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Chapter 12
Study cards for LIFE 102 at CSU
36
Biology
Undergraduate 1
04/15/2015

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Term
Prokaryotic Cells
Definition
Single DNA molecule
Term
Eukaryotic Cells
Definition
A number of DNA molecules packaged into chromosomes
Term
Somatic Cells
Definition
Nonreproductive cells
Have two sets of chromosomes
Term
Gamete Cells
Definition
Reproductive cells
One set of chromosomes
Term
Chromatin
Definition
DNA and a protein which condenses during cell division
Term
Preparation for Cell Division
Definition
DNA is replicated and the chromosomes condense
Term
Sister Chromotids
Definition
Duplicated chromosomes
Term
Centromere
Definition
The narrow "waist" of the duplicated chromosome
Where the chromotids are most closely attached
Term
Eukaryotic Cell Division Consist of:
Definition
Mitosis - Division of nucleus
Cytokinesis - Division of the cytoplasm
Term
Meiosis Yields:
Definition

Nonidentical daughter cells

Each have one set of chromosomes (half as many as the parent cell)

Term
Cell Cycle
Definition
Mitotic (M) phase
Interphase
Term
Mitotic (M) Phase
Definition
Mitosis and Cytokiness
Term
Mitosis
Definition
Prophase
Prometaphase
Metaphase
Anaphase
Telophase
Term
Interphase
Definition
Cell growth and copying of chromosomes
Term
G1 Phase
Definition
"First gap" growth, part of interphase
Term
S Phase
Definition
"Synthesis" chromosome duplicates, part of interphase
Term
G2 Phase
Definition
"Second gap" growth, part of interphase
Term
Prophase
Definition
Spindle microtubules begin to form at centrosome. An aster extends from each centrosome
Term
Mitotic Spindle
Definition
Apparatus of microtubules that controls chromosomes movement
Term
Aster
Definition
A radial array of short microtubules
Term
Prometaphase
Definition
Some spindle microtublues attach to the kinetochores of chromosomes and begin to move the chromosomes
Term
Metaphase
Definition
Chromosomes are all lined up at the metaphase plate
Term
Metaphase Plate
Definition
The midway point between the spindle's two poles
Term
Anaphase
Definition
Sister chromatids separate and move along the kinetochore microtubule toward opposite ends of the cell
Term
Telophase
Definition
Nuclear envelope forms and nucleolus forms
Genetically identical daughter nuclei form at opposite ends of the cell
Term
Cytokinesis in Animal Cells
Definition
Occurs by a process known as cleavage forming a cleavage furrow
Term
Cytokinesis in Plant Cells
Definition
Cell plate forms
Term
Binary Fission
Definition
How prokaryotes reproduce.
The chromosome replicates, and the two daughter chromosomes actively move
apart
Term
Cell Cycle Control System
Definition
Allows or stops sequential events, regulated by both internal and external controls
Term
Checkpoints
Definition
Cell cycle stops until a go-ahead signal is received
Term
G0 Phase
Definition
Nondividing state, if a cell does not receive the go-ahead signal
Term
Regulatory Proteins
Definition
Cyclins and cyclin-dependent kinases (Cdks)
Term
MPF
Definition
Maturation-promoting factor
Triggers a cell's passage past the G2 checkpoint into the M phase
Term
Growth Factots
Definition
Proteins released by certain cells that stimulate other cells to divide
Term
Density-Dependent Inhibitor
Definition
Crowded cells stop dividing
Term
Anchorage Dependent
Definition
They must attached to a substrate in order to divide
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