Virology: Negative and Positive Sense RNA Viruses
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Questions and Answers

What is the primary function of RNA replicase in negative sense viruses?

  • To synthesize the complimentary RNA strand (correct)
  • To transcribe the viral mRNA
  • To replicate the viral genome
  • To translate the viral genome directly into proteins

What is the main difference between positive and negative sense viruses?

  • The presence of a cell wall
  • The type of cells they infect
  • The ability to be directly translated by the host cell's ribosomes (correct)
  • The type of enzymes they carry

What is the primary component of the Gram Positive cell wall?

  • thick layer Peptidoglycan (correct)
  • Lipopolysaccharides
  • Lipoteichoic acid
  • thin layer Peptidoglycan

What is the characteristic of Gram Negative bacterial cell walls?

<p>A thin layer of peptidoglycan and an outer membrane (C)</p> Signup and view all the answers

How do bacteria use the Electron Transport Chain?

<p>They use their own cell membrane to house the ETC enzymes (C)</p> Signup and view all the answers

What is a characteristic of Eukaryotic cell walls?

<p>They do not have peptidoglycan (A)</p> Signup and view all the answers

What is the primary mechanism by which a lysosome digests its contents?

<p>It fuses its membrane with a carrier and injects hydrolytic enzymes (D)</p> Signup and view all the answers

What is the main difference between prokaryotic and eukaryotic ribosomes?

<p>Size of the subunits (A)</p> Signup and view all the answers

Why do cells that need a lot of energy have a high concentration of mitochondria?

<p>To generate more energy (A)</p> Signup and view all the answers

How does the environment in the nucleus compare to the environment in the rest of the cell?

<p>It is separate and distinct (D)</p> Signup and view all the answers

What is the characteristic of prokaryotic DNA?

<p>It is circular and found in the cytosol (D)</p> Signup and view all the answers

How do lysosomes typically interact with their targets?

<p>Through vesicle fusion (A)</p> Signup and view all the answers

What is the main function of the Smooth ER in terms of lipid synthesis?

<p>Synthesis of lipids such as phospholipids and steroids (C)</p> Signup and view all the answers

What is the role of the Cytoskeleton in the cell?

<p>To provide shape and structure to the cell (B)</p> Signup and view all the answers

Where are proteins synthesized into the Rough Endoplasmic Reticulum typically sent?

<p>The Smooth ER (C)</p> Signup and view all the answers

What is the function of the Golgi Apparatus?

<p>To receive materials from the ER and modify them (C)</p> Signup and view all the answers

What is the characteristic of Smooth ER that distinguishes it from Rough ER?

<p>It has no ribosomes in its membrane (D)</p> Signup and view all the answers

What is the path that materials take after leaving the Smooth ER?

<p>Smooth ER to the Golgi Apparatus (A)</p> Signup and view all the answers

What is the primary function of the nucleus in eukaryotic cells?

<p>To store genetic information and machinery (A)</p> Signup and view all the answers

What is the characteristic structure of flagella and cilia in eukaryotic cells?

<p>9 + 2 structure (C)</p> Signup and view all the answers

What is the restriction on bacterial conjugation?

<p>F+ Bacteria can only conjugate to F- Bacteria (D)</p> Signup and view all the answers

What is the stationary phase in bacterial growth?

<p>The phase where bacteria have reduced resources and can no longer grow as quickly (D)</p> Signup and view all the answers

What is the stroma composed of?

<p>Connective tissue (C)</p> Signup and view all the answers

What is the main difference between viral lysis and viral extrusion?

<p>Viral lysis kills the host cell, while viral extrusion does not (C)</p> Signup and view all the answers

Where does the modified material travel to after leaving the Golgi Apparatus?

<p>Its intended location inside or outside the cell (A)</p> Signup and view all the answers

What happens to the host cell in the Lytic cycle?

<p>It is destroyed and the viruses spread to new cells (A)</p> Signup and view all the answers

What is the purpose of the bacterial flagellum filament?

<p>To move the bacterium (D)</p> Signup and view all the answers

What is the result of the lysogenic cycle?

