____ 12. The table in Figure 12–3 shows the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the the table. Based on Chargaff’s rule, percentages of guanine bases in chicken DNA should be around a. 28.8% b. 19.9% c. 21.5% d. 13.4% ____ 13. the percentage of cytosine in the DNA of the bacterium, in Figure 12–3, S. Lutea Based on Chargaff’s rule, should be around a. 26.6%. b. 73.2%. c. 36.6%. d. 29.4%. ____ 14. DNA makes a good molecule for storing information because a. its bases can be joined together in any order, like the letters of the alphabet can be strung to form different words. b. each nucleotide within a DNA strand can give a cell different information, and there are many nucleotides in every cell. c. it can absorb ultraviolet light, so DNA can help protect cells from the damaging effects of this form of radiation. d. it is a type of nucleic acid, and most acids are an important part of information storage within cells. ____ 15. Which of the following best to our understanding of the structure describes Rosalind Franklin’s contribution of DNA? a. She created many models of DNA based on what was known about its properties, and eventually figured out that the structure of DNA is a double helix. b. She purified large amounts of DNA, stretched the fibers so the strands were parallel, and used an X-ray beam to produce an image of the molecule. c. She isolated DNA from many different organisms, and discovered that in every sample, the amount of guanine was almost exactly equal to the amount of cytosine. d. She used radioactive phosphorus and sulfur to produce radioactive viruses, then allowed these viruses to infect bacteria. She found that DNA was the transforming material. ____ 16. Which scientist(s) figured out that the shape of a DNA molecule is a double helix? a. Hershey and Chase b. Griffith c. Watson and Crick d. Franklin
____ 12. The table in Figure 12–3 shows the results of measuring the percentages of the four bases in the DNA of several different organisms. Some of the values are missing from the table. Based on Chargaff’s rule, the percentages of guanine bases in chicken DNA should be around a. 28.8% b. 19.9% c. 21.5% d. 13.4% ____ 13. Based on Chargaff’s rule, the percentage of cytosine in the DNA of the bacterium, S. Lutea in Figure 12–3, should be around a. 26.6%. b. 73.2%. c. 36.6%. d. 29.4%. ____ 14. DNA makes a good molecule for storing information because a. its bases can be joined together in any order, like the letters of the alphabet can be strung to form different words. b. each nucleotide within a DNA strand can give a cell different information, and there are many nucleotides in every cell. c. it can absorb ultraviolet light, so DNA can help protect cells from the damaging effects of this form of radiation. d. it is a type of nucleic acid, and most acids are an important part of information storage within cells. ____ 15. Which of the following best describes Rosalind Franklin’s contribution to our understanding of the structure of DNA? a. She created many models of DNA based on what was known about its properties, and eventually figured out that the structure of DNA is a double helix. b. She purified large amounts of DNA, stretched the fibers so the strands were parallel, and used an X-ray beam to produce an image of the molecule. c. She isolated DNA from many different organisms, and discovered that in every sample, the amount of guanine was almost exactly equal to the amount of cytosine. d. She used radioactive phosphorus and sulfur to produce radioactive viruses, then allowed these viruses to infect bacteria. She found that DNA was the transforming material. ____ 16. Which scientist(s) figured out that the shape of a DNA molecule is a double helix? a. Hershey and Chase b. Griffith c. Watson and Crick d. Franklin
8.14%20DNAReplicationTest.docx