DNA replication & Gene expression

By what model does DNA replication occur?

• Conservative replication

• Dispersive replication

• Semi-conservative replication

In an experiment, bacteria were cultivated in 14N medium and transferred to 15N medium to undergo two rounds of replication. What bands would you see in the second generation of bacteria?

• Only one band of 14N15N DNA

• One band of 14N15N DNA & one band of 14N14N DNA

• One band of 14N15N DNA & one band of 15N15N DNA

• Two bands of 14N15N DNA

Which of these proteins are involved in proofreading and replacement of RNA primers?

• Topoisomerase

• DNA polymerase III

• Primase

• DNA polymerase I

• DNA ligase

If the leading strand is being synthesised in the 5' to 3' direction, what direction is the lagging strand being synthesised in?

• 3' to 5'

• 5' to 3'

• 3' to 3'

• 5' to 5'

Which portion of a daughter DNA strand does the end replication problem affect?

• 5' end

• middle

• 3' end

Which sentence is correct?

• The genetic code is degenerated

• Genes are degenerate

• Degeneration of the genetic code occurs

• The genetic code is degenerate

During transcription initiation in prokaryotes, RNA polymerase binds to...

• Pribnow box

• TATA box

• Pribnow box + transcription factors

• TATA box + transcription factors

Which sentence is NOT correct?

• DNA is transcribed into mRNA

• mRNA is transcribed using DNA

• RNA polymerase transcribes DNA to synthesise mRNA

• An mRNA transcript is used in translation

When the A site of a ribosome reaches a stop codon, a protein known as a ___________ ____________ binds to the stop codon.

The aminoacyl-tRNA complex is formed by the binding of which of these substances?

• Amino acid

• Aminoacyl-tRNA synthetase

• AMP

• ATP

• tRNA