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26 Cards in this Set

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  • Back
Absorption
The transport of dissolved substances into cells
Activation energy
Energy necessary to get a chemical reaction going
Active transport
Movement of molecules through the plasma membrane (typically opposite the dictates of osmosis or diffusion) aided by a chemical process
Anticondon
A three-nucleoctide sequence on tRNA
Cell wall
A rigid substance on the outside of certain cells, usually plant and bacteria cells
Central vacuole
A large vacuole that rests at the center of most plant cells and is filled with a solution which contains a high concentration of solutes
Chromatin
Clusters of DNA and proteins in the nucleus
Chromoplasts
Organelles that contain pigments used in photosynthesis
Codon
A sequence of three nucleotides on mRNA that refer to a specific type of amino acid
Cytology
The study of cells
Cytolysis
The rupturing of a cell due to excess internal pressure
Cytoplasm
A jelly-like fluid inside the cell in which the organelles are suspended
Cytoplasmic streaming
The motion of the cytoplams which results in a coordinated movement of the cell's organelles
Digestion
The breakdown of absorbed substances
Egestion
The removal of non-soluble waste materials
Endoplasmic reticulum
An organelle composed of an extensive network of folded membranes which perform several tasks within a cell
Excretion
The removal of soluble waste materials
Golgi bodies
The organelles where proteins and lipids are stored and then modified to suit the needs of the cell
Homeostasis
Maintaining the status quo in a cell
Hypertonic solution
A solution in which the concentration of solutes is greater than that of the cell which resides in the solution
Ions
Substances in which at least one atom has an imbalance of protons and electrons
Isotonic solution
A solution in which the concentration of solutes is essentially equal to that of the cell which resides in the solution
Leucoplasts
Organelles that store starches or oils
Respiration
The break-down of food molecules with a release of energy
Secretion
The release of biosynthesized substances for use by other cells
Reproduction
Producing more cells