Cells quiz

Organelles of eukaryotic cells

Cells

  1. What is the name and role of this organelle?

    1. mitochondrion - site of cell respiration  
    2. chloroplast - site of photosynthesis  
    3. rough endoplasmic reticulum - site of protein synthesis and transport of proteins within cells  
    4. golgi apparatus - site of protein modification  

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    The rough ER is typically seen with repeating channels lined by black spots ( ribosomes).  The ribosomes synthesize the proteins that are frequently secreted or exported out of the cell.

  2. What is this organelle and what is its role?

    1. rough endoplasmic reticulum - site for protein synthesis and transport of proteins within a cell  
    2. mitochondrion - site of cellular respiration  
    3. chloroplast - site for photoysnthesis  
    4. golgi apparatus - site of protein modification  

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    The mitochondrion is recognized by the smooth outer membrane and the highly folded inner membrane forming the cristae.  The Krebs cycle enzymes are located in the clear area of the matrix within the mitochondrion while the electron transport chain proteins are embedded in the inner membrane of the cristae.  The scale bar represents 200nm so students can calculate the size of the mitochondrion.

  3. What is this organelle and what is its role?

    1. mitochondrion - site of cell respiration  
    2. rough endoplasmic reticulum - site of protein synthesis and transport of proteins within the cell  
    3. golgi apparatus - site of protein modification and packaging for export from the cell  
    4. plasma membrane - regulates the passage of materials in and out of the cell  

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    The golgi apparatus is a series of discs that bud off at the ends to form vesicles for transporting proteins.  There are no ribosomes on the edges so the golgi apparatus looks smooth not rough as the rough ER does.

  4. What is this organelle and what is its role?

    1. mitochondrion - site of cell respiration  
    2. golgi apparatus - site of protein modification and packaging for secretion or export  
    3. nucleus - site of DNA synthesis and contains all the genetic information for the cell  
    4. plasma membrane - regulates the passage of materials in and out of the cell  

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    The nucleus is the largest organelle in cells so is easily recognized. Many nuclei have a dark satining nucleolus.  The double membrane is called the nuclear envelope and has many pores through which materials such as mRNA pass.

  5. What is this organelle and what is its role?

    1. mitochondrion - site of cell respiration  
    2. chloroplast - site of photosynthesis  
    3. golgi apparatus - site of protein modification and packaging for export from the cell  
    4. nucleus - site of DNA synthesis and contains all the genetic information of the cell  

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    The chloroplast has an intricate inner structure.  The outer membrane encloses the grana and the stroma.  The grana are the stacks of thylakoid discs which contain the light absorbing pigments (chlorophyll) for the light dependent reactions. The stroma is the site of the light independent reactions when carbon dioxide is fixed to form organic molecules, such as glucose.

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