Terms in this set (22)
Deoxyribonucleic acid (DNA)
The instructions for making cell parts are encoded in the ____________________.
The DNA of prokaryotes (bacteria) is one, ____________________ attached to the inside of the cell membrane
10 and 50
Most eukaryotes have between ___________________ chromosomes in their body cells
Human body cells have ____________________ chromosomes.
Chromosomes can't be seen when cells aren't dividing and are called ____________________.
Duplicated chromosomes are called ___________________ & are held together by the centromere.
_______________________ involves a single cell dividing to make 2 new, identical daughter cells.
_______________________ involves two cells (egg & sperm) joining to make a new cell (zygote) that is NOT identical to the original cells
Prokaryotes such as bacteria divide into 2 identical cells by the process of _____________________.
G1 stage of interphase
Cells mature by making more cytoplasm & organelles; cell carries on its normal metabolic activities first stage
Synthesis stage of interphase
DNA is copied or replicated first stage
G2 stage of interphase
Occurs after DNA has been copied; all cell structures needed for division are made (e.g. centrioles); both organelles & proteins are synthesized first stage
also called karyokinesis; only occurs in eukaryotes
Early Prophase (Mitosis)
Chromatin in nucleus condenses to form visible chromosomes, mitotic spindle forms from fibers in cytoskeleton or centrioles (animal) second stage
Late Prophase (Mitosis)
Nuclear membrane & nucleolus are broken down; chromosomes continue condensing & are clearly visible; spindle fibers called kinetochores attach to the centromere of each chromosome second stage
Chromosomes, attached to the kinetochore fibers, move to the center of the cell; chromosomes are now lined up at the equator third stage
Sister chromatids at opposite poles; spindle disassembles; nuclear envelope forms around each set of sister chromatids; nucleolus reappears; CYTOKINESIS occurs fifth stage
Sister chromatids are pulled apart to opposite poles of the cell by kinetochore fibers fourth stage
Means division of the cytoplasm; division of cell into two, identical halves called daughter cells sixth stage
In eukaryotic cell division, cells are ________________.
___________________ are special proteins that increase the chance that a normal cell develops into a tumor cell
If mitosis is not controlled, unlimited cell division occurs causing ___________________
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