The Cell Cycle Flashcards
This is the description of the overall cycle and the steps of interphsae.
The cell cycle is:
the series of events that cells go through as they grow and divide
The _____ _____ is the life of the cell from the time it is first formed form a dividing parent cell until its own division into two cells.
cell cycle
What three things happen during the cell cycle?
1) A cell grows
2) The cell prepares for division
3) The cell divides to form two daughter cells
What five major phases make up the cell cycle?
1) G₁ Phase (first gap)
2) S Phase (Synthesis)
3) G₂ Phase (second gap)
4) Mitosis
5) Cytokinesis
Before a cell can begin mitosis and actually divide, what two things must it do?
Form duplicates of its chromosomes, and produce a supply of organelles for the two daughter cells
During what phases does the cell duplicate its chromosomes and produce organelles for the daughter cells?
G₁, S, and G₂
What are these three phases collectively known as: G₁, S, and G₂?
Interphase
What happens in G₁ phase?
The cell doubles in size and the enzymes, cytoplasmic organelles, and other materials double in number.
What happens in S phase?
The DNA is replicated
What happens in G₂ phase?
The cell assembles the special structures needed for cell division.
When _____ is complete, the cell is ready to begin the process of cell division.
interphase
What percentage of the cell cycle does interphase account for?
90%
During interphase, the nucleus is well-defined and bounded by the _____ _____.
cell membrane
Outside of the nucleus are the two centrioles. What do they do?
They organize the microtubules into a spindle
Why is G₁ phase considered a period of intense biochemical activity?
The cell doubles in size and the enzymes, cytoplasmic organelles, and other molecules double in number
