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Questions and Answers
What is the primary function of ribosomes in prokaryotic cells?
What is the primary function of ribosomes in prokaryotic cells?
- Regulation of gene expression
- Storage of nutrients
- Site of protein synthesis (correct)
- ATP production
Which statement accurately describes the structure of prokaryotic ribosomes?
Which statement accurately describes the structure of prokaryotic ribosomes?
- They have a size of 40 nm by 60 nm.
- They are made of two subunits: 50S and 30S. (correct)
- They consist of one single subunit.
- They are bound by a double membrane.
What are polyribosomes in prokaryotic cells?
What are polyribosomes in prokaryotic cells?
- Ribosomes that are attached to the plasma membrane.
- Structures that store reserve materials.
- Chains of ribosomes attached to a single mRNA. (correct)
- Single ribosomes translating one mRNA.
How do inclusion bodies in prokaryotic cells differ from membrane-bound organelles?
How do inclusion bodies in prokaryotic cells differ from membrane-bound organelles?
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Which of the following is NOT an example of an inclusion body in prokaryotic cells?
Which of the following is NOT an example of an inclusion body in prokaryotic cells?
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Study Notes
Ribosomes in Prokaryotes
- Ribosomes are associated with the plasma membrane in prokaryotic cells.
- Size of ribosomes: approximately 15 nm by 20 nm.
- Comprised of two subunits: 50S and 30S, which combine to form 70S ribosomes.
- Function as the site for protein synthesis.
- Multiple ribosomes can attach to a single mRNA, forming polyribosomes (or polysomes).
- Polysomes enable the simultaneous translation of mRNA into proteins.
Inclusion Bodies
- Prokaryotic cells store reserve materials as inclusion bodies within the cytoplasm.
- Inclusion bodies lack a membrane system and exist freely in the cytoplasm.
- Common types of inclusion bodies include phosphate granules, cyanophycean granules, and glycogen granules.
- Gas vacuoles are present in some bacteria, particularly in blue-green, purple, and green photosynthetic species.
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Description
Learn about the structure and function of ribosomes in prokaryotes, including their association with the plasma membrane and role in protein synthesis. Also, explore inclusion bodies and their role in cell biology.
