CH15_Answers

CH15_Answers - Raven/Johnson Biology 8e Chapter 15 Answers...

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Raven/Johnson Biology 8e Chapter 15 Answers 1. The experiments with nutritional mutants in Neurospora by Beadle and Tatum provided evidence that— a. bread mold can be grown in a lab on minimal media b. X-rays can damage DNA c. cells need enzymes d. genes specify enzymes The correct answer is d— A. Answer a is incorrect. The ability of mold to grow on bread was not a new observation. Beadle and Tatum’s research provided new insights into the relationship between genes and proteins. The correct answer is d— B. Answer b is incorrect. The ability of X-rays to damage DNA was already known. Beadle and Tatum used this fact when they generated nutritional mutants. The correct answer is d— C. Answer c is incorrect. The function of enzymes in cell metabolism was already known. Beadle and Tatum used existing knowledge about the biochemical pathway of arginine synthesis in their experiment. The correct answer is d—genes specify enzymes D. Answer d is correct. The concept of one-gene/one-polypeptide was based on the results of Beadle and Tatum’s experiments. 2. What is the central dogma of molecular biology? a. DNA is the genetic material b. Information passes from DNA to protein c. Information passes from DNA to RNA to protein d. One gene encodes only one polypeptide The correct answer is c— A. Answer a is incorrect. The central dogma refers to the direction of information flow in a cell. DNA is the genetic material; however, this does not explain the relationship between DNA and protein. The correct answer is c— B. Answer b is incorrect. The information encoded in the DNA is converted to protein; however, there is an intermediate step in the flow of information that requires a molecule of RNA. The correct answer is c—Information passes from DNA to RNA to protein C. Answer c is correct. The flow of information in a cell moves from DNA to protein by way of RNA. The correct answer is c— D. Answer d is incorrect. The central dogma refers to the direction of information flow in a cell, not to the relationship between genes and proteins.
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Raven/Johnson Biology 8e Chapter 15 Answers 3. The manufacture of new proteins is termed ___________, and the production of a messenger RNA corresponding to a specific gene is called ___________. a. translation; transcription b. termination; translation c. transcription; translation d. transfer; translation The correct answer is a—translation; transcription A. Answer a is correct. Protein synthesis involves the translation (RNA and protein are different molecular types) of the genetic code in a messenger RNA into the amino acid sequence of a protein. In contrast, the information in a molecule of DNA is transcribed (DNA and RNA are the same molecular type) into a molecule of messenger RNA. The correct answer is a—
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This note was uploaded on 06/07/2009 for the course BIO 5 taught by Professor Martins-green during the Spring '09 term at UC Riverside.

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CH15_Answers - Raven/Johnson Biology 8e Chapter 15 Answers...

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