Lecture10_25 - different amino acids? If three nucleotides...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
2/3/11 Main Points Exam summary Finish replication handout
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/3/11 0 2 4 6 8 10 12 Exam 2 Scores A = 83- 105 A- = 81- 82 B+ = 79-80 B = 75-78 B- = 73-74 C+ = 71-72 C = 65-70 C- = 63-64 D+ = 61-62 D = 55-60 D- = 53-54
Background image of page 2
Click to edit Master subtitle style 2/3/11 Genetic information is stored in DNA.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/3/11 Fig. 17-4 DNA molecu le Gen e 1 Gene 2 Gen e 3 DNA templa te strand TRANSCRIPTI ON TRANSLATIO N mRN A Prot ein Cod on Amino
Background image of page 4
2/3/11 509359106282174712397115930 428590503174506830269583756 22094762
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2/3/11 The Genetic Code How can a DNA molecule with only four different nucleotides be used to make a protein with 20 different amino acids? If only one nucleotide codes for an amino acid, there would be four possible combinations. If two nucleotides code for an amino acid, there would be 16 possible combinations (42). If three nucleotides code for an amino acid, there would be 64 possible combinations (43).
Background image of page 6
2/3/11 The Genetic Code How can a DNA molecule with only four different nucleotides be used to make a protein with 20
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: different amino acids? If three nucleotides code for an amino acid, there would be 64 possible combinations (43). 3 nucleotides or bases = 1 codon = 1 amino acid There are more codons than amino acids, so there is redundancy in the code. Most amino acids are coded by more than one codon. 2/3/11 Fig. 17-5 Second m RNA base First m RNA base (5 end of codon) Third mRNA base (3 2/3/11 Fig. 17-23a W ild type 3 DNA tem plate st rand 3 3 5 5 5 m R NA Prot ein Am ino end St op Carboxyl end 2/3/11 Fig. 17-23a Wild type 3 i DNA template strand 3 i 3 i 5 i 5 i 5 i mR NA Prot ein Amino end St op Carboxyl end A instead of G 3 i 3 i 3 i U instead of C 5 i 5 i 5 i St op Silent (no effect on amino acid sequence) 2/3/11 Fig. 17-7b Elongat ion RNA polym er ase Nontem pl at e strand of DNA RNA nucleotides 3 end Direction of transcriptio n ( downstre am ) Tem plate strand of DNA Newly m ade RNA 3 5 5...
View Full Document

Page1 / 11

Lecture10_25 - different amino acids? If three nucleotides...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online