<p>The host genome incorporates the viral DNA (D)</p> Signup and view all the answers

What is the function of the Golgi Apparatus in the cell?

<p>To modify and transport proteins (A)</p> Signup and view all the answers

What occurs during the Log Phase of bacterial growth?

<p>The bacteria grow exponentially (B)</p> Signup and view all the answers

What is the primary function of RNA replicase in the host cell?

<p>To synthesize a complimentary RNA strand (A)</p> Signup and view all the answers

What is the primary difference between Gram Positive and Gram Negative cell walls?

<p>The thickness of the peptidoglycan layer in Gram Positive bacteria (C)</p> Signup and view all the answers

How do negative sense viruses ensure the synthesis of viral proteins?

<p>By synthesizing a complimentary RNA strand that can be translated (B)</p> Signup and view all the answers

What is the characteristic of positive sense viruses?

<p>The viral genome can be directly translated into proteins (C)</p> Signup and view all the answers

What is the function of the periplasmic space in Gram Negative bacteria?

<p>To house the electron transport chain enzymes (A)</p> Signup and view all the answers

What is the characteristic of the cell wall in Gram Positive bacteria?

<p>A thick layer of peptidoglycan and lipoteichoic acid (D)</p> Signup and view all the answers

What is the function of the cytoplasmic membrane in bacteria?

<p>To house the electron transport chain enzymes (C)</p> Signup and view all the answers

What is the characteristic of Eukaryotic cell walls?

<p>The absence of peptidoglycan and lipoteichoic acid (A)</p> Signup and view all the answers

What is the function of motor proteins like Kinesin and Dynein in relation to microtubules?

<p>To travel along microtubules and drag vesicles with them (A)</p> Signup and view all the answers

What characteristic do Archaea share with Eukaryotes?

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

What is the optional component of a virus?

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

What is the function of Centrioles during mitosis?

<p>To exert their effects during mitosis (D)</p> Signup and view all the answers

What is the purpose of adding Iodide in the Gram Stain process?

<p>To bind the crystal violet and trap it in the cell (D)</p> Signup and view all the answers

What is the characteristic of Archaea that allows them to thrive in extreme environments?

<p>Ability to employ chemosynthesis (B)</p> Signup and view all the answers

What is the primary component of microtubules?

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

What is the stage of bacterial growth where the growth rate slows down due to depletion of resources?

<p>Stationary Phase (D)</p> Signup and view all the answers

What is the primary function of centrioles in a cell?

<p>To organize microtubules during cell division (D)</p> Signup and view all the answers

What is the characteristic of a facultative anaerobe?

<p>It can switch between anaerobic and aerobic metabolism (B)</p> Signup and view all the answers

What is the primary function of histones in the nucleus?

<p>To organize DNA into chromatin structures (A)</p> Signup and view all the answers

What is the primary function of peroxisomes in a cell?

<p>To break down hydrogen peroxide (D)</p> Signup and view all the answers

What is the primary function of cilia in a cell?

<p>To move materials along the cell's surface (D)</p> Signup and view all the answers

What is the primary function of flagella in a cell?

<p>To propel the cell itself (B)</p> Signup and view all the answers

What is the characteristic of a centrosome in a cell?

<p>It is the region of the cell where the centrioles are found (C)</p> Signup and view all the answers

What is the primary function of a mitochondrion in a cell?

<p>To generate energy for the cell (D)</p> Signup and view all the answers

What is the primary function of a plasmid in a bacterium?

<p>To provide an evolutionary advantage (D)</p> Signup and view all the answers

What is the characteristic of a retrovirus?

<p>It carries an enzyme that synthesizes DNA from RNA (A)</p> Signup and view all the answers

What is the function of a sex pilus?

<p>To form conjugation bridges between bacteria (B)</p> Signup and view all the answers

What is the function of a tail sheath?

<p>To inject genetic information into a bacterium (D)</p> Signup and view all the answers

What is a virulence factor?

<p>A type of plasmid that makes a bacterium more pathogenic (C)</p> Signup and view all the answers

What is a provirus or prophage?

