Watson and crick put those results together they

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Watson and Crick put those results together. They built models based on the findings that finally revealed DNA’s unique structure. Background Recall that a hydrogen bond is a weak attraction between a hydrogen atom and an oxygen, nitrogen, or fluorine atom. jw/£6Wx§›‹6_‹ Explain In a small group, discuss how you could determine the order of bases on one DNA strand if you knew the order of bases on the other strand. dggcaf_8[dgk]j8 9. Identify Which base always pairs with cytosine? W¤}“}wu¢4h|}/¡}/{ 10. Explain Why must an organism have the same amount of adenine as thymine?
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Copyright © by Holt, Rinehart and Winston. All rights reserved. Interactive Reader 135 DNA, RNA, and Proteins Name Class Date SECTION VOCABULARY DNA deoxyribonucleic acid, the material that contains the information that determines inherited characteristics gene the most basic physical unit of heredity; a segment of nucleic acids that codes for a functional unit of RNA and/or a protein nucleotide an organic compound that consists of a sugar, a phosphate, and a nitrogenous base; the basic building-block of a nucleic-acid chain purine a nitrogenous base that has a double-ring structure; one of the two general categories of nitrogenous bases found in DNA and RNA; either adenine or guanine pyrimidine a nitrogenous base that has a single- ring structure; one of the two general catego- ries of nitrogenous bases found in DNA and RNA; thymine, cytosine, or uracil 1. List Describe the results of three experiments that helped to show that DNA is the genetic material. 2. Describe What is the shape of a DNA molecule? 3. Apply Concepts Give the sequence of bases that is complementary to the sequence AATGCCGTATAG. 4. Explain How does the complementary pairing of bases allow both strands of a DNA molecule to contain the same information? 5. Describe Explain how the results of Chargaff’s experiment may have helped Watson and Crick determine the structure of DNA. Section 1 Review
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Copyright © by Holt, Rinehart and Winston. All rights reserved. Interactive Reader 136 DNA, RNA, and Proteins Name Class Date SECTION 2 Replication of DNA DNA, RNA, and Proteins CHAPTER 13 As you read this section, keep these questions in mind: How does DNA replicate, or make a copy of itself? What are the roles of proteins in DNA replication? How is DNA replication different in prokaryotes and eukaryotes? How Is DNA Copied? When cells divide, each new cell contains an exact copy of the DNA in the original cell. That happens because DNA consists of two strands of complementary base pairs. If the two strands are separated, each strand serves as a pattern to make a new complementary strand. So, a single DNA molecule can be used as a template , or pattern, to produce two identical DNA molecules. This process of DNA replication involves three steps.
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  • DNA, Holt, Rinehart

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