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- Rauolfia serpentine, to save this plant under the threat of extinction, which of the following techniques is useful?a) Genetic engineeringb) In vitro culturec) DNA fingerprintingd) Hybridoma technologyCertain strains of bacteria that were killed by the antibiotic penicillin in the past are now resistant. The probable explanation for this is that the reproductive rate must have increased naturally. a mutation for resistance occurred that was passed on to succeeding generations because it had high survival value. the strains have become resistant because they needed to do so for survival. individual bacteria gradually became tolerant to increasing levels of penicillin over some time.As evolution is the change in allele frequency in a population over time … Explain the evolution of bacteria in terms of changes to the frequency of the NDM-1 gene.
- The discovery of HIV virus was a race between two groups of scientists. Do you think the scientistic research should be a “race”? What are the pros and cons of such a race?A Cure for Beriberi In 1887, a strange nerve disease attacked the people in the Dutch East Indies. The disease was beriberi. Symptoms of the disease included weakness and loss of appetite. Victims often died of heart failure. Scientists thought the disease might be caused by bacteria. They injected chickens with bacteria from the blood patients with beriberi. The injected chickens became sick. However, those groups of chickens that were not injected with bacteria also became sick.One of the scientists, Dr. Eijkman, noticed something. Before the experiment, all chickens had eaten whole grain rice, but during the experiment, the chickens were fed polished rice. Dr. Eijkman researched this interesting case. He found that polished rice lack thiamine, a vitamin necessary for good health. Questions:1. What was the observation?2. What was the hypothesis?3. How was the hypothesis tested?4. What was the result of the experiment?5. What conclusion could be drawn?6. Which of…New alleles in bacteria can arise by All of the answers are correct. conjugation transduction transformation mutation
- In a single point mutation, when the RNA changes but not the amino acid, it is called Why do scientisits create GMOS5) Below is an image that shows both reproductive and therapeutic cloning. Use this image to answer compare and contrast therapeutic and reproductive cloning. Are they used for similar means…etc. Once you have done that answer the question below. a) There are two types of therapeutic cloning. What are they and how are they different?DNA _____. a. guides form and function b. is the basis of traits c. is transmitted from parents to offspring d. all of the above
- A new beneficial mutation arises in a population of bacteria (haploid microbe) with a population size of 100,000. Individuals without the mutation have a 1% reduction in survival relative to individuals with the mutation. How many generations do you expect it take for the allele to reach fixation?The bacteria in figure 1.8 reproduce asexually, yet they areevolving. What is their source of genetic variation?In 1887 a strange nerve disease attacked the people in the Dutch East Indies. The disease was beriberi. Symptoms of the disease included weakness and loss of appetite, victims often died of heart failure. Scientists thought the disease might be caused by bacteria. They injected chickens with bacteria from the blood of patients with beriberi. The injected chickens became sick. However, so did a group of chickens that were not injected with bacteria. One of the scientists, Dr. Eijkman, designed a new experiment based on his own observations. Before the experiment, all the chickens had eaten whole-grain rice, but during the experiment, the chickens were fed polished rice. Dr. Eijkman researched this interesting case and found that polished rice lacked thiamine, a vitamin necessary for good health. How would Dr. Eijkman test his new hypothesis?
