KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions. The cell cycle represents the life cycle of a cell. The cell cycle has three main stages:. (1) INTERPHASE (a) G 1 : cell grows, organelles double in number; cell does its job.
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KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.
Stem Cells are the focus of much research to find ways to create new cells of these types.
5.2 KEY CONCEPT The goal of mitosis/cytokinesis is to make 2 identical daughter cells.
(2) DNA coils around proteins called histones.
(1) DNA is copied in S period of Interphase.
KEY CONCEPT “package” the DNAThe goal of mitosis/cytokinesis is to make 2 identical daughter cells.
Sister chromatids “package” the DNA
Duplicated chromosomeChromosome vocabulary
(1) Prophase “package” the DNA
(2) Metaphase “package” the DNA
(4) Telophase “package” the DNA
5.3 KEY CONCEPT “package” the DNATo remain healthy, mitosis must be controlled.
normal cell “package” the DNA
bloodstreamIn cancer, mitosis is uncontrolled.
Why are cancer cells a problem?
They do not do their jobs!
Cell Organization “package” the DNACells are organized to carry out complex functions
SYSTEMS “package” the DNA
rootMulticellular organisms depend on interactions among different cell types.
Inner: intestines “package” the DNA
Outer: skin cells
Middle: bone cellsSpecialized cells perform specific functions.
Before a cell differentiates (gets its job), it’s “package” the DNAa stem cell.
There are three types of stem cells:
First, an egg is fertilized by a sperm cell in a petri dish. The egg divides, forming an inner cell mass. These cells are then removed and grown with nutrients. Scientists try to control how the cells specialize by adding or removing certain molecules.