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Questions and Answers
What are the two types of Endoplasmic Reticulum?
What are the two types of Endoplasmic Reticulum?
- Active ER and Passive ER
- Rough ER and Dense ER
- Rough ER and Smooth ER (correct)
- Tubular ER and Granular ER
What distinguishes Rough Endoplasmic Reticulum from Smooth Endoplasmic Reticulum?
What distinguishes Rough Endoplasmic Reticulum from Smooth Endoplasmic Reticulum?
- Rough ER has no ribosomes, while Smooth ER has ribosomes.
- Rough ER only synthesizes lipids, while Smooth ER synthesizes proteins.
- Rough ER has ribosomes attached to it, while Smooth ER does not. (correct)
- Rough ER is involved in detoxification, while Smooth ER is not.
Which of the following is NOT a function of the Endoplasmic Reticulum?
Which of the following is NOT a function of the Endoplasmic Reticulum?
- Photosynthesis (correct)
- Protein synthesis
- Transport of materials
- Lipid synthesis
What is the primary role of the ribosomes attached to the Rough Endoplasmic Reticulum?
What is the primary role of the ribosomes attached to the Rough Endoplasmic Reticulum?
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Which process describes the usefulness of proteins and lipids produced by the Endoplasmic Reticulum?
Which process describes the usefulness of proteins and lipids produced by the Endoplasmic Reticulum?
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Study Notes
Endoplasmic Reticulum (ER)
- The endoplasmic reticulum (ER) is a network of interconnected membrane-bound tubes and sheets within a cell.
- The ER membrane is similar in structure to the plasma membrane.
- The ER exists in two forms: tubules and vesicles.
- There are two types of ER: rough ER (RER) and smooth ER (SER).
- RER appears rough due to the presence of ribosomes attached to its surface.
- Ribosomes are the sites of protein synthesis.
- SER lacks ribosomes and is responsible for synthesizing lipids.
- Proteins and lipids are essential for building cell membranes, a process known as membrane biogenesis.
- Some proteins and lipids produced by the ER function as enzymes and hormones.
Functions of ER
- Synthetic Activities: The ER plays a crucial role in synthesizing proteins (RER) and lipids (SER).
- Transport of Materials: ER acts as a network of channels, facilitating the movement of materials within the cell.
- Cytoplasmic Framework: The ER contributes to the structural framework of the cytoplasm, providing support for biochemical activities.
- Detoxification: In liver cells of vertebrates, the ER is involved in detoxifying harmful substances like poisons and drugs.
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