Definitions Flashcards
The Cell Theory
Living organisms are composed of cells.
Cells are the smallest units of life.
Cells come from pre-existing cells.
All Functions of Life (6)
Metabolism: respiration and excretion. Response: sensitivity. Growth: in cell size and number Reproduction: whether sexual or asexual Homeostasis: stable condition in body Nutrition: food
Cell wall
Protects the cell from outside and bursting.
Plasma membrane
Controls which material enters and leave the cell by active or passive transport. Selectively permeable.
Cytoplasm
Water fluid containing enzymes which controls metabolic reactions in cell.
Pili
Thin protein tubes. Found outside the plasma membrane.
Flagella
Long thread-like structure, made of protein. Helps with movement for bacteria.
Ribosome
Produces proteins
Nucleoid region
Contains DNA, genetic material.
Rough endoplasmic reticulum RER
Modifies the transport of proteins.
Lysosome
A organelle containing enzymes, digest particles.
Golgi apparatus
An organelle which package proteins before being sent to its final destination.
Mitochondrion
Responsible for aerobic respiration. Converts chemical energy into active transport by using oxygen.
Nucleus
Contains chromosomes and is the controlling part of the cell.
Smooth endoplasmic reticulum
In cytoplasm, transports proteins.
Pinocytotic vesicle
A mechanism by which cells ingest extra cellular fluid and its content, helps the cell membrane form vacuoles.
Nuclear Envelope
A double-layered membrane enclosing the nucleus of a eukaryotic cell. Allow passagr in and out of materials to nucleus.
Nuclear pore
An octagonal opening where the inner and outer membrane of the nuclear are continous.
Chromatin
The substance of chromosomes
Vesicle
A small bladderlike cell.
Microvillus
Any of the minute hairlike structures projecting from the surface of certain types of epithelial cells, especially those of the small intestine.
