The cell interior Flashcards
Three main parts of the cytoskeleton
Microfilaments
Intermediate
Microtubules
Forms terminal web
Made of actin protein
6 nm thick
Microfilaments
8-10nm thick, within skin cells
Made of protein keratin
Give cell shape and resists stress
Intermediate filaments
25nm thick
Consist of protein tubulin
Radiate from centrosome, can come and go
Maintain cell shape, hold organelles, act as railroad tracks for walking motor proteins, make axonemes of cilia and flagella, form mitotic spindle
Microtubules
Structure of the cell
Carry out specialized metabolic tasks
Organelles
5 Organelles
membranous organelle Nonmembranous organelle Nucleus - Largest organelle Nuclear envelope - Double membrane around nucleus Nucleoplasm - Material in nucleus
System of channels enclosed by membrane
Endoplasmic reticulum
Parallel, flattened sacs covered with ribosomes
Rough Endoplasmic Reticulum
No ribosomes
Synthesizes steroids and other lipids
Detoxifies alcohol and other drugs
Calcium storage
Smooth endoplasmic reticulum
Small granules of proteins and RNA
Ribosomes
Read coded genetic messages and assembles amino acids into proteins specified by the code
Ribosomes
Free ribosomes produce ____ for _____ ______ the cell
Proteins for use within
Fixed ribosomes, attached to RER, produce ______ for ______
Proteins for export
A system of cisternae that synthesizes carbohydrates and puts finishing touches on protein synthesis
Golgi Complex
Receives newly synthesized proteins from rough ER
Golgi complex