<p>A latent piece of viral genome that has been integrated into the host's genome (C)</p> Signup and view all the answers

What is a mitochondrion?

<p>A double-membraned organelle that generates ATP (C)</p> Signup and view all the answers

What is a lumen?

<p>The inside space of a hollow tubular structure (D)</p> Signup and view all the answers

What is the primary function of the Smooth ER in terms of protein synthesis?

<p>Packaging and transportation of proteins to the Golgi Apparatus (C)</p> Signup and view all the answers

What is the role of the Cytoskeleton in the cell?

<p>To provide shape and structure to the cell (C)</p> Signup and view all the answers

What is the characteristic that distinguishes Smooth ER from Rough ER?

<p>Absence of ribosomes (B)</p> Signup and view all the answers

What is the purpose of the Golgi Apparatus receiving materials from the ER?

<p>To modify materials by adding functional groups (B)</p> Signup and view all the answers

What is the relationship between the Endoplasmic Reticulum and the nuclear envelope?

<p>They are contiguous (D)</p> Signup and view all the answers

What is the function of the Smooth ER in terms of lipid synthesis?

<p>Synthesis of lipids (C)</p> Signup and view all the answers

What is the path that materials take after leaving the Smooth ER?

<p>To the Golgi Apparatus (B)</p> Signup and view all the answers

What is the role of the Smooth ER in detoxification?

<p>To detoxify certain drugs and poisons (A)</p> Signup and view all the answers

What is the primary function of an endosome?

<p>To digest and recycle cellular waste (A)</p> Signup and view all the answers

Which type of anaerobe is not harmed by the presence of oxygen in the environment?

<p>Aerotolerant anaerobe (D)</p> Signup and view all the answers

What is the term for small membrane-bound sacs that include lysosomes and endosomes?

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

What is the process by which a bacterium shares genetic information with another bacterium?

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

What is the term for a bacterium that requires oxygen to survive?

<p>Obligate aerobe (C)</p> Signup and view all the answers

What is the term for a specific subunit within a cell that has a specialized function?

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

What is the term for a plasmid that can integrate itself into the host bacterium's genome?

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

What is the term for a bacterium that dies in the presence of oxygen and requires a non-oxygen environment to survive?

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

What is the primary function of a plasmid in a bacterium?

<p>To provide an evolutionary advantage (C)</p> Signup and view all the answers

What is the function of a retrovirus' reverse transcriptase?

<p>To synthesize DNA from RNA (B)</p> Signup and view all the answers

What is the primary function of the basal body in flagellum activation?

<p>To generate the motor force for flagellum movement (B)</p> Signup and view all the answers

What is the function of a sex pilus?

<p>To form conjugation bridges with other bacteria (A)</p> Signup and view all the answers

What is the function of a virulence factor?

<p>To make the bacterium more pathogenic (C)</p> Signup and view all the answers

What is the main function of the basement membrane?

<p>To provide structural support to the epithelial cells (A)</p> Signup and view all the answers

What is the term for all the layers of the cell extending outward from the membrane?

<p>Cell envelope (D)</p> Signup and view all the answers

What is the function of a tail sheath?

<p>To inject genetic information into a bacterium (A)</p> Signup and view all the answers

What is a characteristic of retroviruses?

<p>They are enveloped single-stranded RNA viruses (A)</p> Signup and view all the answers

What is the main difference between prokaryotic and eukaryotic cell walls?

<p>Prokaryotic cell walls are more rigid and composed of peptidoglycan (B)</p> Signup and view all the answers

What is the term for the collection of extracellular molecules secreted by cells?

<p>Extracellular matrix (D)</p> Signup and view all the answers

What is a characteristic of plasmids?

<p>They are small pieces of circular DNA (C)</p> Signup and view all the answers

What is a characteristic of proviruses or prophages?

<p>They are latent pieces of viral genome (A)</p> Signup and view all the answers

What is the characteristic of the death phase in bacterial growth?

<p>The bacteria are quickly dying due to starvation (D)</p> Signup and view all the answers

What is the term for the outer barrier of the cell?

