Molecular Techniques Flashcards Preview

Biochemistry 431 > Molecular Techniques > Flashcards

Flashcards in Molecular Techniques Deck (13):
1

Restriction Endonuclease

Cuts in the middle of the DNA sequence. Cuts Palindromes; Cuts in the exact spot, cuts at phosphodiester bond

2

Palindromes

sequences that read the same in the 5' to 3' direction.

3

How do organisms avoid using restriction endonucleases to cut their own DNA?

DNA modification. E.coli methylates self DNA.

4

Type II restriction endonuclease

produce 5' overhang

5

Types of Cloning Vectors

BACs and YACs, plasmids, bacteriophages

6

PCR Process

1) obtain DNA template 2) make complementary oligonucleotide primers 3) add primers (1000 fold) 4) heat DNA to make ssDNA 5) run DNA polymerase (TAq) 6) repeat heating, cooling, polymerase cycle. Note after cycle 3, target DNA available in high quantities. after 20 cycles, target 10^6 greater quantity.

7

Expression Vectors

Have everything normal vectors have, but also have promoter sequences, transcription termination sequences, , and a ribosome binding site.

8

DNA hybridization

mixtures of DNA ss; ones that have sequence homology illuminate. (application, to see if disease markers are present via hybridization and illumination.

9

DNA libraries

collection of plasmid vectors that each have recombinant DNA of the entire genome.

10

Colony hybridization

grow each cell that has recombinant DNA in a library; transfer cells to paper; lyse cell; denature DNA; hybridize with radioactive probe; wash and expose to X-ray film

11

Chain termination

dideoxy or Sanger's method; 3'-OH critical for linking nucleotide units; takes advantage of this fact by removing OH

12

Sanger Sequencing process

1)make ssDNA 2) add primer 3) Add nucleotides a dideoxynucleotides 4)creates fragments of DNA stopping at dideoxy nucleotides 5) run gel and read from the bottom of the gel upward

13

Next-gen Sequencing

Illumina DNA sequencing;

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