Biology (MindTap Course List)
Biology (MindTap Course List)
10th Edition
ISBN: 9781285423586
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 13, Problem 15TYU

Biologists hypothesize that transposons eventually lose the ability to replicate and therefore remain embedded in DNA without moving around. Based on what you have learned in this chapter, suggest a possible reason for this loss.

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Please read the scenario below and then answer the question (in bold) that follows. An original DNA sequence reads 3'- GGCGCTAGAATC -5'. A mutated version of that DNA strand is produced that reads 3-GGCTCTAGAATC -5. Based on the information above, how severe of an impact do you believe the mutation would have on the cell (and therefore individual) in which the mutation occurred? O a. Very severe, because the mutation leads to the formation of a truncated polypeptide O b. Moderately to very severe, because the mutation results in the formation of a polypeptide that contains amino acids not found in the unmutated polypeptide O c. Likely not that severe, because the amino acid sequence of the mutated polypeptide is identical to the amino acid sequence of the nonmutated polypeptide
Researchers can isolate a sample of cells, such as skin fibroblasts, and grow them in the laboratory. This procedure is called a cell culture. A cell culture can be exposed to a sample of DNA. If the cells are treated with agents that make their membranes permeable to DNA, the cells may take up the DNA and incorporate it into their chromosomes. This process is called transformation or transfection. Scientists have transformed human skin fibroblasts with methylated DNA and then allowed the fibroblasts to divide for several cellular generations. The DNA in the daughter cells was then isolated, and the segment that corresponded to the transformed DNA was examined. This DNA segment in the daughter cells was also found to be methylated. However, if the original skin fibroblasts were transformed with unmethylated DNA, the DNA found in the daughter cells was also unmethylated. With regard to the transformed DNA, do fibroblasts perform de novo methylation, maintenance methylation, or both?…
Researchers are designing several experiments to test the ability of Salmonella bacteria to develop antibiotic resistance. A culture of Salmonella bacteria is exposed to the same concentrations (200 mg/L) of an antibiotic for four days. The table shows the number of isolated resistant bacteria over a four-day period. Which of the following statements best explains these results? A - The bacteria were not affected by the antibiotic. B - After being exposed to the antibiotic, the bacteria altered their DNA. C - A new species of bacteria emerged after the antibiotics were introduced. D - Random mutations led some bacteria to be resistant and, over time, they increased in the population.

Chapter 13 Solutions

Biology (MindTap Course List)

Ch. 13.3 - Compare bacterial and eukaryotic mRNAs, and...Ch. 13.3 - In what ways are DNA polymerase and RNA polymerase...Ch. 13.3 - A certain template DNA strand has the following...Ch. 13.3 - What features do mature eukaryotic mRNA molecules...Ch. 13.4 - Identify the features of tRNA that are important...Ch. 13.4 - Explain how ribosomes function in polypeptide...Ch. 13.4 - Prob. 10LOCh. 13.4 - Prob. 11LOCh. 13.4 - What are ribosomes made of? Do ribosomes carry...Ch. 13.4 - What happens in each stage of polypeptide...Ch. 13.4 - A certain mRNA strand has the following nucleotide...Ch. 13.5 - Give examples of the different classes of...Ch. 13.5 - What are the main types of mutations?Ch. 13.5 - Prob. 2CCh. 13.6 - Briefly discuss RNA interference.Ch. 13.6 - Prob. 14LOCh. 13.6 - Prob. 15LOCh. 13.6 - Prob. 1CCh. 13.6 - Prob. 2CCh. 13.6 - Prob. 3CCh. 13 - Prob. 1TYUCh. 13 - What is the correct order of information flow in...Ch. 13 - During transcription, how many RNA nucleotide...Ch. 13 - The genetic code is defined as a series of...Ch. 13 - RNA differs from DNA in that the base...Ch. 13 - Prob. 6TYUCh. 13 - Which of the following is/are not found in a...Ch. 13 - Which of the following is/are typically removed...Ch. 13 - Prob. 9TYUCh. 13 - Suppose you mix the following components of...Ch. 13 - Prob. 11TYUCh. 13 - Prob. 12TYUCh. 13 - Compare and contrast the formation of mRNA in...Ch. 13 - Explain to a friend the experimental strategy that...Ch. 13 - Biologists hypothesize that transposons eventually...Ch. 13 - Prob. 16TYUCh. 13 - Prob. 17TYUCh. 13 - Prob. 18TYU
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