APBioUnit5Test

During DNA replication, what is the function of the helicase?

• seal fragments

• add nucleotides

• separate DNA strands

• produce RNA primer

Which of the following is associated with eukaryotic cells?

• 5' cap and 3' tail

• operons

• circular DNA

• bacteria

Nerve cells differ from heart cells in that they

• have a different nucleotide sequence.

• express different genes.

• have different chromosomes.

• have a different genome.

Which of the following best explains the purpose of restriction enzymes during genetic experiments?

• they produce repressor proteins

• they splice together exons

• they seal DNA fragments together

• they cut DNA at restriction sites

Which of the following would decrease the rate of transcription in eukaryotic cells?

• the inactivation of a repressor protein on a lac operon

• the addition of methyl groups to the cytosines of DNA

• the addition of acetyl groups to histones

• the binding of activators to distal enhancers

Which of the following would most likely have the smallest impact on the production of a functioning protein?

• a silent mutation

• a missense mutation

• a deletion mutation

• an insertion mutation

During DNA replication, what is true of the RNA primer?

• attach to the leading strand only

• attach to both the leading and lagging strand

• extend telomeres

• separate DNA strands

When allolactose binds to the repressor of a lac operon, the repressor becomes inactivated. Which of the following is true?

• Allolactose acts as an inhibitor by decreasing transcription.

• Allolactose is produced by the regulatory gene.

• Allolactose acts as an inducer to deactivate the repressor.

• Allolactose terminates protein synthesis.

Which of the following is true?

• A = G

• A + T = G + C

• T = C

• A + C = G + T

Which of the following is true?

• Telomerase helps extend the telomeres.

• DNA ligase adds new nucleotides to the growing chain

• DNA polymerase seals together Okazaki fragments.

• The helicase relieves tension ahead of the replication fork.