Biology: The Importance of Nucleus in Cell Structure
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Questions and Answers

What is the function of the nucleus in a cell?

  • Regulates the cell's movement
  • Stores energy for the cell
  • Protects the cell's cytoplasm
  • Encloses and protects the cell's genetic material (correct)

    • Which type of cells have a nucleus to protect their DNA?

  • Bacterial cells
  • Prokaryotic cells
  • Stem cells
  • Eukaryotic cells (correct)

    • Where is the nucleus located in a cell?

  • In the cytoplasm
  • In the center of the cell (correct)
  • Attached to the mitochondria
  • At the cell membrane

    • What organelle is often referred to as the 'brain' of the cell?

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

    Which nitrogenous base pairs with adenine in RNA?

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

    What is the process called when RNA 'copies' the DNA using base pairing?

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

    What is the function of transfer RNA (tRNA) during translation?

    <p>Bond with mRNA using base pairs</p> Signup and view all the answers

    What defines a key difference between DNA and RNA in terms of structure?

    <p>Being double-stranded vs single-stranded</p> Signup and view all the answers

    Which molecules are made in the nucleus and control protein production?

    <p>mRNA and rRNA</p> Signup and view all the answers

    What is the final product of gene expression that carries out specific functions?

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

    What is the function of the nucleolus?

    <p>Handles the production of ribosomes</p> Signup and view all the answers

    What is the role of the smooth endoplasmic reticulum in a cell?

    <p>Synthesizes lipids and hormones</p> Signup and view all the answers

    Why is protecting the DNA a vital job of the nucleus?

    <p>To safeguard an organism's traits</p> Signup and view all the answers

    What is the main function of genes in a cell?

    <p>Code for specific traits or functions</p> Signup and view all the answers

    During which cell process does DNA replication occur?

    <p>Cell division</p> Signup and view all the answers

    What happens to chromatin during cell division?

    <p>Forms into chromosomes</p> Signup and view all the answers

    Where is ribosomal RNA (rRNA) formed within a cell?

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

    What is the primary function of the nuclear pores in the nuclear envelope?

    <p>To allow substances in and out of the nucleus</p> Signup and view all the answers

    Which organelle is responsible for synthesizing lipids and hormones?

    <p>Smooth endoplasmic reticulum</p> Signup and view all the answers

    What is the role of chromatin within the nucleus?

    <p>Organizes into chromosomes during cell division</p> Signup and view all the answers

    Why is it essential for a cell to differentiate?

    <p>To handle one specific job effectively</p> Signup and view all the answers

    What occurs during the first phase of cell division?

    <p>Chromosomes are pulled to opposite sides of the cell</p> Signup and view all the answers

    What is the role of the nucleus in a cell?

    <p>Controlling DNA replication and expression</p> Signup and view all the answers

    Which type of cells lack a nucleus to hold their genetic material?

    <p>Prokaryotic cells</p> Signup and view all the answers

    What is the function of the nucleolus in a cell?

    <p>Producing ribosomes</p> Signup and view all the answers

    Where are ribosomes typically found in relation to the nucleus within a cell?

    <p>On the surface of the nucleus</p> Signup and view all the answers

    What are the nitrogenous bases that pair up consistently in DNA?

    <p>Guanine with adenine</p> Signup and view all the answers

    Which molecule replaces thymine in RNA base pairing?

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

    What is the role of transfer RNA (tRNA) during translation?

    <p>Transporting amino acids</p> Signup and view all the answers

    What does DNA consist of?

    <p>Double strands twisting around each other</p> Signup and view all the answers

    Which nucleic acid is responsible for carrying messages from DNA to ribosomes?

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

    What occurs during the process of transcription?

    <p>Unraveling of DNA for RNA synthesis</p> Signup and view all the answers

    What is the role of the nucleolus in the nucleus?

    <p>Producing ribosomes</p> Signup and view all the answers

    During which cell process does chromatin usually appear as a mess of threads?

    <p>Cell division</p> Signup and view all the answers

    Which organelle is responsible for synthesizing proteins in the cytoplasm?

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

    What is the main function of the nuclear pores in the nuclear envelope?

    <p>Allowing substances to move in and out of the nucleus</p> Signup and view all the answers

    How does the nucleus contribute to cell differentiation?

    <p>By controlling gene expression</p> Signup and view all the answers

    What is the primary function of genes in a cell?

    <p>Controlling gene expression</p> Signup and view all the answers

    Where is ribosomal RNA (rRNA) formed within a cell?

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

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