Trace information flow

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: DNA is unchanged, but a model cell makes more RNA from one gene. Explain the process difference.
• Assessment case 1: A cell copies DNA to DNA before division while another makes RNA from DNA. What differs? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: RNA copy made from gene.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Ribosome builds amino-acid chain.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Cell changes how much RNA is produced.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: DNA template produces RNA.
• Assessment case 6: RNA codons guide a ribosome while the DNA template stays unchanged. What is supported? Which inference or prediction is best supported?

Learn the idea

A common protein-coding pathway transcribes DNA into RNA and translates RNA into an amino-acid sequence. Not every gene encodes a protein. Regulation determines when and how much expression occurs.

Replication means DNA copied into DNA. Transcription means RNA produced from DNA template. Translation means RNA information used to build protein. Regulation means control of expression timing or amount.

For the supplied mechanism problem, DNA is unchanged, but a model cell makes more RNA from one gene. Explain the process difference. Expression regulation changes the amount transcribed without requiring a DNA mutation. RNA then may support changed protein production. Not every gene necessarily codes for a protein.

1. Read the supplied problem and mark the structures, processes or quantities named: DNA is unchanged, but a model cell makes more RNA from one gene. Explain the process difference.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

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Take it further

New case: DNA remains unchanged while less RNA is transcribed. Expected: altered expression regulation, not demonstrated DNA mutation; protein production may change depending on the pathway.

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