The image provided illustrates the processes of
transcription and
translation, which are key steps in gene expression. Let's break down the diagram and solve the problem step by step.
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1. Understanding the Diagram
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Left Side: Transcription
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Nucleus: The DNA is located inside the nucleus.
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DNA (D): The double-stranded DNA molecule serves as the template for transcription.
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RNA Polymerase (E): This enzyme catalyzes the transcription process, synthesizing RNA from the DNA template.
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mRNA (X): The newly synthesized messenger RNA (mRNA) is transcribed from the DNA template strand. It carries the genetic information from the DNA to the ribosome for translation.
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Right Side: Translation
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Cytoplasm: The mRNA moves out of the nucleus into the cytoplasm.
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Ribosome (Y): The site where translation occurs. It reads the mRNA and synthesizes a protein.
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tRNA (F): Transfer RNA molecules bring specific amino acids to the ribosome based on the codons in the mRNA.
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Amino Acids (M): These are attached to tRNAs and are added to the growing polypeptide chain.
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Polypeptide Chain: The sequence of amino acids forms a protein.
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2. Identifying Components
Let’s identify the labeled components in the diagram:
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Left Side (Transcription)
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D: Double-stranded DNA.
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E: RNA polymerase enzyme.
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X: Messenger RNA (mRNA).
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Right Side (Translation)
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Y: Ribosome.
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F: Transfer RNA (tRNA).
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M: Amino acids.
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X: Messenger RNA (mRNA).
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3. Explanation of Processes
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Transcription
1.
Initiation: RNA polymerase binds to the DNA at a specific site called the promoter.
2.
Elongation: RNA polymerase unwinds the DNA double helix and synthesizes a complementary mRNA strand using one strand of DNA as a template.
3.
Termination: Transcription stops when RNA polymerase reaches a termination signal on the DNA.
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Translation
1.
Initiation: The mRNA binds to the ribosome, and the first tRNA carrying the start codon (usually methionine) enters the ribosome.
2.
Elongation: The ribosome reads the mRNA codons, and tRNAs bring corresponding amino acids to form peptide bonds between them.
3.
Termination: Translation stops when the ribosome encounters a stop codon on the mRNA.
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4. Final Answer
Based on the diagram and the processes described:
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X:
Messenger RNA (mRNA)
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Y:
Ribosome
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F:
Transfer RNA (tRNA)
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M:
Amino acids
Thus, the solution is:
\[
\boxed{X = \text{mRNA}, Y = \text{Ribosome}, F = \text{tRNA}, M = \text{Amino acids}}
\]
This completes the identification and explanation of the components involved in transcription and translation.
Parent Tip: Review the logic above to help your child master the concept of transcription and translation worksheet key.
