Gene Expression and Regulation

What is the name given to part of a DNA molecule that codes for a protein?

• Glucose

• Chromosome

• Gene

• Phosphate

Tags

NGSS.HS-LS1-1

In order for a gene to be expressed, ___ must bind to the gene's ___, a specific sequence of nucleotides at one end of the gene, thus initiating transcription.

• DNA polymerase, promotor

• DNA polymerase, operator

• RNA polymerase, promotor

• RNA polymerase, operator

Most gene regulation happens at which step along the way?

• translation

• transcription

• signal transduction

• DNA replication

What is the name of the stretch of DNA where RNA polymerase binds?

• operator

• promoter

• enhancer

• regulatory gene

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

• Operon

• Inducer

• Promoter

• Repressor

• Corepressor

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

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

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.

A process of turning genes on and off.

• gene mutation

• gene regulation

• gene process

• gene replication

What is the purpose of transcription?

• to create mRNA so that a specific protein can be coded for

• to aide the cell in creating cellular energy (ATP)

• to bind amino acids together to form a polypeptide

• to ensure that daughter cells have the same DNA as the mother cell