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Could someone check my answers please? Lesson 14: Regulation of Gene Expression in Eukaryotes Really need help!

Biology
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1. A biologist discovers a new unicellular organism and isolates various components making up the organism. One component contains phosphate, uracil, adenine, ribose, guanine, and cytosine. Which of the following could be the identity of this component? (1 point)DNA repressor tRNA All of the above are correct. 2. Which of the following are necessary for transcription? (1 point)RNA polymerase, DNA, ribonucleotides DNA polymerase, RNA, deoxyribonucleotides RNA polymerase, DNA polymerase, DNA ribosome, tRNA, amino acids 3. What peptide would you expect to result from a 21-nucleotide-long DNA sequence that contains only the base adenine? Figure 13-3 (1 point)a peptide composed of 7 phe a peptide composed of 21 phe a peptide composed of 7 lys a peptide composed of 21 lys This item has been reviewed and is scheduled to be updated. All students will receive full credit for any response to the following. 4. After a strain of bacterial cells is exposed to a chemical mutagen, 30% of the cells produce new colonies that continue to grow. Which of the following can be concluded? (1 point)Some cells underwent beneficial mutations. Some cells underwent neutral mutations. Some cells underwent lethal mutations. All of the above are correct. This item has been reviewed and is scheduled to be updated. All students will receive full credit for any response to the following. 5. A DNA sequence reads -A-C-C-T-G-C-. Which of the following statements is plausible? (1 point)Mutation to -A-C-G-T-G-C- is a neutral mutation. Mutation to -A-A-G-T-G-C- is a frameshift mutation. Mutation to -A-C-C-T-G-T- is an advantageous mutation. Mutation to -A-A-G-T-G-C- is a lethal mutation. 6. Tryptophan is an amino acid that is synthesized via a series of metabolic reactions. The genes for the enzymes involved in tryptophan biosynthesis are encoded in an operon in E. coli, a prokaryote. The operon is regulated by a repressor, which changes its shape when tryptophan binds to it. Which of the following statements explains the action of the repressor? (1 point)When tryptophan levels are high, it binds to the repressor, changing its shape so that it cannot bind to the operator region. When tryptophan levels are low, it binds to the repressor, changing its shape so that it cannot bind to the operator region. When tryptophan levels are high, it binds to the repressor, changing its shape so that it can bind to the operator region. When tryptophan levels are low, it binds to the repressor, changing its shape so that it can bind to the operator region. 7. Mutation of which of the following would result in the least disruption during development of a frog embryo? (1 point)ribosomal protein gene RNA polymerase gene homeotic genes melanin gene 8. Which of the following do all cells in a multicellular organism have in common? (1 point)They all express the same genes.

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d.a.c.d.c.b.c.d.
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they are all right
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