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The Cell Cycle

 Cells go through a series of events known as the cell cycle o During this cycle, the cell grows, prepares for division, and divides to form two daughter cells
• Each daughter cell moves into a new cell cycle of activity

 Prokaryote cell cycle o A form of reproduction known as binary fission
• Once the chromosome is replicated, the two DNA molecules attach to different regions of the cell membrane
• Fibers in the cell stretch the cell apart
• The fibers pinch the center in
• Divides the cytoplasm and copied DNA into two new cells

 The eukaryote cell cycle occurs in several stages o o o
Interphase
• Consists of 3 parts
•
Gap 1, Synthesis, and
Gap 2
M Phase
• Cell division
The length of the cell cycle in eukaryotes varies between types of cells

 Interphase o The longest stage of the cell cycle o A time when the cell carries on its usual functions
• Dependent on location in the body o Gets ready to divide o Consists of three parts
• Gap1, Synthesis, Gap 2

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What are the 3 phases of interphase?

Gap 1 (G1) Synthesis
 Undergoes significant growth o o doubles its organelles
Makes new proteins
 Accumulates the materials needed for DNA synthesis o Includes building enzymes, nucleotides,
 DNA replication occurs o Each chromosome is composed of one coiled DNA o A single chromatid is replicated into two sister chromatids

Gap 2
 Shortest of the three phases of interphase
 Production of organelles needed for cell division are produced o o
Spindle fibers form
• Made of microtubules
Centriole
• Assists in the separation of sister chromatids

 M Phase- Cell division o Follows interphase o Produces two daughter cells
• Identical to each other o Usually takes place quickly in comparison to interphase o Can be divided into two phases
• Mitosis- division of the nucleus
• Cytokinesis- division of the cytoplasm

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What is the end result after a cell goes through the entire cell cycle?