Topic 2.7: DNA Replication, Transcription & Translation

The diagram represents transcription and translation. What structures do the letters X and Y represent?

• X: DNA

  Y: anticodon

• X: mRNA

  Y: anticodon

• X: DNA

  Y: codon

• X: mRNA

  Y: codon

Tags

NGSS.HS-LS1-1

For what did Meselson and Stahl’s work provide evidence?

• The abiotic origin of organic molecules

• The cell theory

• The fluid mosaic model of membrane structure

• The semi-conservative replication of DNA

The gene that codes for a particular polypeptide includes the base sequence shown.

GAGTACCCT

What is the base sequence of the mRNA molecule which is complementary to this sequence?

• GAGTACCCT

• CTCATGGGA

• GUGTUCCCT

• CUCAUGGGA

Tags

NGSS.HS-LS3-1

Where are amino acids joined together to make polypeptides?

• Nucleus

• Nucleolus

• Golgi apparatus

• Ribosomes

The table shows some codons for five amino acids. Which of these DNA strands will code for the amino acid sequence glycine-serine-glycine?

• CCUUCGCCG

• CCTTCGCCG

• GGAAGCGGA

• CCUUCGCCU

Tags

NGSS.HS-LS1-1

What do DNA replication, transcription and translation have in common?

• Take place in cell nucleus

• Require free nucleotides

• Catalysed by polymerase

• Complementary base pairing

Meselson and Stahl conducted experiments using the isotopes ¹⁴N and ¹⁵N which showed that DNA replication is semi-conservative. What would they have observed about the distribution of isotopes in the DNA after one round of replication if DNA replication was conservative rather than semi-conservative?

• Only ¹⁴N DNA

• Only ¹⁵N DNA

• All DNA half ¹⁴N and half ¹⁵N

• Half the DNA with only ¹⁴N and half with only ¹⁵N

Tags

NGSS.HS-LS1-1

Which are necessary to make DNA replication semi-conservative?

I. Separation of the strands by RNA polymerase

II. Complementary base pairing

III. Use of a pre-existing strand as a template

• I and II only

• I and III only

• II and III only

• I, II and III

This is a sequence of nucleotides from a section of mRNA.

AUGAAACGCACGCAG

From which DNA sequence has it been transcribed?

• ATGAAACGCACGCAG

• UACUUUGCGUGCGAC

• TACUUUGCGTGCGTC

• TACTTTGCGTGCGTC