In the experiment of Avery, McLeod, and McCarty, the additionof RNase or protease to a DNA extracta. prevented the conversion of type S bacteria into type R bacteria.b. allowed the conversion of type S bacteria into type R bacteria.c. prevented the conversion of type R bacteria into type S bacteria.d. allowed the conversion of type R bacteria into type S bacteria.

In the experiment of Avery, McLeod, and McCarty, the additionof RNase or protease to a DNA extracta. prevented the conversion of type S bacteria into type R bacteria.b. allowed the conversion of type S bacteria into type R bacteria.c. prevented the conversion of type R bacteria into type S bacteria.d. allowed the conversion of type R bacteria into type S bacteria.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter10: Biotechnology

Section: Chapter Questions

Problem 5RQ: What is a genetically modified organism (GMO)? a. a plant with certain genes removed b. an organism...

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Griffith discovered a “transforming factor” in bacteria that conveyed infectiousness in 1928. In 1944, Avery, MacLeod and McCarty showed that the transforming factor is DNA A. Both statements are correct B. Both statements are incorrect C. First statements is correct. Second statement is incorrect D. First statements is incorrect. Second statement is correct
Which of the following is not one of the ways that Avery’s transforming principle resembles DNA?a. It migrates like DNA in a centrifuge.b. It is not destroyed by DNA-digesting enzymes.c. It migrates like DNA in an electric field.d. It is not destroyed by protein-digesting enzymes.
In another experiment, Griffith mixed heat killed S strain with live R strain bacteria and injected the mixture into mice. A. What strain of the bacteria was found in the blood samples of the mice? B. What were the results of this experiment? C. What conclusion did he reach based on these results?
a) what are restriction enzymes? b) What is the main function of restriction enzymes in nature? c) Compare and contrast the these enzymes in nature and in scientific research.
Arrange the following steps in the sequence they would happen in a DNA cloning experiment. a. sealing DNA fragments into vectors with DNA ligase; b. utilizing a probe to detect a clone in the library; c. sequencing the clone's DNA; d. creating a DNA library of clones; e. cutting genomic DNA with restriction enzymes. A. e,a,d,b,c B. a,d,b,c,e C. c,b,e,a,d D. e,d,a,c,b
What was the key discovery of the experiments of Avery, MacLeod, and McCarty? A. DNA degrading enzymes destroyed the ability of an extract to genetically transform bacteria. B. Lipid degrading enzymes destroyed the ability of an extract to genetically transform bacteria. C. Protein degrading enzymes destroyed the ability of an extract to genetically transform bacteria. D. RNA degrading enzymes destroyed the ability of an extract to genetically transform bacteria.
Which statement is true? a. There is no danger involved in recombinant DNA research in humans. b. Stringent safety rules make the use of recombinant DNA research impossible. c. There is no danger in releasing recombinant organisms into the environment. d. Stringent safety rules make the use of recombinant DNA research possible. e. There is no danger involved in recombinant DNA research in bacteria.
What is the enzymatic function of restriction enzymes? Group of answer choices a. to cut nucleic acids at specific sites b. to join nucleotides during transcription c. to add new nucleotides to the growing strand of DNA d. to repair breaks in sugar - phosphate backbones
What is a genetically modified organism (GMO)? a. a plant with certain genes removed b. an organism with an artificially altered genome c. a hybrid organism d. any agricultural organism produced by breeding or biotechnology
Using the data. Which genes have successful transduction？successful PCR？successful DNA sequencing？
frederic griffith used the word transformation to describe the changes in bacteria that he observed. which is the most useful definition of transformation?
Why is it important to use a hyperthermophilic DNA polymerase in PCR? a) Because only hyperthermophiles have DNA polymerases. b) Because hyperthermophilic DNA polymerase is able to resist the saline reaction conditions. c) Because hyperthermophilic DNA polymerase is faster than other polymerases. d) Because hyperthermophilic DNA polymerase is able to resist denaturation at 95℃.