

<p>Frameshift mutations (C)</p> Signup and view all the answers

How do prototypical operons differ in prokaryotes compared to eukaryotes?

<p>Prokaryotic operons can generate polycistronic transcripts. (A)</p> Signup and view all the answers

What defines an inducible operon, such as the lac operon?

<p>It can be turned off by a repressor binding to its operator. (A)</p> Signup and view all the answers

What role do inducers play in gene regulation?

<p>They activate or repress transcription through regulatory factors. (C)</p> Signup and view all the answers

Which of the following describes the primary reason for gene regulation in prokaryotes?

<p>To ensure efficient use of cellular resources. (A)</p> Signup and view all the answers

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