Interphase and M phase
The two parts or halves of the cell cycle.
period of the cycle between cell divisions, including G1 phase, S phase and G2 phase
period of time when mitosis and cell division occur
Phase including growing, synthesizing new proteins and organelles, and doing their jobs. It is the longest phase of the cell cycle.
Phase where chromosomes (DNA) are replicated and key preoteins associated with replication are made (centromeres)
Shortest of the three phases, where organelles and molecules for cell division are produced (centrioles). It is the check up phase before mitosis.
A complex of DNA and proteins in the cell nucleus that condenses to form chromosomes during cell division.
Condensed Chromatin (changes before mitosis begins)
False (humans - 46, fruit fly cells - 8, king crab cells - 208)
All organisms have the same number of chromosomes. (True or False?)
Two identical copies of a chromosome made during the cell cycle (before cell division takes place)
area where the chromatids of a chromosome are attached
Prophase, Metaphase, Anaphase, Telophase (PMAT)
The order of Mitosis
1st part of mistosis; the chromatin condenses into chromosomes, the nucleoli and nuclear envelope breaks down, the spindle fibers form a bridge across the cell, the centrioles migrate to opposite poles of the cell
Chromosomes lined up at equator of cell, spindle fibers from each centriole are attached to the centromeres of the chromosomes, the nuclear membrane has disappeared
The centromeres split, and the sister chromatids separate as each is pulled to an opposite pole.
Last part of mitosis; chromosomes become longer, thinner & less distinct, new nuclear membranes form, nucleolus reappears, cell division is nearly complete. Furrowing occurs.
Cytoplasmic division and other changes exclusive of nuclear division that are a part of mitosis or meiosis. In plants, a cell plate forms.
proteins that respond to events inside the cell, work in the G2 phase
(internal regulator) one of a family of closely related proteins that regulate the cell cycle in eukaryotic cells
Protein that periodically rises and falls in concentration in step with the eukaryotic cell cycle. They activate crucial protein kinases (called cyclin-dependent protein kinases, or CDK) and thereby help control the progression from one stage of the cell cycle to the next. Cascade of events!!
Proteins that respond to events outside the cell. They direct cells to speed up or slow down the cell cycle.
Among the most important external regulators, tells cells to speed up division
Molecules found on surfaces of neighboring cells often cause cells to slow down or stop their cell cycles (True of False?)
Over 50% of cancer cells have a defect in the:
The common thread in all cancers is that control over the cell cycle has broken down. (True or False?
A tumor suppressor gene found mutated in about half of human cancers. It encodes a gene regulatory protein that is activated by damaged DNA and is involved in blocking further progression of the cell cycle.