Cell Biology: Ribosomes and Cytoskeleton
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Questions and Answers

What is the main function of ribosomes?

  • Cell division
  • DNA replication
  • Protein synthesis (correct)
  • Lipid synthesis

Where is rRNA synthesized in the cell?

  • Nucleolus (correct)
  • Golgi apparatus
  • Cytoplasm
  • Ribosomes

Which component of the cytoskeleton forms a 3D network in cells?

  • Microtubules
  • Thin filaments
  • Actin filaments
  • Intermediate filaments (correct)

What is the primary function of microtubules?

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

What is the main function of cilia?

<p>Movement of materials (C)</p> Signup and view all the answers

Which organelle has a brush border appearance in light microscopy?

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

Which area of the nucleolus contains inactive DNA?

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

The nuclear envelope is continuous with which organelle?

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

What is the main function of intermediate filaments?

<p>Provide cellular support and structure (D)</p> Signup and view all the answers

Where is melanin typically found?

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

Which type of microtubule population is stable?

<p>Part of centrioles (B)</p> Signup and view all the answers

What does the nuclear matrix contain?

<p>Metabolites, minerals, and fibrils (D)</p> Signup and view all the answers

Which organelle appears blue with basic stains?

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

What is the role of actin filaments?

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

Which of the following is not a component of the cytoskeleton?

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

What does 'E/M' refer to in microscopy?

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

Flashcards

Ribosome function

Protein synthesis within the cell

rRNA synthesis location

Nucleolus

Free ribosomes function

Cell growth and protein synthesis in cytoplasm

Cytoskeleton 3D network

Intermediate filaments

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Microtubules key function

Cell movement and internal structure

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Centriole structure

9+3 arrangement of microtubules

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Cilia function

Movement of materials within the cell or outside of the cell

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Microfilaments types

Actin and myosin filaments

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Ribosome function

Ribosomes are the cellular structures responsible for protein synthesis.

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Cilia function

Cilia are hair-like structures that move fluids or mucus across the surface of cells.

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Centriole function

Centrioles are involved in cell division and organization of microtubules.

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Melanin location

Melanin is primarily found in the skin.

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Nuclear matrix components

The nuclear matrix contains metabolites, minerals, and fibrils.

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Actin filament role

Actin filaments are crucial for muscle contraction.

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Cytoskeleton component

Chromatin is NOT a component of the cytoskeleton.

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Stable microtubules

Microtubules that are part of centrioles are considered stable.

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Study Notes

Ribosomes

  • Primary function: Protein synthesis
  • rRNA synthesis site: Nucleolus

Cell Growth Ribosomes

  • Free ribosomes are involved in cell growth

Cytoskeleton Components

  • Intermediate filaments form a 3D network in cells

Microtubule Function

  • Primary function: Movement of materials

Cilia Function

  • Primary function: Movement of materials

Microfilament Types

  • Actin and myosin

Organelle with Brush Border

  • Microvilli

Microvilli Role

  • Increase surface area for absorption

Centrioles Structure

  • Organized in a 9+2 pattern

Melanin Location

  • Typically found in skin

Nuclear Matrix Content

  • Contains metabolites, minerals, and fibrils

Transcriptionally Active Chromatin

  • Euchromatin

Histone Location

  • Chromatin

Ribosomal Subunit Synthesis Location

  • Nucleolus

Nuclear Envelope Connection

  • Continuous with the endoplasmic reticulum (ER)

Ribosome Subunits

  • Ribosomes are made up of 2 subunits

9+2 Structure

  • Centrioles are organized in a 9 + 2 pattern

Intermediate Filaments Function

  • Support and structure of the cell

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Description

This quiz covers essential concepts in cell biology, focusing on ribosomes, their functions in protein synthesis, and the structure of the cytoskeleton. Explore topics like microtubules, microvilli, and the organization of ribosomal subunits. Test your knowledge on the fundamental components that contribute to cell growth and functionality.

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