Unit 3 Cells Biochem Unit 3 Cells: TEKS for Biochemistry

Question Answer
Active Transport The movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is, from an area of lower concentration to one of higher concentration.
Adenosine Triphosphate (ATP) A compound composed of adenosine and three phosphate groups that supplies energy for many biochemical cellular processes by undergoing enzymatic hydrolysis. The energy for mitochondria.
Concentration Gradient Solutes,moving through a solution or gas from an area with a higher number of particles to an area with a lower number of particles. The areas are typically separated by a membrane.
Diffusion Passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration.
Endocytosis A process in which cell takes in materials from the outside by engulfing and fusing them with its plasma membrane.(E.X. proteins and hormones)
Endosymbiosis A symbiosis where in the symbiont lives within the body of its host and both benefit from the relationship.
Exocytosis Where the cell transports secretory products through the cytoplasm to the plasma membrane.
Facilitated Diffusion Where substances are transported across cell membranes by means of protein carrier molecules; also called facilitated transport.
Hypotonic A solution that has a lower osmotic pressure than another solution. Less solute and more water than another solution. Swells with water
Hypertonic * A concentration of solutes is greater inside the cell than outside of it,concentration of solutes is greater outside the cell than inside it. Shrinks in water
Isotonic Two solutions having the same osmotic pressure across a semipermeable membrane. Normal with water
Lysosome * An organelle that kills bacteria and dead organelles.
Membrane-Bound The organelles is located in the membrane.Bound to the membrane
Osmosis Net movement of water molecules through a semipermeable membrane from an area of higher water potential to an area of lower water potential.
Passive Transport Movement of ions and other atomic or molecular substances across cell membranes without need of energy input.
Permeability Capable of being permeated or passed through, used especially of substances where fluids can penetrate or pass through.
Rough Endoplasmic reticulum A network of tubular membranes within the cytoplasm of the cell, studded with ribosomes and involved in the transport of materials.
Selectively Permeable Membrane/Selectively permeable membrane A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a deferentially permeable membrane.Allows certain ions to pass by facilitated diffusion.
Smooth Endoplasmic Reticulum Main function of the smooth ER is to make cellular products like hormones and lipids.
Vesicle* Small structure within a cell, or extracellular, consisting of fluid enclosed by a lipid bilayer. Like veins on a arm.

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