1.08 Test Study Guide: Gene Expression

Which statement is most accurate?

• Hair is different from kidneys because their cells have different genes.

• As cells and tissues differentiate, they produce new genes.

• All cells have the same genes and all of a cell's genes are active at the same time.

• All cells have the same genes, but different genes are active in different cells.

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Cells in your hair produce the protein keratin, which is a primary component of hair. Cells in your liver do not produce keratin. Why does this specialization occur?

• Hair follicle cells contain different genes from liver cells.

• Hair follicle cells do not produce DNA.

• Different types of genes are activated in liver cells and hair follicle cells.

• Hair follicle cells contain recombinant DNA.

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Which diagram selection shows a system in which the lac operon genes are about to be transcribed?

• Diagram A because the repressor protein is ready to transcribe the genes.

• Diagram A because the repressor protein is no longer attached to the DNA segment.

• Diagram B because the repressor protein is ready to transcribe the genes.

• Diagram B because there is no lactose present.

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Which action must happen for transcription of the lac operon genes to take place?

• The repressor protein falls off the DNA molecule, and RNA polymerase binds to the promoter.

• The repressor protein binds to the DNA molecule, and RNA polymerase falls off.

• Lactose is removed from the system.

• The repressor protein binds to the promoter sequence.

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Which molecules in eukaryotic cells regulate gene expression?

• recombinant RNA

• replicatoin factors

• oxygen

• transcription factors

How would scientists go about constructing recombinant DNA molecules?

• by using RNA from plants

• by combining the DNA of two different organisms

• by combining the RNA of two different organisms

• by combining the proteins from two different organisms

Scientists involved in biotechnology sometimes insert the DNA of one organism into a second organism. What is the purpose of this process?

• to reverse the organism's gene expression

• to cause the second organisms to produce proteins

• to create different traits in the same species

• to make ATP

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How is the information in a DNA molecule expressed?

• through proteins

• through organelles

• through polymerase

• through new DNA

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Which phrase best explains the term gene expression?

• the suppression of RNA polymerase

• the production of lipids based on DNA

• the suppression of protein production

• the production of proteins based on the genetic information in DNA

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Why is the controlled timing of gene expression crucial to an organism?

• It allows for differentiation.

• It allows for specialization.

• It allows for development.

• All answer choices are correct.

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