1. Question of the Day 4-19 1. DNA replication and transcription occur in the _______, while translation occurs in the _______.

2. REVIEW 1. The 3 parts of a nucleotide = … 2. Cytosine pairs with _____ in DNA. 3. Monomer of a protein =

3. REVIEW Peptide Bond – Peptide Bond – –Covalent bond (sharing electrons) formed between two amino acids What holds nitrogenous bases together? – hydrogen bonds

4. DNA

5. The process of copying DNA = … – DNA replication REVIEW Enzyme that breaks hydrogen bonds between nitrogenous bases = … Enzyme that adds nucleotides to form a new strand of DNA = …

6. REVIEW Helicase –

7. Replication Fork – Replication Fork – –location where the DNA is splitting apart REVIEW

9. Question of the Day 4-20 1. Transcription makes ________ from DNA and then _________ makes proteins from _________.

10. Announcement 4-20 Unit # 8 Test will NOT be Friday 4-29 but sometime the following week!

11. Assignments 4-20 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

12. What is a codon? Codon = Three nitrogen bases that code for an amino acid There are “start” and “stop” codons There are “start” and “stop” codons The code is the exact same as in humans as in a virus or a skunk The code is the exact same as in humans as in a virus or a skunk Scientist see this as evidence that we all share a common ancestor Scientist see this as evidence that we all share a common ancestor

13. Practice:  What is UUU?  What is the start codon?

14. Practice: What is UGA? What are the stop codons?

16. Translation – Step by Step A ribosome attaches to the mRNA strand and tRNA molecules bring specific amino acids to the ribosome.

17. Translation – Step by Step AUG (methionine) signals the start of protein synthesis.

18. Translation – 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

19. 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. Translation – Step by Step

20. A chain of amino acids is formed until a stop codon is reached on the mRNA strand.

21. Translation Summary

22. http://www.youtube.com/watch?v=d1UPf7lXeO8 http://www.youtube.com/watch?v=FUA6_Ucw3i4 DNA SONGS:

23. Question of the Day 4-26 1. What is a codon? Where is it found? 2. What is an anticodon? Where is it found?

24. Announcement 4-26 Unit # 8 Test will be Tuesday 5-3!

26. Transcription and Translation

27. Assignments 4-26 Handout with book assignment at the end – due Thursday 4-28

28. Assignment 4-18 Handout Skim (read over) section 10.3 and complete questions #s 1-8 at the bottom of page 202 – my.hrw.com.

29. 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.

30. AUG (methionine) signals the start of protein synthesis. _________ (_______________) signals the start of protein synthesis.

31. 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 ___________________

32. 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 ______________________ ____________________________________.

33. 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.