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BS161 Exam 3
Ch. 12; Ch.16; Ch.17
15
Biology
Undergraduate 2
11/09/2011

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Term
M Phase
Definition
includes mitosis & cytokinesis
Term
G(1) Phase
Definition
First Phase of Interphase, most variable in length.
Term
S Phase
Definition
Part of Interphase when DNA is duplicated, about half the time of the cell cycle.
Term
G(2) Phase
Definition
Third Phase of interphase, cell grows and makes final preparations to divide
Term
Mitotic Spindle
Definition
includes centrosomes, spindle microtubules, and asters. Begins to form in cytoplasm during prophase
Term
Centrosome
Definition
subcellular region containing material that functions throughout the cell to organize the cell's microtubules.
Term
Kinetochore
Definition
structure of proteins associated with specific sections of chromosomal DNA at centromere.
Term
G(2) Phase
Definition
Phase when centrosome duplicates
Term
Prophase
Definition
Phase when chromatin starts to condense into chromosomes, Nucleoli disappear, mitotic spindle begins to form.
Term
Prometaphase
Definition
Phase when nuclear envelope breaks up, microtubules invade nuclear area, chromosomes fully condensed and microtubules attach to kinetochores.
Term
Metaphase
Definition
Phase when centrosomes are on complete opposite poles, chromosomes are in exact middle. Asters contact plasma membrane.
Term
Metaphase Plate
Definition
where the chromosomes convene in the middle of dividing cell.
Term
Anaphase
Definition
shortest stage of mitosis, begins when cohesin proteins are cleaved and sister chromatids separate. Chromosomes are pulled to the poles by microtubules.
Term
Seperase
Definition
Enzyme that cleaves cohesin proteins
Term
Telophase
Definition
Phase when two daughter nuclei form and nuclear envelope reappears. Nucleoli reappear and chromosomes become uncondensed. Microtubules depolymerize as well
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