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Intro to Cell Biology II: Cytoplasmic Structures


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What is the general function of an organelle?
Allows genetic information to be translated into cell function
What is the proteinaceous supporting network of a cell?
What is the largest organelle in a cell?
Where can mitochondria be found and what is it's function?
Mitochondria accumulate in parts of cytoplasm where utilization of energy is more intense. The function is to provide energy for chemical and mechanical work.
The mitochondria and nuclear envelop have this unnique structural component in common...
Double Membrane (2 bilayers)
Where does the Kreb cycle take place and where can oxidation enzymes be found?
Mitochondrial Matrix
Is the cristae a folding of the outer or inner mitochondrial membrane? Is this membrane highly porous?
Inner Mito. Membrane; no the inner membrane is less porous than the outer membrane
What organelle translates mRNAs into proteins and permits the synthesis of multiple copies of a protein?
Where can ribosomes be found?
Either free in the cytoplasm (called free polysomes) or attached to rER
What forms an enclosed continuous network of intercommunicating channels and sacs?
Endoplasmic Reticulum
What are the functions of the ER?
synthesizing, packaging, and processing of various cell substances
Describe rough endopaslmic reticulum (rER).
Consists of parallel stacks of flattened cisternae studded with ribosomes that synthesize protins not destined for the cytoplasm
Name some examples of proteins that the rER synthesizes.
Secretory Proteins (Collagen), cell membrane protiens, and lysosomal enzymes
What are some other protein-making cells?
Erthroblasts, eosinophils, plasma cells, and pancreatic acinar cells
Where does ALL protein synthesis begin?
on free polyribosomes (not attached to the ER)

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