Mitochondria and Peroxisomes: Ultrastructure and Metabolic States
60 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the characteristic appearance of an adipocyte due to the presence of a nucleus in the rim of cytoplasm?

  • Ring-shaped
  • Signet ring (correct)
  • Circular
  • Oval-shaped

    • What is the purpose of the Azan staining method in microscopy?

  • To distinguish between different types of cell death
  • To highlight the presence of lipofuscin in neurons
  • To pick out the nuclei and nucleoli in cells (correct)
  • To visualize the structure of lipid droplets

    • What type of cells are often found within the delicate connective tissue stroma along with adipocytes?

  • Neurofilaments
  • Mast cells (correct)
  • Fibroblasts
  • Neurotubules

    • What is the primary component of lipofuscin in neurons?

    <p>Melanin</p> Signup and view all the answers

    What is the primary function of glycogen granules in the liver cell cytoplasm?

    <p>To serve as a ready source of energy</p> Signup and view all the answers

    What is the difference in the appearance of microtrabecular lattices between PEG-TEM and epoxy sections?

    <p>Epoxy shows fuzzy strands, while PEG-TEM shows distinct strands</p> Signup and view all the answers

    What is the characteristic morphology of adipocytes in white adipose tissue?

    <p>Spherical profile with a single large fat-containing vacuole</p> Signup and view all the answers

    What is the term for the network of strands that occupy the cytoplasmic matrix between membranous organelles?

    <p>Microtrabecular lattices</p> Signup and view all the answers

    What is the term for the type of blood vessels that are mostly present in the stroma between adipocytes?

    <p>Capillaries</p> Signup and view all the answers

    What is the characteristic feature of a necrotic cell observed under TEM?

    <p>Disruption of plasma membrane and organelles</p> Signup and view all the answers

    What is the function of peripheral proteins in lipid droplets?

    <p>To regulate lipid metabolism</p> Signup and view all the answers

    What is the main function of microtubules in a dividing cell?

    <p>Separating chromosomes during mitosis</p> Signup and view all the answers

    What is the characteristic arrangement of glycogen granules in the liver cell cytoplasm?

    <p>Forming characteristic aggregates</p> Signup and view all the answers

    What type of cells are likely to have a nucleus that is not included in the plane of section of a given cell due to their relatively large size?

    <p>Adipocytes</p> Signup and view all the answers

    What is the purpose of the H&E staining method in microscopy?

    <p>To provide a general overview of cellular morphology</p> Signup and view all the answers

    What is the characteristic feature of lipofuscin in neurons?

    <p>It is a type of brown pigment</p> Signup and view all the answers

    What is the primary function of the mitochondria in a cell when they exhibit a condensed morphology?

    <p>Production of ATP</p> Signup and view all the answers

    Which microscopy technique is used to visualize the intermediate filaments in the apical part of an epithelial cell?

    <p>Quick-freeze deep-etch technique</p> Signup and view all the answers

    What is the bar scale of the micrograph in Figure 2?

    <p>0.1 um</p> Signup and view all the answers

    What is the main difference between the apoptosis and necrosis processes?

    <p>Apoptosis involves surface blebbing, while necrosis involves numerous lesions on the cell surface</p> Signup and view all the answers

    What is the name of the organelle that exhibits a matrix of moderate electron density under TEM?

    <p>Peroxisomes</p> Signup and view all the answers

    What is the function of the nuclear envelope in normal cells?

    <p>To regulate the exchange of materials between the nucleus and the cytoplasm</p> Signup and view all the answers

    What is the term for the state of mitochondria when they are producing ATP?

    <p>State III</p> Signup and view all the answers

    What is the purpose of the actin-binding proteins in the terminal web of an epithelial cell?

    <p>Cross-linking actin filaments</p> Signup and view all the answers

    What is the magnification of the Transmission Electron Microscopy (TEM) image shown in Figure 2?

    <p>x 10,000</p> Signup and view all the answers

    What is the characteristic feature of the nuclear envelope observed in apoptotic cells using FF (freeze-fracture) technique?

    <p>Clustering of nuclear pores</p> Signup and view all the answers

    What is the term for the network of actin filaments that anchors the microvilli in an epithelial cell?

    <p>Terminal web</p> Signup and view all the answers

    What is the characteristic feature of the apoptotic cell shown in Figure 4?

