Central Dogma: From DNA to Protein

Q6. Label the gene, DNA, RNA, amino acids, and protein on the figure below. Next, label the three steps in the process and describe each.

Background

Topic: The Central Dogma of Molecular Biology

This question is about the flow of genetic information in cells, specifically how information in DNA is used to make proteins. This process involves three main steps: transcription, RNA processing (in eukaryotes), and translation.

Key Terms and Concepts:

• Gene: A segment of DNA that contains instructions for making a specific protein.

• DNA (Deoxyribonucleic Acid): The molecule that stores genetic information.

• RNA (Ribonucleic Acid): A single-stranded molecule transcribed from DNA; acts as a messenger carrying instructions from DNA for protein synthesis.

• Amino Acids: The building blocks of proteins.

• Protein: A molecule composed of one or more long chains of amino acids; performs a variety of functions in the cell.

Key Steps (with Formulas):

1. Transcription: The process by which a gene's DNA sequence is copied to make an RNA molecule. $\text{DNA} \xrightarrow{\text{transcription}} \text{RNA}$

2. RNA Processing (in eukaryotes): The RNA transcript (pre-mRNA) is modified to become mature mRNA. $\text{pre-mRNA} \xrightarrow{\text{processing}} \text{mRNA}$

3. Translation: The mRNA sequence is used as a template to assemble amino acids into a polypeptide (protein). $\text{mRNA} \xrightarrow{\text{translation}} \text{Protein}$

Step-by-Step Guidance

1. Identify the top structure as DNA (double helix) and label the gene as a specific region on this DNA.

2. Label the next structure as RNA, which is synthesized from the DNA template during transcription.

3. Label the single units attached to the RNA as amino acids, which are the building blocks of proteins.

4. Label the final structure as a protein (polypeptide), which is formed by linking amino acids in a specific sequence.

5. For each arrow between the structures, write the name of the process (transcription, RNA processing, translation) and briefly describe what happens in each step.

Try solving on your own before revealing the answer!

Final Answer:

DNA (top) contains the gene. The first arrow is transcription, producing RNA (second structure). The next arrow is RNA processing (in eukaryotes), resulting in mature mRNA (third structure). The third arrow is translation, where amino acids (shapes) are assembled into a protein (bottom structure). The steps are: 1) Transcription, 2) RNA processing, 3) Translation.