Gene Expression and Protein Synthesis

Why do different cells in the human body, like eye cells and stomach cells, produce different substances even though they contain the same DNA?

• They have different sets of genes.

• Gene regulation controls which genes are active in each cell type.

• Stomach cells have more DNA than eye cells.

• Eye cells destroy unnecessary genes.

What is the primary function of DNA in the process of protein synthesis?

• To act as an enzyme that speeds up reactions.

• To transport proteins to different parts of the cell.

• To provide the instructions for building proteins.

• To break down complex molecules into simpler ones.

Which enzyme is responsible for building messenger RNA (mRNA) from a DNA template during transcription?

• DNA Polymerase

• RNA Polymerase

• Lactase

• Repressor

In the Lac Operon, what happens when there is no lactose present in the environment?

• Lactose binds to the repressor, allowing gene expression.

• The repressor binds to the operator, preventing RNA Polymerase from transcribing the genes.

• RNA Polymerase directly binds to the genes and starts making enzymes.

• The promoter region is removed, stopping all gene activity.