Podcast
Questions and Answers
What is the primary function of ribosomes in the cell?
What is the primary function of ribosomes in the cell?
- Energy production
- Protein synthesis (correct)
- DNA replication
- Lipid synthesis
Which organelle is responsible for modifying and packaging secretory products?
Which organelle is responsible for modifying and packaging secretory products?
- Golgi apparatus (correct)
- Mitochondria
- Ribosomes
- Endoplasmic reticulum
Which of the following best describes the role of the cell cytoskeleton?
Which of the following best describes the role of the cell cytoskeleton?
- Energy production
- Storage of nutrients
- Maintaining cell shape and structure (correct)
- Synthesis of ribosomal RNA
What is NOT a component of a eukaryotic cell?
What is NOT a component of a eukaryotic cell?
Which organelle is involved in polysaccharide synthesis?
Which organelle is involved in polysaccharide synthesis?
Which statement about ribosomes is false?
Which statement about ribosomes is false?
What key function does the Golgi apparatus NOT perform?
What key function does the Golgi apparatus NOT perform?
Why is the cytoskeleton important for cells?
Why is the cytoskeleton important for cells?
What is a primary function of the Rough Endoplasmic Reticulum (RER)?
What is a primary function of the Rough Endoplasmic Reticulum (RER)?
Which process is associated with Smooth Endoplasmic Reticulum (SER)?
Which process is associated with Smooth Endoplasmic Reticulum (SER)?
What is the pH level characteristic of lysosomes?
What is the pH level characteristic of lysosomes?
Which of the following statements about mitochondria is NOT true?
Which of the following statements about mitochondria is NOT true?
What role do peroxisomes play in cellular metabolism?
What role do peroxisomes play in cellular metabolism?
What type of proteins are secreted by the Rough Endoplasmic Reticulum?
What type of proteins are secreted by the Rough Endoplasmic Reticulum?
Which of the following is a characteristic of mitochondrial DNA (mtDNA)?
Which of the following is a characteristic of mitochondrial DNA (mtDNA)?
Which of the following cellular structures is primarily involved in the degradation of material?
Which of the following cellular structures is primarily involved in the degradation of material?
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Study Notes
The Cell
- Cells have many forms and shapes.
- The eukaryotic cell has a cell membrane, nucleus, ribosomes, endoplasmic reticulum, Golgi apparatus, centriole, and mitochondria.
Ribosomes
- Ribosomes are composed of a large (60S) and small (40S) subunit.
- Ribosomes contain rRNA to stabilize structure.
- Ribosomes are produced and assembled in the nucleolus.
- Ribosomes are responsible for protein synthesis.
Golgi Apparatus
- The Golgi apparatus is responsible for polysaccharide synthesis, modifying secretory products, sorting secretory products, packaging secretory products, concentrating secretory products, and storing secretory products.
Endoplasmic Reticulum
- The endoplasmic reticulum (ER) is responsible for synthesizing, packing, and processing molecules.
- The ER has two forms: rough ER (RER) and smooth ER (SER).
- Rough ER (RER)
- Sequesters proteins from the cytoplasm.
- Processes secretory, integral membrane, and lysosomal proteins.
- Participates in core glycosylation.
- Smooth ER (SER)
- Participates in lipid metabolism, steroid hormone synthesis, gluconeogenesis, detoxification.
Vesicles
- Granules: Vesicles destined for exocytosis, abundant in specialized secretory cells.
- Lysosomes: Contain hydrolytic enzymes with a pH of 5, degrade material.
- Peroxysomes: Participate in hydrogen peroxide metabolism, assist in fatty acid oxidation.
Mitochondria
- The mitochondria is called the "powerhouse of the cell."
- Mitochondria synthesize their own DNA and some proteins.
- Mitochondria grow and reproduce.
- Mitochondria can move rapidly and change shape.
- Mitochondria have their own DNA (mtDNA).
- mtDNA is maternally inherited.
- Mitochondria have an outer membrane permeable to molecules.
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