Cell Biology: Nucleus and Endoplasmic Reticulum
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Questions and Answers

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

  • Controlling all metabolic activities and cell division (correct)
  • Regulating water balance
  • Transporting nutrients
  • Synthesizing proteins
  • Which structure is responsible for protein synthesis in the Rough Endoplasmic Reticulum?

  • Nucleolus
  • Nuclear pores
  • Chromatin fibers
  • Ribosomes (correct)
  • What distinguishes Smooth Endoplasmic Reticulum from Rough Endoplasmic Reticulum?

  • It is connected to the nuclear membrane only
  • It conducts sugars
  • It contains ribosomes on its surface
  • It detoxifies harmful substances (correct)
  • What happens to chromatin fibers during cell division?

    <p>They condense into chromosomes (C)</p> Signup and view all the answers

    What benefit does the loss of the nucleus provide in red blood cells?

    <p>Allows for greater transport of hemoglobin and oxygen (D)</p> Signup and view all the answers

    Study Notes

    Nucleus

    • The nucleus is enclosed by a double membrane with pores
    • Pores allow material passage
    • Nucleolus is a round structure within the nucleus
    • Chromatin fibers are thread-like structures
    • Chromatin condenses to form chromosomes during cell division
    • Chromosomes contain genes, segments controlling cell functions and heredity

    Nucleus Functions

    • Controls all cell metabolic activities
    • Cell division is controlled
    • Transmission of hereditary traits from parents to offspring

    Endoplasmic Reticulum (ER)

    • Network of interconnected tubes and sheets
    • Filled with fluid
    • Connected to the nucleus (inner side) and plasma membrane (outer side)
    • Rough ER has ribosomes on its surface

    Functions of ER

    • Forms framework supporting the cell
    • Transports proteins
    • Detoxifies substances (toxins, chemicals) that enter the body

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    Description

    Explore the structures and functions of the nucleus and endoplasmic reticulum in this quiz. Understand how these organelles contribute to cell metabolism, division, and protein transport. Test your knowledge on chromatin, chromosomes, and the roles of these essential components in heredity and detoxification.

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