A measure of the clarity of the image; it is the minimum distance two points can be separated and still be distinguished as two separate points
Light microscopes (LMs)
Microscopes that use visible light to pass through the specimen and through glass lenses
A microscope that instead of using light, focuses a beam of electrons through the specimen or on its surface
Scanning electron microscope (SEM)
an electron microscope commonly used for detailed study of the surface of the specimen
Transmission electron microscope (TEM)
an electron microscope commonly used to study the internal ultrastructure of cells
Goal to take cells apart; Uses a centrifuge that spins like a merry-go-round at various speeds
Where the DNA is concentrated in the prokaryotic cell; no membrane separates this region from the rest of the cell
at the boundary of every cell, functions as a selective barrier; made of phospholipids and proteins
contains the chromatin, nucleolus, and nuclear envelope; contains most of the genes in the eukaryotic cell
Chromatin fibers that coiled up, becoming thick enough to be discerned as separate structures; occurs when cell prepares to divide
particles made of ribosomal RNA and protein; the organelles that carry out protein synthesis (free/bound)
Endoplasmic Reticulum (ER)
consists of a network of membranous tubules and sac; continuous with the nuclear envelope (smooth/rough)
structure in animal cells composed of cylinders of microtubule triplets; a pair involved in animal celll division
A center of manufacturing, warehousing, sorting, and shipping; modifies the products of the ER
A process that describes Amoebas/Protists eating by engulfing smaller organisms or other food particles
formed by phacogytosis; pinches off of the plasma membrane and encloses a food particle
The largest compartment in the plant cell; functions include storage, waste disposal, protection, and growth
a microbody containing enzymes that transfer hydrogen from various substrates to oxygen; produces hydrogen peroxide
a network of fibers extending throughout the cytoplasm; gives the cell mechanical support, maintains shape, provides anchorage for organelles, motility
the thickest of the three types of fibers that make up cytoskeleton; eukaryotic cells; hollow tube made from tubulin
the thinnest of the three types of fibers in cytoskeleton; two intertwined stands of actin
fibers with diameters in a middle range that make up cytoskeleton; fibrous proteins suercoiled into thicker cables
a large contractile protein forming the side-arms of microtubule doublets in cilia and flagella
a globular protein that links into chains, two of which twist helically about each other, forming microfilaments in muscle and other contractile elements in cells
porous holes between the plant cells; lets the cytoplasm become continous between the cells
secondary cell wall
a strong durable matrix often deposited in several laminated layers for plant cell protection and support
The substance in which animal tissue cells are embedded, consisting of protein and polysaccharides.
A glycoprotein in the extracellular matrix of animal cells that forms strong fibers, found extensively in connective tissue and bone; the most abundant protein in the animal kingdom.
A glycoprotein consisting of a small core protein with many carbohydrate chains attached, found in the extracellular matrix of animal cells. A proteoglycan may consist of up to 95% carbohydrate.
A receptor protein built into the plasma membrane that interconnects the extracellular matrix and the cytoskeleton.
Open channels in the cell wall of a plant through which strands of cytosol connect from an adjacent cell.
specialized junctions that hold adjacent cell together, consist of dense plate at point of adhesion plus extracellular cementing material
Membranes of neighboring cells are pressed together, preventing leakage of extracellular fluid
Points that provide cytoplasmic channels from one cell to another with special membrane proteins. Also called communicating junctions.
a structure resembling a centriole that produces a cilium or flagellum and anchors this structure within the plasma membrane
protein that moves along either actin filaments or microtubules and translocates organelles
A type of white blood cell that engulfs microbes and destroys them by phagocytosis; also presents microbial antigens to T cells, helping stimulate the immune response
a unique region (usually on one specific chromosome) that contains multiple repeats of genes encoding ribosomal RNA
A circular flow of cytoplasm, involving myosin and actin filaments, that speeds the distribution of materials within cells.