Gene Expression and Regulation

Genes can be shut off (not expressed) when a ___ binds to the ____.

• activator, operator

• repressor, operator

• corepressor, operator

• repressor, promotor

In the lac operon model the genes within the operon will be expressed if:

• lactose is absent in the cell

• glucose is present in the cell

• lactose is present in the cell

If an mRNA molecule has introns and exons in it, where is it?

• At a ribosome

• In the nucleus

• In a prokaryotic cell

• could be in the nucleus or the ribosome

What structure of this molecule binds with the mRNA molecule?

• Amino Acid

• tRNA

• Anticodon

• Codon

RNA has what base that is instead of thymine?

• guanine

• adenine

• thymine

• uracil

How would the DNA sequence GCTATA be transcribed to mRNA?

• GCUAUA

• CGATAT

• CGAUAU

• GCUTUT

What is Transcription?

• The making DNA segment.from mRNA.

• The making of an RNA strand into a protein.

• The making of an mRNA strand from the DNA template.

Which RNA type is the result of transcription?

• tRNA

• Non-coding RNA

• rRNA

• mRNA

Which of the following is correct?

• Nucleotide triplets code a single amino acid.

• Each amino acid codes a nucleotide.

• Each nucleotide codes an amino acid.

• Amino acid triplets code a single nucleotide.

Tags

NGSS.HS-LS1-1

Translation is a process where:

• a polypeptide sequence is produced from a sequence of rRNA codons.

• a polypeptide sequence is produced from a sequence of tRNA codons.

• a polypeptide sequence is produced from a sequence of mRNA codons.

• a DNA nucleotide sequence is used to produce mRNA codon sequence.