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5150mx Group Title

PLEASE HELP I NEED SOMEONE TO POST THE ANSWERS I'M VERY BEHIND -- If a mutation occurs in the gene for the lac repressor and results in a repressor that does not bind lactose, which of the following will be observed? (1 point) The mutant will not be able to grow on lactose. The mutant will only be able to grow on lactose. The mutant will be able to grow on lactose and on other sugars. The mutant will be harmed by the presence of lactose. Which of the following frameshift mutations might be expected to have the least impact on an organism?

  • one year ago
  • one year ago

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  1. 5150mx Group Title
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    Which of the following frameshift mutations might be expected to have the least impact on an organism? (1 point) a deletion of two nucleotides near the beginning of a gene an insertion of three nucleotides in the middle of a gene a deletion of four nucleotides near the end of a gene an insertion of five nucleotides at a gene’s promoter site

    • one year ago
  2. yukitou Group Title
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    For first question: The mutant will not be able to grow on lactose. In a normal lac operon, mRNA is transcribed from lacI gene (which is a lac repressor gene) to make repressor protein to bind on lac gene operator. When the lac repressor protein binds on the lac gene operator, RNA polymerase cannot bind on the gene to start transcription to make enzyme to break down lactose. If there is lactose around, allolactose ( a metabolite of lactose) will bind on the lac repressor, causing the repressor to change shape and no longer bind on the gene. Now the RNA polymerase can bind on the gene to make enzyme. If the mutant repressor cannot bind with lactose, this means the repressor won't change shape to leave the gene operator, so it still binds on the gene operator. At the end, there is no transcription and no enzyme is made to break down lactose.

    • one year ago
  3. yukitou Group Title
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    For second question, an insertion of three nucleotides in the middle of a gene One codon has 3 bases. If you insert or delete one codon (triplet bases), the start codon and stop codon is still not affected. If you insert or delete any number of bases other than the multiples of 3, the stop codon is affected and you might end up losing the stop codon. I hope this helps. Correct me if i am wrong.

    • one year ago
  4. FlaCaLOL Group Title
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    unit n lesson?

    • one year ago
  5. Goblin99 Group Title
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    Unit4 Lesson19 Unit 4 Genetics Practice 1. How many different phenotypes are possible in the offspring of two parents with genotypes AA and aa, where A is the dominant allele for a trait and a is the recessive allele for the same trait? (1 point) (1 pt) one (0 pts) two (0 pts) three (0 pts) four 1 /1 point 2. A woman buys red-flowering and blue-flowering plants of the same species and plants them in her garden. The plant undergoes both self-fertilization and cross-fertilization. The woman collects seeds and plants them the following spring. What can the woman expect to observe in the flowers of the new generation of plants if the gene for flower color is codominant? (1 point (0 pts)plants with red flowers and plants with blue flowers (0 pts) plants with both red and blue flowers (1 pt) plants with red flowers, plants with blue flowers, and plants with purple flowers (0 pts) plants with purple flowers 1 /1 point 3. What is formed at the end of meiosis? (1 point (0 pts) two genetically identical cells (1 pt) four genetically different cells (0 pts) four genetically identical cells (0 pts) two genetically different cells 0 /1 point 4. Which of the following is true concerning DNA replication? (1 point) (0 pts) The original DNA molecule remains intact, although it acts as a template for the formation of a copy that contains two new antiparallel strands (0 pts) The leading strand is copied in the 5’ to 3’ direction and the lagging strand is copied in the 3’ to 5’ (0 pts) Both strands are copied to form Okazaki fragments, which are later annealed by DNA ligase (1 pt) The replication process proceeds on both strands in the same direction, which requires that RNA primers bind to the lagging strand 0/1 point 5. Which of the following will be directly affected in a bacterial cell that has a mutation in its gene for RNA polymerase? (1 point (0 pts) DNA replication (1 pt) transcription (0 pts) translation (0 pts) gene regulation 1 /1 point 6. Which of the following DNA sequences will result in the amino acid sequence –pro-phe-tyr?(1 point) (1 pt)GGGAAAATG (0 pts) CCCUUUUAC (0 pts) GGGUUUUAG (0 pts) CCCTTTTTC 1 /1 point 7. Which of the following frameshift mutations might be expected to have the least impact on an organism? (1 point (0 pts) a deletion of two nucleotides near the beginning of a gene (1 pt) an insertion of three nucleotides in the middle of a gene (0 pts) a deletion of four nucleotides near the end of a gene (0 pts) an insertion of five nucleotides at a gene’s promoter 1 /1 point 8. If a mutation occurs in the gene for the lac repressor and results in a repressor that does not bind lactose, which of the following will be observed? (1 point) (1 pt) The mutant will not be able to grow on lactose. (0 pts) The mutant will only be able to grow on lactose. (0 pts)The mutant will be able to grow on lactose and on other sugars. (0 pts) The mutant will be harmed by the presence of lactose. 1/1 point 9. If a man with blood type A and a woman with blood type B produce an offspring, what might be the offspring’s blood (1 point (0 pts) AB or O (0 pts) A, B, or O (1 pt) A, B, AB, or O (0 pts) AB only 1/1 point 10. Which of the following would require the use of recombinant DNA? (1 point) (0 pts) crossing two apple trees to create better apples (0 pts) breeding a donkey and a horse to make a mule (1 pt) engineering bacteria that produce human insulin (0 pts) creating a polyploid banana tree 1 /1 point Responses saved. The final score is 8/10 (80%)

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