Week 2 Discussion

Your initial post can address any of the following topics regarding lectures 4-6; pick one of these topics to write about (1 initial post is assigned).   Please begin with one of the following key words below. 

1. A question you have from the lecture, reading, or study outline. Explain what you know first then state your question. Highlight your question in bold.
2. An answer to a question from the study outline.
3. A summary of a key topic from this module.
4. An explanation of something you learned from another website/ video/ animation/ news article related to this module (include a link to your source).
5. Study question. 2 mock test questions with answers and explanations, related to this module.
6. A personal experience related to this module.

Week 2 Discussion Answer

This is the first enzyme to be isolated from E. coli that regulates DNA synthesis in an in vitro system. However, it cannot initiate DNA synthesis. It only directs the way each nucleotide is added to the growing chain and chain elongation is directed in the 5′ to 3′ direction. It possesses a 3′ to 5′ exonuclease activity in which it allows polymerization in one direction, stops, reverses the direction, and excises newly added nucleotide