bio week six?
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Cell theory
All known living things are made up of one or more cells
Unicellular organism
made up of only one cell that carries out all of the functions needed by the organism
Colony
a cluster of cells, usually derived from a single parent cell, growing on the surface of or within a solid medium.
Multicellular organism
an organism composed of many cells
Tissue
a group of cells that have similar structure and that function together as a unit
Organ
a collection of tissues that structurally form a functional unit specialized to perform a particular function
Organ system
a biological system consisting of a group of organs that work together to perform one or more functions
Organelle
a subcellular structure that has one or more specific jobs to perform in the cell
Eukaryote
any cell or organism that possesses a clearly defined nucleus
Prokaryote
any organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes
Cytoplasm
the gelatinous liquid that fills the inside of a cell. It is composed of water, salts, and various organic molecules. Some intracellular organelles, such the nucleus and mitochondria, are enclosed by membranes that separate them from the cytoplasm
Cytoskeleton
made up of microtubules, actin filaments, and intermediate filaments. These structures give the cell its shape and help organize the cell’s parts
Flagellum
hairlike structure that acts primarily as an organelle of locomotion in the cells of many living organisms
Nucleoid
those DNA–protein assemblies which contain the genomes of prokaryotic organisms and eukaryotic organelles
Capsule
a large structure common to many bacteria. It is a polysaccharide layer that lies outside the cell envelope
Ribosome
A ribosome is an intercellular structure made of both RNA and protein, and it is the site of protein synthesis in the cell.
Homeostasis
any self-regulating process by which biological systems tend to maintain stability while adjusting to conditions that are optimal for survival
Positive feedback
occurs to increase the change or output: the result of a reaction is amplified to make it occur more quickly
Negative feedback
a normal biological response in which the effects of a reaction slow or stop that reaction
Osmosis
how water molecules move across a semipermeable membrane that separates two solutions
Hypertonic solution
any external solution that has a high solute concentration and low water concentration compared to body fluids
Hypotonic solution
a solution containing a lower amount of solute in comparison to the solute concentration in other solutions, across a semipermeable membrane
Isotonic solution
any external solution that has the same solute concentration and water concentration compared to body fluids
Passive transport
Passive transport is a type of membrane transport that does not require energy to move substances across cell membranes.