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Chapter 16 Collaboration 2010
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Collaboration Teams - Members share responsibility for posting refined answers to the guided readings - succinct, relevant, clear, and with pictures or a video to compliment.
When contributing to the reading guide, follow these steps:
1) First complete the reading guide on your own from the DNA unit page.
2) Write your response to a question in word and then copy it. Be sure to upload pictures and/or video for each question.
3) Click on the edit button and then go to the appropriate question and paste your answer below it. Sign your contribution with your first name and last initial and TEAM COLOR
4) Save the page by selecting "Save with comment" from the Save dropdown. Enter a comment (e.g. "I answered chp 26 question 3" - Tom S.) then click Save.
Mr. V Jr.
1. Explain Griffith’s experiment and the concept of transformation in detail.
In 1928 Fredrerick Grifith was studying Streptococcus pneumonia that causes pneumonia in mammals.
Griffith had two strands of the bacterium a pathogenic (disease-causing) one and a nonpathogenic (harmless) strand.
He killed the pathogenic strand with heat and mixed the cells remains with living bacteria of the nonpathogenic strand, some of the living cells became pathogenic.
Transformation is a change in genotype and phenotype due to the assimilation of external DNA by a cell. so in layman's words: a DNA of another cell (bacteria/virus) changes the DNA of the host cell.
2. What did Avery, MacLeod and McCarty contribute to this line of investigation?
They used the Griffith's experiment to figure out that the transforming agent in the bacteria which switched it from harmless to harmful was DNA
3. What is a bacteriophage? is a virus that inflects bacteria also called a phage.
4. Label the diagram below and explain the Hershey Chase experiment.
5. How did Chargraff’s work contribute to understanding the structure of DNA?
He reported that DNA composition varies from one species to another, which accounts for the genetic variation found between different species. He also found a peculiar regularity in the ratios of nucleotide bases within a single species. The DNA composition changes from species to species, but it is consistent within the same species.
6. Why was Rosalind’s Franklin’s work essential to the understanding of the structure of DNA?
She discovered the structure of a DNA molecule and was inches away from figuring out the double helix until Watson and Crick unfairly gained possession of the slides and made the connection.
this is her photograph from which the double helix was identified.
7. Upload a labeled diagram of DNA and explain what is meant by 5’-3’
The 5'end is attached to a phosphate it is the 5th carbon in the ring. The 3' has a hydrolyze coming from its end. The 5' always begins and the 3' always end, they always go with each other.
8. Why does adenine always pair with thymine and guanine with cytosine in DNA?
First off, adenine and guanine are both purines, nitrogenous bases made of two carbon rings. Cytosine and Thymine are pyrimidines, nitrogenous bases with only one carbon ring. They