AP Bio. Unit 6

Which of these options does NOT describe a eukaryotic organism's DNA?

• A and T pairs will be approximately equal to C and G pairs

• It is double stranded and linear

• It forms chromosomes that are circular

• It is semi-conservative when it replicates

Which of these enzymes is NOT involved in DNA replication?

• Ligase

• RNA Polymerase

• Helicase

• Topoisomerase

What process is occurring here?

• Translation, because amino acids are being produced

• Replication, because DNA is being copied

• Transcription, because amino acids are being produced

• Transcription, because mRNA is being produced

What will be produced from the DNA code 5'-CCA TAT AGG-3' after translation?

• 3'-GGT ATA TCC-5'

• Proline, Isoleucine, Arginine

• 3'-GGU AUA UCC-5'

• Glycine, Isoleucine, Serine

Which of these best describes this image?

• Noncoding introns are being spliced to create mature mRNA

• Noncoding exons are being spliced to create mature mRNA

• Introns are being added to exons to create mature mRNA

• The finished polypeptide is being folded into its final shape

Which of these mutations would result in no change to the amino acid chain?

• GCCGAU is changed to GCCGAAU

• GCCGAU is changed to CCGAU

• GCCGAU is changed to GCAGAC

• GCCGAU is changed to GACGAU

Which of these sequences would be unable to complete translation?

• AUG-CCA-CGA-UUA

• AGU-CAG-UUA-AUA

• AUG-UUA-GGA-CCC

• AUG-CGC-AAU-UAU

The repressor for this operon is shown in green. Is the repressor active or inactive in the first diagram? What is the result?

• Repressor is active, transcription cannot occur

• Repressor is inactive, transcription cannot occur

• Repressor is active, transcription can occur

• Repressor is inactive, transcription can occur

In order for the lac operon to be active, lactose must be present as an inducer to bind to the repressor and remove it from the operator. Which diagram shows the lac operon in an active form?

• A

• B

• A and B

• Neither

This operon is currently off. Which of these describes how to turn it on?

• Remove tryptophan so that the repressor becomes inactive

• Add tryptophan so that the repressor becomes inactive

• Increase the amount of RNA polymerase present

• Genetically modify the promoter site to accept additional tryptophan