Begining of Biotechnologyx - AHSbognasnc4m

groupmoujeanteaBiotechnology

Oct 23, 2013 (3 years and 8 months ago)

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HOW BIOTECHNOLOGY
CAME ABOUT

The cell and DNA

Objectives:


Describe Prokaryotic and Eukaryotic cells.


Describe the location and shape of DNA in these
two types of cells.


Describe a phage (a kind of virus).


Describe the Hershey
-
Chase experiment


Describe the Four Nucleotides that make up DNA


Describe the structure of a DNA molecule.




Types of Cells

Two General types of cells:


1)
Prokaryotic cell


Bacterial

2)
Eukaryotic cell


All other organisms




(plant, fungi,
protista

and animals)

The Bacterium


Prokaryotic =

before the kernel (nucleus)

Note the lack of a nucleus and circular
strands of DNA


plasmids.

Plasmids


circles of DNA

Example of a Eukaryotic Cell


Eukaryote = True
kernel (nucleus)


Large number of
internal structures.


DNA is contained
within a nucleus

Viral Particles


Not cellular.


Composed of Protein


And Genetic Material
only (DNA or RNA).

The Hershey
-
Chase Experiment

Structure of DNA


DNA
(Deoxyribonucleic
acid) is a Nucleic Acid, it
consist of long chains of chemical units called
Nucleotides

Nucleotides has

three parts:


1) Phosphate


2) Sugar


3) Base

The Four Nucleotides


Two
Pyrimidines
:


Thymine (T)


Cytosine (C)



Two
Purines
:


Adenine (A)


Guanine (B)



How do Nucleotides combine to form a
strand of DNA?


Phosphate and Sugar
groups bond.


A bonds with T


C bonds with G

Visioning the DNA Molecule

Another View

Activity:


Examine prokaryotic and Eukaryotic cells using the
light microscope and models.


Create a DNA molecule.


Examine DNA molecule.