Honors Bio- 10/22
Card Set Information
Honors Bio- 10/22
What phase are MOST cells in? Why? Explain.
Interphase, doesn't take long for stages of mytosis.
Do all cells divide? If not, what are cells that do not divide?
No, brain cells
What is the division of cytoplasm called?
What is the division of a nucleus called?
What are spindle fibers?
Spindle fibers are thin strands that attach to sister chromatids to pull them apart during anaphase
What is centromere?
The place on the sister chromatids where it is crossed and where the spindle fibers attach
What is centriole?
the part of the cell that produces spindle fibers
Why do the sister chromatids need to be made?
So the DNA can be replicated and cells can be reproduced
When are the sisrer chromatids created?
How are the sister chromatids related to one another?
Identical copies of chromosomes
When are the chromosomes first visible?
What form is the DNA in during interphase?
What is chromatin?
Long loose threads
This form during most of the cell cycle
What is a chromosome?
What are the different forms of DNA in the cell cycle?
Chromatin, Chromosomes, Sister Chromatids
How is cytokinesis different in plants and animals?
: cell plate
: cleavage furrow
What is cytokinesis?
Cytoplasm pinches in half
Each daughter cells (2) has identical set of duplicate chromosomes
What occurs in telophase?
Chromosomes gather at opposite ends of cell
Chromosomes unwind to form the threadlike chromatin again
Two nuclear membranes form
What occurs in anaphase?
Sister chromatids seperate
What occurs in metaphase?
Chromosomes line up in the middle of the cell
Chromosomes connect to spindle fibers at centromere
What occurs in prophase?
Chromatin condenses (forms chromosomes)
Centrioles seperate (begin to form spindle)
Nuclear membrane and nucleus begin to break down
What are the four phases of mitosis (in order)?
Prophase, Metaphase, Anaphase, Telophase
What occurs in G2?
Cell prepares for mitosis
Checks to see if DNA is fully replicated and if there is proper growth/organelles
What occurs in S?
DNA is replicated, sister chromatids are made
What occurs in G1?
Checkpoint to check if there is a need for cells and if the DNA is damaged
If not, remain in resting phase (G0)
What are the three phases of interphase (in order)?
G1, S, G2
What are the three phases of the cell cycle (in order)?
Interphase, Mitosis, Cytokinesis
What are two problems that cell growth causes?
Larger cells which have more demands
Volume is increasing faster than the surface area
What is the name of the process in which prokaryotic cells divide?
Reproduction- binary fission
Why do prokaryotic cells divide?
To reproduce- binary fission
Only have one circular chromosome
Why do eukaryotic cells divide?
To replace dead cells, repair damaged tissue, growth of an organism, problem of cell growth