Gene Expression

A lack of this nonprotein molecule would result in the inability of the cell to "turn off" genes:

• Operon

• Inducer

• Promoter

• Repressor

• Corepressor

The lactose operon is likely to be transcribed when

• there is more glucose in the cell than lactose.

• the cyclic AMP levels are low.

• there is glucose but no lactose in the cell.

• the cyclic AMP and lactose levels are both high within the cell.

• the cAMP level is high and the lactose level is low.

Muscle cells differ from nerve cells mainly because they

• express different genes.

• contain different genes.

• use different genetic codes.

• have unique ribosomes

Tags

NGSS.HS-LS1-1

A type of control element that acts with transcription factors to promote initiation may be perceived as a distal control element. This control element is called a(n):

Which of the following processes is part of gene expression?

• DNA replication

• Transcription

• DNA repair

• DNA methylation

In the context of gene expression, what is the function of mRNA?

• To carry genetic information from DNA to the ribosome

• To form the structure of ribosomes

• To transport amino acids to the ribosome

• To catalyse peptide bond formation

Imagine Jackson, Harper, and William are in a science quiz competition. The quizmaster asks, 'Which process and product are represented in Diagram 2?' Can you help them answer?

• Process: Transcription

  Product: mRNA

• Process: Translation

  Product: protein

• Process: Replication

  Product: tRNA

• Process: Recombination

  Product: polymerase

Answer explanation

The question asked about the process and product represented in a given diagram. The correct answer is 'Process: Transcription, Product: mRNA'. This indicates that the diagram was illustrating the process of transcription, where a segment of DNA is copied into mRNA. This mRNA then serves as a template for protein synthesis. The other options, including translation, replication, and recombination, are not correct in this context.

Tags

NGSS.HS-LS1-1

Transcription and translation are important processes involved in gene expression. Which of the following is true about the products produced by these processes?

• Transcription produces DNA molecules, whereas translation produces proteins.

• Transcription produces RNA molecules, whereas translation produces proteins.

• Transcription produces proteins, whereas translation produces RNA molecules.

• Transcription produces RNA molecules, whereas translation produces DNA molecules.

The initial steps in gene expression are modeled. Double-stranded DNA first unwinds into two strands. Which process and product are represented in the diagrams?

• Process: transcription; product: mRNA

• Process: translation; product: protein

• Process: replication; product: tRNA

• Process: recombination; product: polymerase

Tags

NGSS.HS-LS1-1

When a gene is activated _________ binds to the DNA at the start of the gene and moves along the DNA to create mRNA

• keritanase

• RNA polymerase

• TAQ polymerase

• catalyase