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Cell Structure and Function Essay

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Below is an essay on "Cell Structure and Function" from Anti Essays, your source for research papers, essays, and term paper examples.

Ch   4     Cell Structure and Function



Introduction:


all organisms comprised of cells (human has about 75 trillion) and fluids


Cells:

basic structural unit/functional unit of life

        building blocks of all organisms

originate from preexisting cells

carry the hereditary information (DNA) to create copies of
                        themselves and control all their functions


Cell Structure:

despite great variation in size and function

all posses:

flexible bubble like plasma membrane

that wraps jellylike cytoplasm

suspended in this jelly like cytoplasm are a variety of
organelles:

site of specialized function in cell city



Two Fundamental Cell Types:

Procaryotic cells:

bacteria

very simple small cells
genetic material (DNA) floats free in center of cell:

not wrapped in nuclear membrane


lack many of membrane bound organelles:

many functions spread out within cell

not concentrated in one region/no centralization
of tasks


despite small size and simplicity have rapid rate
of growth and division

tremendous metabolic diversity


*reserve bacteria and archae to 102



Eucaryotic Cells:

much large, more complex cells

all other cells including plant, animal and protist cells

central membrane nucleus holds DNA


many specialized organelles:

organelles that are membrane bound have advantage of compartmentalized/organized
biochemical activity

more efficient regionalized cellular
tasks

concentration of material and equipment
need to perform certain functions:



eg:   powerhouse

manufacturing and packaging   centers

shipping centers

transportation system

emergency self destruct station




Cell Size:

limited by requirement that all...

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