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Question of the Question of the DayDay
4-191. DNA replication and
transcription occur in the _______, while translation occurs in the _______.
REVIEWREVIEW1. The 3 parts of a nucleotide = …
2. Cytosine pairs with _____ in DNA.
3. Monomer of a protein =
REVIEWREVIEW Peptide BondPeptide Bond – –
– Covalent bond (sharing Covalent bond (sharing electrons) formed between two electrons) formed between two amino acidsamino acids
What holds nitrogenous bases What holds nitrogenous bases together?together?
– – hydrogen bondshydrogen bonds
DNADNA
The process of copying DNA = …The process of copying DNA = …
– – DNA replicationDNA replication
REVIEWREVIEW
Enzyme that breaks hydrogen bonds between nitrogenous bases = …
Enzyme that adds nucleotides to form a new strand of DNA = …
REVIEWREVIEWHelicaseHelicase – –
Replication ForkReplication Fork – – – location where the DNA is splitting location where the DNA is splitting
apartapart
REVIEWREVIEW
Question of the Question of the DayDay
4-201. Transcription makes ________
from DNA and then _________ makes proteins from _________.
AnnouncementAnnouncement4-20
Unit # 8 Test will NOT be Friday 4-29 but sometime the following week!
AssignmentsAssignments4-20
Skim (read over) section 10.3 and complete questions #s 1-8 at the bottom of page 202 – my.hrw.com. – due NOW
Webquest – DNA Transcription and Translation – due NOW
What is a codonWhat is a codon??Codon = Codon = Three nitrogen bases that Three nitrogen bases that
code for an amino acidcode for an amino acid There are “There are “startstart” and “” and “stopstop” ”
codonscodons The code is the exact same as The code is the exact same as in in
humans as in a virus or a skunkhumans as in a virus or a skunk Scientist see this as evidence that Scientist see this as evidence that
we all share a common ancestorwe all share a common ancestor
PracticePractice:: What is UUU?What is UUU? What is the start codon?What is the start codon?
PracticePractice::What is UGA?What is UGA?What are the stop What are the stop codons?codons?
Translation – Step by StepTranslation – Step by Step
A ribosome attaches to the mRNA strand and tRNA molecules bring specific amino acids to the ribosome.
Translation – Step by StepTranslation – Step by Step
AUG (methionine) signals the start of protein synthesis.
Translation – Step by StepTranslation – Step by Step
tRNA molecules continue along the mRNA strand bringing with them the corresponding amino acids. The amino acids are connected by peptide bonds
After the peptide bond is formed, the ribosome slides along to the next codon. The tRNA no longer carrying an amino acid is released, and a new tRNA carrying another amino acid can attach.
TranslatioTranslation – Step n – Step by Stepby Step
Translation – Step by StepTranslation – Step by Step
A chain of amino acids is formed until a stop codon is reached on the mRNA strand.
Translation SummaryTranslation Summary
http://www.youtube.com/watch?v=d1UPf7lXeO8
http://www.youtube.com/watch?v=FUA6_Ucw3i4
DNA SONGS:DNA SONGS:
Question of the Question of the DayDay
4-261. What is a codon? Where
is it found?
2. What is an anticodon? Where is it found?
AnnouncementAnnouncement4-26
Unit # 8 Test will be Tuesday 5-3!
Transcription and TranslationTranscription and Translation
AssignmentsAssignments4-26
Handout with book assignment at the end – due Thursday 4-28
AssignmentAssignment4-18
Handout
Skim (read over) section 10.3 and complete questions #s 1-8 at the bottom of page 202 – my.hrw.com.
A ribosome attaches to the mRNA strand and tRNA molecules bring specific amino acids to the ribosome.
A ______________ attaches to the mRNA strand and _______________________ bring specific amino acids to the ribosome.
AUG (methionine) signals the start of protein synthesis.
_________ (_______________) signals the start of protein synthesis.
tRNA molecules continue along the mRNA strand bringing with them the corresponding amino acids. The amino acids are connected by peptide bonds
____________________________________________________________ bringing with them the corresponding amino acids. The amino acids are connected by ___________________
After the peptide bond is formed, the ribosome slides along to the next codon. The tRNA no longer carrying an amino acid is released, and a new tRNA carrying another amino acid can attach.
After the peptide bond is formed, ________ ____________________________________. The tRNA no longer carrying an amino acid is released, and ______________________ ____________________________________.
A chain of amino acids is formed until a stop codon is reached on the mRNA strand.
A chain of amino acids is formed until a ______________________ is reached on the mRNA strand.