Gene Regulation Quiz

What is gene regulation? What is its role in the cell?

• The process of DNA replication; it ensures genetic diversity.

• The control of gene expression; it determines which genes are active.

• The synthesis of proteins; it provides energy to the cell.

• The breakdown of glucose; it produces ATP.

The proteins produced in a liver cell are different from those produced in a neuron because:

• Liver cells and neurons have different DNA sequences.

• Liver cells and neurons are exposed to different environmental conditions.

• Different genes are expressed in liver cells and neurons.

• Liver cells and neurons have different numbers of chromosomes.

At what level does most eukaryotic regulation occur?

• Transcriptional level

• Translational level

• Post-translational level

• Replication level

How do cells “know” which genes to turn on and off?

• Through random selection

• By using gene regulatory proteins

• By the amount of sunlight exposure

• Through the process of mitosis

What is an operon?

• A segment of DNA that codes for a single protein

• A group of genes regulated together

• A type of RNA molecule

• A cellular organelle

The lac operon is a group of genes that regulates what?

• Glucose metabolism

• Lactose metabolism

• DNA synthesis

• Energy storage

Differentiate between a repressor and an inducer, describing the effect of each on the operon.

• Repressors activate the operon, while inducers deactivate it.

• Repressors deactivate the operon, while inducers activate it.

• Both repressors and inducers activate the operon.

• Both repressors and inducers deactivate the operon.

Describe why allolactose is considered an inducer.

• It binds to the repressor, allowing transcription.

• It binds to the DNA, blocking transcription.

• It deactivates the operon permanently.

• It has no effect on the operon.

How does the lac operon “know” when to turn on and off?

• It is always on.

• It responds to the presence of lactose.

• It is controlled by temperature changes.

• It is controlled by light exposure.

What is the role of the CAP inducer in the lac operon?

• It inhibits the operon.

• It enhances the operon's transcription.

• It has no role in the operon.

• It deactivates the operon.