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31 Cards in this Set

  • Front
  • Back
Describe the cell membrane.
-lipid bilayer
-contains phospholipids, steroids, proteins, and carbohydrates
Describe the cytosol.
-fluid component of cytoplasm
-may contain inclusions of insoluble materials
List the cell memebrane's functions
-isolation; protection; sensitbity; suppoprt; control of entrance/exit of materials
List the cytosol's functions
-distributes materials by diffusion
-stores glycogen pigments and other materials
Describe the cytoskeleton
Proteins organized in fine filaments of slender tubes
List the functions of the cytoskeleton
-strength and support
-movement of cellular structures and materials
Describe microvilli
-membrane extensions containing microfilaments
List the functions of microvilli
-increase surgace area to facilitate absorption of extracellular materials
Describe centrosomes
-cytoplasm containing two centrioles and right angles
-each centriole is composed of 9 microtubule triplets
List the functions of centrosomes
-essential for movement of chromosomes during cell divsion
-organization of microtubules in cytoskeleton
Describe cilia
-membrane extensions containing microtubule doublets in a 9 + 2 array
List the functions of cilia
-movement of materials over cell surface
Describe ribosomes
-RNA + proteins
-fixed ribosomes bound to rough endoplasmic reticulum, free ribosomes scattered in cytoplasm
List the functions of ribosomes
-Protein synthesis
Describe mitochondria
-Produce 95% of the ATP required by the cell
Describe the nucleus.
-Nucleoplasm containing nucleotides, enzymes, nucleoproteins, and chromatin
-surrounded by double membrane (nuclear envelope) containing nuclear pores
List the functions of the nucleus
- Control of metabolism
-storage and processing of genetic information
-control of protein synthesis
Describe the nucleolus
-Dense region in the nucleoplasm containing DNA and RNA
List the functions of the nucleolus
-Site of rRNA synthesis and assembly of ribosomal subunits
Describe the Endoplasmic Reticulum
-Network of membranous channels extending throughout the cytoplasm
-smooth or rough
List the functions of the endoplasmic reticulum
-synthesis of secretory products
-intracellular storage and transport
Describe rough ER
-has ribosomes bound to membranes
List the functions of smooth ER
-Lipid and carbohydrate synthesis
-calcium ion storage
List the functions of rough ER
-Modification and packaging of newly synthesized proteins
Describe smooth ER
Lacks attached ribosomes
Describe the Golgi apparatus
-stacks of flattened membranes (cisternae) containing chambers
List the functions of the Golgi apparatus
-storage, alteration, and packaging of secretory products and lysosomal enzymes
Describe the lysosome
-Vesicles containing digestive enzymes
List the functions of the lysosome
-intracellular removal of damaged organelles or of pathogens
Describe peroxisomes
-vesicles containing degradative enzymes
List the functions of peroxisomes
-catabolism of fats and other organic compounds
-neutralization of toxic compounds generated in the process.