<p>Cell wall (C)</p> Signup and view all the answers

What is the term for the underlying layer of connective tissue attached to epithelial cells?

<p>Basement membrane (D)</p> Signup and view all the answers

What is the primary function of the nucleus in eukaryotic cells?

<p>Storing genetic information and machinery (B)</p> Signup and view all the answers

What is the characteristic structure of flagella and cilia in eukaryotic cells?

<p>9 + 2 structure, which is 9 doublets of microtubules surrounding a central doublet (C)</p> Signup and view all the answers

What is the restriction on bacterial conjugation?

<p>F+ bacteria can only conjugate with F- bacteria (C)</p> Signup and view all the answers

What is the stationary phase in bacterial growth?

<p>The phase where bacteria have reduced resources and can no longer grow quickly (C)</p> Signup and view all the answers

What is the stroma composed of?

<p>Connective tissue (C)</p> Signup and view all the answers

What is viral lysis?

<p>When a virus kills the host cell, causing it to spill out its contents (C)</p> Signup and view all the answers

What kind of genetic information can viruses carry?

<p>Any kind of genetic information (A)</p> Signup and view all the answers

What is viral extrusion?

<p>When a virus leaves a cell by exocytosis (C)</p> Signup and view all the answers

What is the primary function of connective tissue in the body?

<p>To provide a framework for epithelial cells to function (B)</p> Signup and view all the answers

What is the role of the mitochondrial outer membrane?

<p>To serve as a selective barrier between the cytosol and the inner environment of the mitochondrion (A)</p> Signup and view all the answers

What is the function of the nucleolus in the nucleus?

<p>To synthesize ribosomal RNA (rRNA) (C)</p> Signup and view all the answers

What is the correct order of taxonomy from most general to most specific?

<p>Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species (C)</p> Signup and view all the answers

What is the primary function of the nucleus in eukaryotic cells?

<p>To control the cell's growth and reproduction (C)</p> Signup and view all the answers

What is the function of the hook in bacterial flagella?

<p>To connect the filament and the basal body (A)</p> Signup and view all the answers

What is the function of lysosomes in the cell?

<p>To digest foreign material and damaged organelles (C)</p> Signup and view all the answers

What is the mitochondrial matrix?

<p>The space inside the mitochondrion's inner membrane (A)</p> Signup and view all the answers

What is the destination of the modified material after leaving the Golgi Apparatus?

<p>Outside the cell or back to the Endoplasmic Reticulum (A)</p> Signup and view all the answers

What is the stage of bacterial growth where the bacteria are adapting to the environmental conditions?

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

What is the process by which bacteriophages can spread?

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

What is the structure composed of flagellin?

<p>Bacterial flagellum filament (B)</p> Signup and view all the answers

What is the shape of Spirilli bacteria?

<p>Long thin spirals (D)</p> Signup and view all the answers

What happens to the host cell in the Lytic cycle?

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

What does it mean for a mitochondrion to be semiautonomous?

<p>It can perform a couple of functions on its own independently from the cell (B)</p> Signup and view all the answers

What is the characteristic of Columnar Epithelium?

<p>Composed of long, thin, column shaped cells (D)</p> Signup and view all the answers

What is the purpose of the lysogenic cycle?

<p>To incorporate the bacteriophage into the host genome (C)</p> Signup and view all the answers

What is the stage of bacterial growth characterized by exponential growth?

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

What is the definition of a eukaryotic cell?

<p>A cell that has a nucleus and membrane bound organelles (B)</p> Signup and view all the answers

What is the Golgi Apparatus?

<p>A series of stacked membrane-bound sacs (B)</p> Signup and view all the answers

What is the characteristic of a female bacterium?

<p>It does not have a sex factor plasmid (A)</p> Signup and view all the answers

What is the shape of Cuboidal Epithelium?

<p>Cube shaped (D)</p> Signup and view all the answers

What is the characteristic of Squamous Epithelium?

<p>Composed of flat, scale like cells (B)</p> Signup and view all the answers

What is the shape of Cocci bacteria?

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

What is the primary function of the basal body?

