Which describes a promoter?
  • mRNA is synthesized from a strand of DNA.
  • the first part of an operon that regulates where, when, and to what level a gene is expressed
  • protein
  • It cannot attach to the promoter
The molecule that brings amino acids to the ribosomes to be assembled into proteins is
  • CUAGUG
  • protein
  • translation
  • tRNA
The diagram shows one step in the process of protein synthesis.mc015-1.jpgWhat is the purpose of the peptide bond that is shown in the diagram?
  • It cannot attach to the promoter
  • tRNA
  • It connects amino acids
  • translation
Which is composed of amino acids and determines all the structures and functions of organisms?
  • translation
  • protein
  • CUAGUG
  • tRNA
Which nucleic acid moves the code for protein synthesis from the nucleus to the ribosomes?
  • protein
  • CUAGUG
  • tRNA
  • mRNA
Which occurs during transcription?
  • mRNA is synthesized from a strand of DNA.
  • the first part of an operon that regulates where, when, and to what level a gene is expressed
  • It cannot attach to the promoter
  • CUAGUG
During transcription, what happens to the RNA polymerase if a repressor protein attaches to the operator?
  • It cannot attach to the promoter
  • translation
  • It connects amino acids
  • mRNA is synthesized from a strand of DNA.
Only the proteins that the bacteria Escherichia coli (E. coli) needs are synthesized at any given time. For example, when lactose is available in the environment, E. coli will express the lac genes that allow it to break down lactose to obtain energy. When lactose is not present, these genes are not expressed.mc012-1.jpgWhich prevents the lac genes in the DNA of E. coli from being expressed most of the time?
  • It connects amino acids
  • the lac repressor
  • It cannot attach to the promoter
  • translation
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