membrane extensions containing microfilaments and increase surface area for absorption
Microvilli
fine protein filaments or tubes, – Strength and support – Intracellular movement of structures and materials
Cytoskeleton
STRUCTURE: RNA and proteins – Fixed: attached to endoplasmic reticulum – Free: scattered in cytoplasm
Ribosomes
• STRUCTURE: vesicles containing degradative enzymes • FUNCTION: – Catabolism of fats/other organic compounds – Neutralization of toxic compounds
Peroxisome
• STRUCTURE: vesicles containing digestive enzymes • FUNCTION: – Removal of damaged organelles or pathogen
Lysosome
Golgi apparatus / Golgi Body
• STRUCTURE: stacks of flattened membranes (cisternae) containing chambers • FUNCTION: storage, alteration, and packaging of synthesized products
• STRUCTURE: – Double membrane – Inner membrane contains metabolic enzymes • FUNCTION: production of 95% of cellular ATP
Mitochondria
• STRUCTURE: – Fluid nucleoplasm containing enzymes, proteins, DNA, and nucleotides – Surrounded by double membrane • FUNCTION: – Control of metabolism – Storage/processing of genetic information – Control of protein synthesis
Nucleus
• STRUCTURE: membranous sheets and channels • FUNCTION: synthesis of secretory products, storage, and transport
Endoplasmic reticulum (ER)
» No attached ribosomes » Synthesizes lipids and carbohydrates
Selectively permeable membrane that controls: • Entry of ions and nutrients • Elimination of wastes • Release of secretions
Plasma membrane
Nucleoid
The region within a prokaryotic cell where the genetic material (DNA) is located. It contains the bacterial chromosome and is involved in controlling gene expression and replication.