10.2: Mechanisms of Microbial Genetics
- Page ID
- 42530
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)- 10.2.1: What Are Genes?
- This page covers the central dogma of molecular biology, detailing the flow from DNA to RNA to protein, and explains the distinction between genotype and phenotype. It highlights gene regulation in prokaryotes through operons, which can be constitutive or regulated by environmental factors. The page also touches on ethical issues regarding genome sequencing in healthcare.
- 10.2.2: Structure and Function of RNA
- This page explores the structure and functions of RNA, highlighting its differences from DNA. It explains that RNA is usually single-stranded and consists of ribonucleotides, playing essential roles in protein synthesis through its three types: mRNA, rRNA, and tRNA. Each type has unique functions, from transporting genetic information to facilitating protein assembly. Additionally, RNA can function as hereditary material in some viruses, underscoring its broader biological importance.
- 10.2.3: RNA Transcription
- This page covers two main topics: the transcription process of RNA from DNA, detailing the differences between prokaryotic and eukaryotic systems, including RNA polymerase functions and mRNA characteristics; and a clinical case of a patient, Mark, diagnosed with necrotizing fasciitis who receives antibiotics but shows no improvement, prompting an exploration of infection causes and treatment failures.
- 10.2.4: Protein Synthesis (Translation)
- This page covers the genetic code and translation process vital for protein synthesis, highlighting the universal nature of codons and their redundancy. It examines differences in translation between prokaryotes and eukaryotes, including initiation mechanisms and ribosomal structures (70S vs. 80S). Nonsense codons lead to polypeptide release, and post-translational modifications are crucial for activating proteins.
- 10.2.5: Mutations
- This page covers mutations as heritable DNA changes affecting phenotype, detailing point and frameshift mutations such as missense, nonsense, and silent mutations. It explores causes, including spontaneous errors and mutagens, and explains how certain agents induce mutations, alongside DNA repair mechanisms. The identification of auxotrophic mutants and the Ames test for assessing mutagenicity and carcinogenicity are also discussed, highlighting the interaction of genetics and health.
- 10.2.6: How Asexual Prokaryotes Achieve Genetic Diversity
- This page covers horizontal gene transfer (HGT) in prokaryotes, emphasizing its mechanisms: transformation, transduction, and conjugation. It explains how HGT enhances genetic diversity and contributes to pathogenicity and antibiotic resistance. The conjugation process in E. coli is detailed, highlighting the roles of the F plasmid and transposons in gene transfer and adaptation.
Thumbnail: DNA Double Helix. (Public Domain; Apers0n).