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Day 18: Check for Understanding Item Analysis TAKS Obj. 2 Bio 6b RNA

DNA mRNA Protein In nucleus On ribosome. Translation. Transcription. Day 18: Check for Understanding Item Analysis TAKS Obj. 2 Bio 6b RNA. The student knows the structures and functions of nucleic acids in the mechanisms of genetics. The student is expected to:

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Day 18: Check for Understanding Item Analysis TAKS Obj. 2 Bio 6b RNA

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  1. DNA mRNA Protein In nucleus On ribosome Translation Transcription Day 18: Check for Understanding Item Analysis TAKS Obj. 2 Bio 6b RNA • The student knows the structures and functions of nucleic acids in the mechanisms of genetics. The student is expected to: • (B)explain replication, transcription, and translation using models of DNA and ribonucleic acid (RNA);

  2. 1. Which of these represents the DNA segment from which this section of mRNA was transcribed? A ACTAAG B TCUTTG C GAAUCU D UCCTGA The correct answer is A. When RNA makes a copy of the DNA code (transcription), A matches with U and C matches with G.

  3. 2. The assembly of a messenger RNA strand that normally begins with UAC has been changed so that the newly assembled messenger RNA strand begins with UAG. Which of the following will most likely occur? A The protein will be missing the first amino acid. B The amino acids that make up the protein will all be different. C The mRNA will become attached to a ribosome. D The production of the protein will be stopped The correct answer is D. If UAC is mutated to UAG, instead of making the amino acid Tyrosine, a Stop Codon will stop the translation of the protein.

  4. 3. Coat color in mice varies greatly, ranging from black to grizzly gray, black-and-white, spotted, or white. The nucleus from a body cell of a grizzly-gray mouse is fused with an egg from a black mouse from which the nucleus has been removed. The egg begins to divide and is then transplanted into a female white mouse. What will be the most likely coat color of the offspring? A Black B Black with white spots C Grizzly gray D White The correct answer is C. In cloning, the offspring will have the characteristics of the donor nucleus since the DNA is carries there and it controls the cell.

  5. 4. Which cellular function does this model represent? A. Respiration B. Protein Synthesis C. DNA Replication D. Photosynthesis The correct answer is B, Protein Synthesis. This diagram shows the amino acids matching up the the mRNA at the ribosome.

  6. 5. The chain below the picture represents three codons. Which of the following changes would be expected in the amino acid chain if the mutation shown above occurred? A The amino acid sequence would be shorter than expected. B The identity of one amino acid would change. C The amino acid sequence would remain unchanged. D The identities of more than one amino acid would change. The correct answer is B. The amino acid would change from Arginine to Threonine.

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