guide ribosomal subunits out of the nucleus through nuclear pores

deliver amino acids to their proper site during protein synthesis

process mRNA

attach mRNA to the small subunit of the ribosome

when an mRNA codon paired with a tRNA anticodon

in a double-stranded DNA molecule

during transcription

during translation

In eukaryotic cells, transcribed RNA sequences function as termination signals.

In prokaryotes, proteins are assembled directly from DNA.

RNA polymerases are involved only in initiation of transcription in eukaryotes.

Different systems of DNA unpacking could result in two different mRNAs.

A point mutation might have altered the gene.

Different transcription factors were involved in the transcription of the two mRNAs.

Exons are cut out of the primary transcript, and the introns are spliced together.

Introns are cut out of the primary transcript, and the resulting exons are spliced together.

Introns are cut out of the primary transcript and spliced together at the end of the transcript.

Exons are cut out of the primary transcript and transported to the endoplasmic reticulum.

Both introns and exons are transcribed, but the RNA transcribed from introns does not leave the nucleus.

Both introns and exons are transcribed, but neither type of transcribed region leaves the nucleus.

Exons are not transcribed.

RNA splicing

action of repressors and activators

DNA packaging into nucleosomes

All of the listed responses are correct.

In bacteria, proteins called transcription factors enhance the affinity of RNA polymerase to the promoter sites of genes.

In bacteria, transcription of a gene is initiated when the RNA polymerase by itself recognizes and binds to the promoter of the gene.

The initiation of gene transcription in eukaryotes requires the binding of proteins called transcription factors to the TATA box in the promoter region of a gene.

All of the answer choices are correct.

the promoter region acts as an initial binding site for RNA polymerase

the RNA nucleotides used are produced by the cell

only one of the DNA strands is used as the template

intron

AUG codon

Promoter

centromere