Cell Division Flashcards
Why do cells divide? 3 Reasons
Reproduction
Growth
Repair
Basis of cell theory?
All cells come from preexisting cells
When genetic material packed dense they are _______ when loose they are ______.
Chromosomes
Chromatin
In speaking of the ‘function’ of genes, we’re speaking of:
Chromatin
If a cell isn’t dividing we say it’s in:
Interphase
In interphase DNA exist as..
Chromatin
In human cells there are __ chromosomes.
46
T/F # of chromosomes is an indicator of complexity of the organism.
FALSE - Depends on what genes are on chromosomes
Double helices wrap around proteins called..
Histones
When coiled they form a supercoil made up of..
Chromatin Fiber
DNA as chromosomes are usable. T/F?
FALSE - Unusable until they’re chromatin
One linear piece of physically attached DNA
Chromosome
Once a chromosome is copied each copy is called a…
Sister Chromatid
Before replication DNA is in this state.
Double strand, but one copy. One double helix.
After replication?
Double strand, 2 copies! 2 Single Stranded chromosomes.
A cell that divides must _______ then _______.
Duplicate
Seperate
The main difference between mitosis and binary fission?
Binary fission is Non-Stop!! Repeated divisions and identical cells
Mitosis =
1 Replication, 1 Division, 2 Identical daughters
Meiosis =
1 Replication, 2 Divisions, 4 Unique daughters
During which phase of Mitosis do chromosomes become visible?
Prophase!
In the cell cycle, in what phase do Mitosis & Cytokinesis occur?
M Phase
This phase accounts for 90% of the cell cycle.
Interphase
During interphase the cell is…
Doing it’s job. Cellular respiration, working, moving, preparing for division (If it’s going to) cell growth & organelle expansion.
In the G1 Phase, the cells are..
Working, growing, ignoring DNA
From G1 they move to –>
S Phase (Synthesis)
During the S phase?
Starts to copy DNA 8 to 88
Once synthisized, the cells move into ___ to get ready for division.
G2
Once ready in the G2 phase the cell will move into the..
M Phase
