4/8/2018 2. What would occur if the repressor of an operorn were mutated so it c

Question

4/8/2018 2. What would occur if the repressor of an operorn were mutated so it could sot bind the eperator 2. Ifa particelar operon that encodes enzymes for making an essential amino acid and is regulated like the repressible Trp Operon, then . The amino acid inactivates the repressor b. The amino acid acts as a co-repressor and terns te the promoter b. Reduced transcription of the operons genes G. Contingous transcription of the operon's gemes d. None of the above off the operen. -. The amino acid turns on the transcription of the operon d. The represser is active in the absence of the amino acid None of the above 2. Which of the following statements is true about your DNA in one of your brain cells? 2. Some viruses can cause cancer A. Tree B. False a. Most of the DNA codes for proteins b. The majority of geroes will le transcribed c. It is the same as the DNA in a liver cell What are the two types of genes that when mutated can lead to tumor formatiom d. Each gene lies adjacent to an enhancer 1. After meiosis, a cell with 80 chromosomes at 2. Tetrads form during of a. Prophase, Mitosis b. Prophase II, Melosis c. Prophase I, Meiosis d. Prophase I, Mitosis . Nome of these are correct G1, will form daughter cells, with with chromosomes in each one. A. 2,80 B. 4, 80 C. 4, 40 D. 4, 20 E. 2, 40

Explanation / Answer

2) If a particular operon that encodes enzyme for making an essential amino acid and is regulated like the repressible Trp operon, then

Option b is the correct answer. The amino acid will act as a co-repressor and turns off the operon. The operom mentioned here is an example of repressible system in which the effector molecule interacts with the repressor protein such that it can bind to the operator. Thus, amino acid will act as an effector molecule and will suppress the transcription.

2) What would occur if the repressor of the operon were mutated so that it could not bind to the operator?

Option 'c' is the correct answer. Continuous transcription will take place. Mutation of repressor such that it cannot bind to operator will result in permanent switching on of operon which will lead to continuous transcription of the genes of the operon.

2) Which of the following statements is true about the DNA in one of your brain cells?

Option 'c' is the correct answer. It is the same as the DNA in a liver cell. All cells in an organism are derived from the mitotic division of the single celled zygote which is formed after fertilization of ovum by sperm. Thus, all the cell in a multicellular organism have the same genetic makeup, whether they be cells of brain or of liver. The difference in function and structure arises due to differential gene expression in cells of different region.

2) Some viruses can cause cancer.

True. The main viruses associated with human cancers are human papillomavirus, hepatitis B and hepatitis C virus, Epstein-Barr virus, human T-lymphotropic virus, Kaposi's sarcoma-associated herpesvirus (KSHV) and Merkel cell polyomavirus. These viruses are termed as oncoviruses.

What are the two types of genes that when mutated lead to tumor formation?

The two types of genes whose mutations can cause cancer are Proto-Oncogenes and Tumor-suprressor genes. When an oncogene is mutated, the cell continues to grow even though normally it wouldn't. Gain-of-Function Mutations Convert Proto-Oncogenes into Oncogenes. Loss-of-Function Mutations in Tumor-Suppressor Genes Are Oncogenic

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