1. what would happen to the protein sequence if the first dna triplet tac was mutated to tag?a) the mrna codon would become auc and code for isoleucine.b) the mrna codon would become auc and transcription would stop immediately.c) the mrna codon would become uag and the protein would not start assembling (no start codon).d) the protein would be exactly the same because of genetic redundancy.part 5: scientific reasoning (cer)scenario: a starfish can regrow a lost limb. scientists want to understand how this process occurs at the cellular level.prompt: use the sentence starters below to explain how the cell cycle and protein synthesis allow for limb regrowth. provide specific evidence for both cell division and the production of biological molecules.claim: the cell cycle and protein synthesis allow the starfish to regrow its limb because...evidence (mitosis): mitosis contributes to regrowth by...evidence (protein synthesis): dna and ribosomes contribute to regrowth by...reasoning: these biological processes work together to restore the limb because...

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Accepted Answer

### First Question (Multiple Choice)
# Brief Explanations:
1.  Transcribe DNA to mRNA: DNA 'TAC' pairs with mRNA 'AUG' (start codon); mutated DNA 'TAG' pairs with mRNA 'UAG' (stop codon).
2.  Analyze options:
    - a) Incorrect: mRNA codon is UAG, not AUC.
    - b) Incorrect: mRNA codon is UAG, and stop codons act during translation, not transcription.
    - c) Correct: Mutated DNA makes mRNA UAG, a stop codon that halts protein assembly before it starts (since the original was a start codon).
    - d) Incorrect: The mutation changes a start codon to a stop codon, so the protein is not made at all, not the same.
# Answer:
c) The mRNA codon would become UAG and the protein would not start assembling (no Start codon).

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### Second Question (CER Prompt)
# Brief Explanations:
- **Claim**: Ties the cell cycle (mitosis) and protein synthesis directly to the production of new cells and structures needed for limb regrowth.
- **Evidence (Mitosis)**: Focuses on how mitosis generates genetically identical cells to replace and build the new limb tissue.
- **Evidence (Protein Synthesis)**: Links DNA (genetic instructions) and ribosomes (protein production) to making the specialized proteins required for limb structure and function.
- **Reasoning**: Connects the two processes: mitosis provides the cells, and protein synthesis provides the molecular components for those cells to form a functional limb.
# Answer:
Claim: The cell cycle and protein synthesis allow the starfish to regrow its limb because they generate new, specialized cells and the molecules needed to build and maintain limb tissue.
Evidence (Mitosis): Mitosis contributes to regrowth by producing genetically identical diploid cells that form the new muscle, nerve, and connective tissue of the limb.
Evidence (Protein Synthesis): DNA and ribosomes contribute to regrowth by using DNA's genetic code to transcribe mRNA, which ribosomes translate into structural proteins (like collagen for connective tissue) and regulatory proteins that guide limb development.
Reasoning: These biological processes work together to restore the limb because mitosis increases the number of cells in the regrowing area, while protein synthesis provides the specific proteins those cells need to differentiate into the correct cell types and form the functional structures of a complete starfish limb.

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Explanation:

First Question (Multiple Choice)

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Second Question (CER Prompt)