<p>To anchor the flagellum to the membrane and provide motor force (C)</p> Signup and view all the answers

What is the main function of the basement membrane?

<p>To anchor epithelial cells together (A)</p> Signup and view all the answers

What is the term for the layers of the cell extending outward from the membrane?

<p>Cell envelope (D)</p> Signup and view all the answers

What is the characteristic of the cell wall in certain eukaryotes?

<p>It is present in plants, algae, and fungi (A)</p> Signup and view all the answers

What is the primary function of the extracellular matrix?

<p>To allow cells to associate and communicate with each other (B)</p> Signup and view all the answers

What is the term for the stage of bacterial growth where the growth rate slows down due to depletion of resources?

<p>Stationary phase (C)</p> Signup and view all the answers

What is the primary function of the cell envelope in bacteria with a cell wall and a capsule?

<p>To include the membrane, cell wall, and capsule (D)</p> Signup and view all the answers

What is the characteristic of the death phase in bacterial growth?

<p>Rapid death due to depletion of resources (D)</p> Signup and view all the answers

What is the function of the Centriole in a cell?

<p>Organizing center for the Microtubules (B)</p> Signup and view all the answers

What are the three domains of life?

<p>Eukarya, Archaea, and Bacteria (C)</p> Signup and view all the answers

What is the function of Epithelial Tissue?

<p>To provide protection against infection and dessication (A)</p> Signup and view all the answers

What is the purpose of Safranin in the Gram Stain process?

<p>To counterstain the bacterial cell (B)</p> Signup and view all the answers

What are the three components of a bacterial flagellum?

<p>The Filament, The Basal Body, and The Hook (B)</p> Signup and view all the answers

What is the function of the Centriole in cell division?

<p>To separate chromosomes during mitosis (C)</p> Signup and view all the answers

What is the characteristic of Gram Negative cells in the Gram Stain process?

<p>The thin layer of peptidoglycan is washed away (A)</p> Signup and view all the answers

What are the three forms of genetic recombination seen in Bacteria?

<p>Transformation, Transduction, and Conjugation (D)</p> Signup and view all the answers

What is the primary function of connective tissue in the body?

<p>To support the body and provide a framework for epithelial cells (B)</p> Signup and view all the answers

What is the function of the mitochondrial outer membrane?

<p>To control the movement of molecules in and out of the mitochondrion (B)</p> Signup and view all the answers

What is the function of the nucleolus in the nucleus?

<p>To synthesize ribosomal RNA (B)</p> Signup and view all the answers

What is the correct order of taxonomy from most general to most specific?

<p>Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species (A)</p> Signup and view all the answers

What is the function of the hook in bacterial flagella?

<p>To connect the filament and the basal body to facilitate motion (B)</p> Signup and view all the answers

What is the function of lysosomes?

<p>To digest foreign material and damaged organelles (C)</p> Signup and view all the answers

What is the function of the mitochondrial matrix?

<p>The space inside the mitochondrion's inner membrane (A)</p> Signup and view all the answers

What is the function of the nucleus?

<p>The control center of the cell (D)</p> Signup and view all the answers

What is the primary function of a plasmid?

<p>To provide antibiotic resistance (A)</p> Signup and view all the answers

What is the role of reverse transcriptase in retroviruses?

<p>To synthesize DNA from RNA (B)</p> Signup and view all the answers

What is the characteristic of a sex (F) factor?

<p>It is a type of plasmid that allows bacterium to form sex pili (A)</p> Signup and view all the answers

What is the function of a tail sheath in a bacteriophage?

<p>To inject genetic information into the bacterium (C)</p> Signup and view all the answers

What is the characteristic of a provirus or prophage?

<p>It is a latent piece of viral genome that has been integrated into the host's genome (B)</p> Signup and view all the answers

What is the primary function of a mitochondrion?

<p>To generate ATP (C)</p> Signup and view all the answers

What is the primary function of a centriole?

<p>To provide a site for chromosome segregation (C)</p> Signup and view all the answers

What is the characteristic of a virulence factor?

