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idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells
the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities
dense masses of RNA and protein that manufacture ribosomes, several of these are located in the nucleus.
thin outer boundary of a cell that regulates the traffic of chemicals between the cell and its surroundings
Membranes of neighboring cells are pressed together, preventing leakage of extracellular fluid
specialized junctions that hold adjacent cell together, consist of dense plate at point of adhesion plus extracellular cementing material
the tiny, fluid-filled tunnels characteristic of gap junctions that connect neighboring cells
a cell organelle that helps make and package materials to be transported out of the cell
carries proteins to the cell membrane so that they can be released into the extracellular fluid
A network of fibers that holds the cell together, helps the cell to keep its shape, and aids in movement
Within the cell, are composed of water plus concentration of potassium and phosphates
liquid found between the cells of the body that provides much of the liquid environment of the body
a process in which a membrane allows some molecules to pass through while keeping others out
the process by which molecules move from an area of higher concentration to an area of lower concentration
the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins
a carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell
process in which extensions of cytoplasm surround and engulf large particles and take them into the cell
the first stage of mitosis or meiosis in eukaryotic cell division, during which the nuclear envelope breaks down and strands of chromatin form into chromosomes
second phase of mitosis, during which the chromosomes line up across the center of the cell
The phase of cell division during which the nuclear membrane re- appears and the chromosomes disappear
The first sign of cleavage in an animal cell; a shallow groove in the cell surface near the old metaphase plate.
Messenger Ribonucleic Acid
a transcription of a gene that combines with ribosomal RNA (rRNA) and transfer RNA (tRNA
process in which part of the nucleotide sequence of DNA is copied into a complementary sequence in RNA
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