10-1 CELL GROWTH
Limits to Cell Growth
" DNA "Overload"
" Exchanging Materials
Cells are limited in size by their SURFACE AREA and VOLUME ratio
10-2 CELL DIVISION - Process where a cell splits into two identical daughter cells
" Mitosis - division of the nucleus
" Cytokinesis - division of the cytoplasm
CHROMOSOMES
" Made of DNA
" Found in Nucleus
" Number depends on organism
CELL CYCLE - events cells go through as they grow and divide
Mitosis
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Interphase (technically not part of mitosis, but it is included in the cell cycle) Cell is in a resting phase, performing cell functions DNA replicates (copies) Organelles double in number, to prepare for division |
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Prophase Spindle forms Centrioles move to opposite poles Chromosomes become visible |
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Metaphase Chromosomes line up along the equator |
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Anaphase Centromeres divide Chromatids separate and move to opposite poles |
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Telophase Nuclear membrane forms around each group of chromosomes Chromosomes unwind Cytokinesis begins |
Cytokinesis
The process by which the cytoplasm divides and one cell becomes two individual cells. The process is different in plants and animals
Animals - cell pinches inward
Plants - a new cell wall forms between the two new cells
