Gene Regulation, Mutation & Biotechnology — Practice · Grade 10 Science

Chapter: DNA, Inheritance & Gene Expression

What this practice covers

By the end of Gene Regulation, Mutation & Biotechnology you should be able to:

8 questions, multiple choice and written answer, each with a worked explanation.

Vocabulary used: mutation, regulatory sequence, genetic engineering.

Problem 1

Which change can affect protein amount without changing coding sequence?
  1. Altered gene regulation
  2. A new species name
  3. A changed graph color
  4. Every cell losing water
Answer and explanation

Altered gene regulation

Expression controls can change RNA or protein levels.

Problem 2

Why is not every mutation inherited by an organism’s offspring?
Answer and explanation

A mutation may occur only in body cells and not enter the reproductive lineage.

Problem 3

Why should an engineered organism be compared with a suitable control?
Answer and explanation

Other genetic or environmental differences could explain its performance.

Problem 4

A liver cell increases transcription after a hormone signal without changing DNA sequence. Is this a mutation? Explain the reasoning in your own words.
Answer and explanation

No; it is regulation of expression in the supplied scenario.

The described change is in gene use.

A mutation would require a sequence change, which the prompt excludes.

Response criteria

  • Use the stated conditions.
  • Show the evidence or calculation.
  • Explain the conclusion and any stated limitation.

Problem 5

A DNA substitution has no amino-acid effect. Must it have no biological effect at all? Show the reasoning, not just the conclusion.
Hints

Expression amount and DNA sequence are different measurements.

Answer and explanation

No. It might affect regulation or RNA processing, though it can also be neutral; evaluate the specific evidence.

Problem 6

Why include untreated controls when testing a gene-editing intervention?
Hints

State what the supplied observations or conditions establish, and separate that from any assumption.

Answer and explanation

They help distinguish the intervention's effect from background variation and procedure effects.

Problem 7

Biotechnology requires evidence beyond achieving one molecular changeBiotechnology requires evidence beyond achieving one molecular changeSequence / designDefined targetDelivery + expressionFunction + monitoringA successful molecular step is not proof of a safe whole-system outcome.
Original biotechnology-evaluation chain, not laboratory operating instructions or a safety approval.
Interpret the supplied visual. Does detection of an intended edit establish its desired function and all downstream effects?
Answer and explanation

No. Expression, function, unintended effects and relevant system outcomes need independent evaluation.

Biotechnology uses biological processes or components for a defined purpose. Sequencing, selective breeding and molecular editing are different approaches with different mechanisms. A designed sequence must be delivered, expressed and evaluated in the relevant organism/context. Off-target effects are unintended changes or interactions beyond the desired target, and broader ecological or ethical questions require additional evidence and values. A classroom model should compare purpose, method, measured function and limitations; it is not a home genetic-modification protocol.

No. Expression, function, unintended effects and relevant system outcomes need independent evaluation.

Response criteria

  • Read the structures, axes, directions and units correctly.
  • Connect the evidence with the biological mechanism.
  • Respect stated model assumptions and distinguish an observation from a further inference.

Problem 8

A regulatory-region variant is associated with lower RNA but unchanged encoded amino-acid sequence. Explain a possible mechanism and two further tests needed for a causal trait claim.
Answer and explanation

It may reduce transcription or another regulatory process without changing the polypeptide sequence. Use matched genetic backgrounds/controls, protein amount/activity measurements and an appropriate trait test to examine causality and alternatives.

It may reduce transcription or another regulatory process without changing the polypeptide sequence. Use matched genetic backgrounds/controls, protein amount/activity measurements and an appropriate trait test to examine causality and alternatives.

Response criteria

  • Use the stated measurements or conditions, with correct units.
  • Connect the result to the biological mechanism or evidence relationship.
  • Identify the assumption, model limit or further evidence requested.

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