<p>It is a type of plasmid that specifically makes the bacterium more pathogenic (C)</p> Signup and view all the answers

What is the main function of a facultative anaerobe?

<p>To switch between anaerobic and aerobic metabolism (D)</p> Signup and view all the answers

What is the primary function of a peroxisome?

<p>To contain hydrogen peroxide (C)</p> Signup and view all the answers

What is the characteristic of a lumen?

<p>It is the inside space of any hollow tubular structure (D)</p> Signup and view all the answers

What is the primary function of a histone?

<p>To organize DNA in the nucleus (C)</p> Signup and view all the answers

What is the primary function of a flagellum?

<p>To achieve cell movement (B)</p> Signup and view all the answers

What is the primary function of cilia?

<p>To move materials along the cell surface (D)</p> Signup and view all the answers

What is the structure composed of nine triplets of microtubules?

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

What is the region of the cell where centrioles are found?

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

What is a characteristic of an obligate anaerobe?

<p>It dies in the presence of oxygen. (B)</p> Signup and view all the answers

What is the function of an endosome?

<p>To digest and process cellular waste and foreign substances. (C)</p> Signup and view all the answers

What is an episome?

<p>A plasmid that can integrate itself into the host bacterium's genome. (B)</p> Signup and view all the answers

What is the primary function of an organelle?

<p>To perform specialized functions for the cell. (C)</p> Signup and view all the answers

What is an aerotolerant anaerobe?

<p>A bacterium that cannot use oxygen in metabolism, but is not harmed by its presence. (C)</p> Signup and view all the answers

What is the primary function of a vesicle?

<p>To store and transport molecules within the cell. (C)</p> Signup and view all the answers

What is the term for the process of bacterial genetic information sharing?

<p>Bacterial conjugation. (C)</p> Signup and view all the answers

What is the characteristic of an anaerobe?

<p>It cannot use oxygen in metabolism. (B)</p> Signup and view all the answers

What is the primary function of the basal body in relation to the flagellum?

<p>To generate the motor force necessary to activate the flagellum (D)</p> Signup and view all the answers

What is the main function of the basement membrane?

<p>To keep epithelial cells close together and cohesive (B)</p> Signup and view all the answers

What is the cell envelope composed of in bacteria with a cell wall and a capsule?

<p>The membrane, cell wall, and capsule (B)</p> Signup and view all the answers

Which of the following organisms typically has a cell wall?

<p>Most prokaryotes and some eukaryotes (plants, algae, fungi) (B)</p> Signup and view all the answers

What is the primary function of the extracellular matrix?

<p>To provide structural and biochemical support to individual cells within a tissue (C)</p> Signup and view all the answers

What is the characteristic of the death phase in bacterial growth?

<p>Rapid cell death due to starvation (C)</p> Signup and view all the answers

What is the main function of the cell wall in a cell?

<p>To provide structural support and maintain the cell's shape (B)</p> Signup and view all the answers

What is the relationship between the cell envelope and the cell wall in bacteria without a capsule?

<p>The cell envelope is composed of the cell membrane and the cell wall (D)</p> Signup and view all the answers

What is the primary function of the stroma in an organ?

<p>To support the parenchyma and maintain organ structure (C)</p> Signup and view all the answers

What is the characteristic of the 9 + 2 structure in eukaryotic cells?

<p>It is a characteristic of flagella and cilia (C)</p> Signup and view all the answers

In which phase of bacterial growth do the bacteria have reduced resources and can no longer grow as quickly?

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

What is the outcome of viral lysis in a host cell?

<p>The host cell spills out its contents, including the virus (C)</p> Signup and view all the answers

What type of tissue is the stroma composed of?

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

What is the advantage of viral extrusion over viral lysis?

<p>Viral extrusion allows the host cell to survive (C)</p> Signup and view all the answers

What is the characteristic of the double membrane envelope surrounding the nucleus?

<p>It is a characteristic of eukaryotic cells (B)</p> Signup and view all the answers

What is the outcome of bacterial conjugation between F+ and F- bacteria?

<p>The F+ bacteria transfers its genetic material to the F- bacteria (A)</p> Signup and view all the answers

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