9.1 Manipulating DNA Can Leave - mrsralph

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14 Δεκ 2012 (πριν από 4 χρόνια και 4 μήνες)

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9.1 Manipulating DNA

KEY CONCEPT

Biotechnology relies on cutting DNA at specific
places.

9.1 Manipulating DNA

Restriction enzymes cut DNA.


Restriction enzymes act as “molecular scissors.”


Collected from:

various types of bacteria


Cut
DNA
at:
a specific nucleotide sequence called a
restriction site

9.1 Manipulating DNA


R
estriction enzymes are used for:
cutting
DNA in
different ways.


each enzyme has a different restriction site

9.1 Manipulating DNA

Can Leave:



blunt ends
” (straight cut)



sticky ends
” (staggered cuts)

9.1 Manipulating DNA


Gel electrophoresis

is used
to separate DNA fragments
by size.


A DNA sample is cut with
restriction enzymes.


Electrical current pulls
DNA fragments through a
gel (big to small)

9.1 Manipulating DNA


A restriction map
shows:


The lengths of DNA
fragments between
restriction sites.


only indicate
size
, not
DNA sequence/order





useful
in genetic
engineering


used to study
mutations