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DP IB Biology: HL

Topic Questions

Home / IB / Biology: HL / DP / Topic Questions / 2. Molecular Biology / 2.6 Transcription & Translation / Multiple Choice: Paper 1


2.6 Transcription & Translation

Question 1

Marks: 1

A polypeptide has the following amino acid sequence:

alanine - alanine - valine - lysine - valine - serine

The table below gives the base sequences for the DNA triplets of each amino acid.

Amino acid DNA triplet
serine TCG
valine GTA
lysine AAA
alanine GCT
stop TAA

A mutation in the DNA coding for this polypeptide chain caused the tenth nucleotide to change from an A to a T.

Which of the following would represent the amino acid sequence in the polypeptide after the mutation occurred?

  • alanine - alanine - valine - lysine - valine - serine

  • alanine - alanine - valine - stop - valine - serine

  • alanine - alanine - valine

  • alanine - alanine - valine - serine - valine - serine

Choose your answer
  
Key Concepts
Deducing the Sequences

Question 2

Marks: 1

Which of the following processes involve both DNA and RNA?

I. Replication

II. Transcription

III. Translation

IV. Protein synthesis

  • I and II

  • I, II and IV

  • III only

  • II and IV

Choose your answer
  

Question 3

Marks: 1

The following steps are involved in the process of replicating DNA by polymerase chain reaction (PCR).

  1. The temperature is increased to 72°C to allow Taq polymerase to bind to DNA
  2. A new complementary strand of DNA is produced 
  3. The temperature is raised to 95°C to cause denaturation of the DNA molecule
  4. Primers attach to the ends of single strands of DNA by hydrogen bonding
  5. The temperature is decreased to about 54°C

Which of the following represents the correct order of the steps?

  • 1 → 3 → 4 → 5 → 2

  • 3 → 5 → 4 → 1 → 2

  • 1 → 3 → 5 → 4 → 2

  • 3 → 4 → 5 → 1 → 2

Choose your answer
  

Question 4

Marks: 1

A short section of mRNA that was produced after transcription occurred has the following base sequence:

AAACUUCUCAUAGAACGG

The following table shows the base sequence for codons and the corresponding amino acids that they code for.

2-6-hard-q4

Which of the following would represent the correct amino acid sequence coded for by this section of mRNA?

  • Lysine - Leucine - Proline - Asparagine - Glycine - Alanine

  • Lysine - Phenylalanine - Proline - Lysine - Glycine - Alanine

  • Lysine - Leucine - Threonine - Asparagine - Arginine - Arginine

  • Lysine - Leucine - Proline - Asparagine - Arginine - Alanine

Choose your answer
  
Key Concepts
Deducing the Sequences

Question 5

Marks: 1

A polypeptide has the following amino acid sequence:

histidine - glutamine - lysine - alanine - valine - histidine - valine

The table below gives the tRNA anticodons for each amino acid.

Amino acid tRNA anticodons
histidine CAU
valine GUA
lysine AAA
alanine GCU
glutamine CAG

A mutation causes the 18th base in the DNA sequence to be deleted. 

Which of the following would represent the amino acid sequence after this deletion?

  • histidine - glutamine - lysine - alanine - valine - histidine

  • histidine - glutamine - lysine - alanine - valine 

  • histidine - glutamine - lysine - alanine - valine - glutamine

  • histidine - glutamine - lysine - alanine - valine - histidine - valine

Choose your answer
  
Key Concepts
Deducing the Sequences