    <p>Surface blebbing</p> Signup and view all the answers

    What is the function of the microfilament arrays in microvilli?

    <p>Forming the core of microvilli</p> Signup and view all the answers

    What is the main difference between the SEM image of an apoptotic cell (Figure 4) and a necrotic cell (Figure 3)?

    <p>Apoptotic cells have surface blebbing, while necrotic cells have numerous lesions on the cell surface</p> Signup and view all the answers

    What is the characteristic feature of the organelles in the apoptotic cell shown in Figure 2?

    <p>They are well-preserved and normal</p> Signup and view all the answers

    What is the magnification of the FF image shown in Figure 5?

    <p>x 30,000</p> Signup and view all the answers

    What is the primary function of the axonal microtubules in an axon?

    <p>To transport molecules along the axon</p> Signup and view all the answers

    What is the name of the filaments found in nerve cells that provide internal support?

    <p>Neurofilaments</p> Signup and view all the answers

    What is the magnification of the micrograph showing the basal body of a cilium?

    <p>X15,000</p> Signup and view all the answers

    What is the name of the organelle that anchors the axoneme to the apical cytoplasm?

    <p>Basal body</p> Signup and view all the answers

    What is the purpose of the glycocalyx in the microvilli?

    <p>To contain enzymes for late stages of macromolecule digestion</p> Signup and view all the answers

    What type of cell is shown in the micrograph with numerous very long stereocilia?

    <p>Epithelial cell</p> Signup and view all the answers

    What is the name of the technique used to observe the internal structure of cells?

    <p>Transmission electron microscopy</p> Signup and view all the answers

    What is the function of satellite cells in dorsal root ganglia?

    <p>To support sensory nerve cells</p> Signup and view all the answers

    Where are rRNA processed and associated with ribosomal proteins?

    <p>Nucleolus</p> Signup and view all the answers

    What is the function of the fibrillar centers in the nucleolus?

    <p>Transcription of rRNA genes</p> Signup and view all the answers

    What is the structure that runs along the long axis of each chromosome?

    <p>Protein scaffold</p> Signup and view all the answers

    What is the characteristic of the granular material in the nucleolus?

    <p>Represents the site of initial rRNA synthesis</p> Signup and view all the answers

    What is the purpose of the nucleolus in the cell?

    <p>To transcribe and process rRNA</p> Signup and view all the answers

    What is the primary function of the nucleolus in cells?

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

    What is the characteristic feature of heterochromatin in the nucleus?

    <p>It is more highly condensed and transcriptionally inactive</p> Signup and view all the answers

    How is DNA organized during transcription?

    <p>It forms 300 nm loops that are stabilized by protein scaffolds</p> Signup and view all the answers

    What is the name of the network formed by the granular and fibrillar material in the nucleolus?

    <p>Nucleolonema</p> Signup and view all the answers

    What is the characteristic feature of the nuclear lamina?

    <p>It is associated with the periphery of the nucleus</p> Signup and view all the answers

    What is the estimated length of the DNA molecule in a human cell?

    <p>100,000 times longer than the nuclear diameter</p> Signup and view all the answers

    What is the function of the nucleolus in the cell?

    <p>Synthesizing ribosomal RNA</p> Signup and view all the answers

    What is the characteristic of heterochromatin?

    <p>Found at the periphery of the nucleus</p> Signup and view all the answers

    What is the result of further folding of chromatin?

    <p>Chromosomes</p> Signup and view all the answers

    What is the primary function of the nucleolus?

    <p>To assemble ribosomal subunits from rRNA and ribosomal proteins</p> Signup and view all the answers

    What is the characteristic of euchromatin in the interstices of the nuclear envelope?

    <p>It is loosely coiled and transcriptionally active</p> Signup and view all the answers

    What is the role of heterochromatin in the vicinity of the nucleolus?

    <p>It is a region of compacted chromatin that is transcriptionally inactive</p> Signup and view all the answers

    Where is the transcription of ribosomal RNA (rRNA) carried out?

    <p>In the nucleolus</p> Signup and view all the answers

    What is the fate of the partially assembled ribosomal subunits in the nucleolus?

    <p>They are exported to the cytoplasm for further processing</p> Signup and view all the answers

    What is the name of the complex formed by DNA and structural proteins?

    <p>Chromatin</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser