AP Bio Operon Quiz

T/F The genetic code is different in nearly all organisms.

• True

• False

T/F Cells regulate gene expression so that each gene will be transcribed only when it is needed.

• True

• False

T/F Gene expression is prevented when a repressor binds to the group of genes involved in the same function.

• True

• False

T/F When repressor proteins are bound to the DNA in front of each gene, it readily allows transcription to take place as the RNA polymerase moves along that gene.

• True

• False

During transcription, the genetic information for making a protein is "rewritten" as a molecule of

• messenger RNA

• ribosomal RNA

• transfer RNA

• mitochondrial RNA

In bacteria, a group of genes that code for functionally related enzymes, their promoter site, and the operator that controls them all function together as a(n)

• exon

• intron

• operon

• ribosome

The function of the operator is to

• regulate access of RNA polymerase to specific genes

• turn on and off the molecules of tRNA

• control the process of transcription within the nucleus

• generate amino acids for protein synthesis

Cells must control gene expression so that

• their genes will be expressed only when needed

• their genes will always be expressed

• their genes will never be expressed

• genetic disorders can be corrected

Tags

NGSS.HS-LS1-1

A repressor protein

• prevents DNA synthesis

• attaches to ribosomes during translation

• destroys amino acids before protein synthesis occurs

• blocks movement of RNA polymerase

The presence of a repressor protein prevents the action of what enzyme?

• DNA polymerase

• RNA polymerase

• lactase

• permease