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7.3 past papers

Quiz by Dr. Reza M

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13 questions
Show answers
  • Q1
    The image shows a polysome in a bacterial cell. How many genes have been transcribed?
    Question Image
    2
    4
    1
    3
    30s
  • Q2
    What are polysomes?
    Complexes of tRNA with amino acids
    Strings of amino acids
    Packages of eight histones with DNA
    Many ribosomes joined to one mRNA
    30s
  • Q3
    Which cell component synthesizes actin and myosin?
    Nuclear membrane
    Rough endoplasmic reticulum
    Free ribosomes
    Smooth endoplasmic reticulum
    30s
  • Q4
    Which structure found in eukaryotes has a single membrane?
    Chloroplast
    Lysosome
    Mitochondrion
    Nucleus
    30s
  • Q5
    Which types of interactions are found in a part of a protein with secondary but not tertiary structure? I. Hydrogen bonds II. Disulphide bridges III. Ionic bonds
    I and II only
    II and III only
    I only
    I, II and III
    30s
  • Q6
    This image is taken from a visualization of a eukaryotic ribosome. The arrows show the direction of movement of mRNA. Which letter represents a tRNA exiting from the E site?
    Question Image
    D
    A
    B
    C
    30s
  • Q7
    Scientists have heated a solution containing the protein albumin and measured its relative alpha helix content, shown on the graph. What does the zone labelled X indicate?
    Question Image
    Rapid increase in beta pleated sheets
    Rapid decrease in peptide bonds
    Rapid formation of hydrogen bonds
    Rapid increase in denatured protein molecules
    30s
  • Q8
    Where does a tRNA-activating enzyme attach the appropriate amino acid to the tRNA molecule?
    Question Image
    D
    B
    A
    C
    30s
  • Q9
    What does post-transcriptional modification of eukaryotic mRNA include? I. Introns are removed from mRNA. II. Exons are joined together to form mature mRNA. III. A 5' cap and 3' poly-A tail are added to mRNA.
    II and III only
    I and III only
    I only
    I, II and III
    30s
  • Q10
    Variations in the types of antibodies are produced by mRNA splicing. What is an advantage of this process?
    Speeds up transcription of antibodies
    Ensures that one gene codes for one antibody
    Increases the number of different antibodies that can be synthesized
    Reduces the size of mRNA required for the translation of antibodies
    30s
  • Q11
    The image represents a model of the protein transthyretin.
    Question Image
    Tertiary
    Secondary
    Primary
    D. Quaternary
    30s
  • Q12
    The image shows the structure of hemoglobin. What determines the primary structure of hemoglobin?
    Question Image
    Genetic information
    Four polypeptide chains
    Hydrogen bonding
    Side chain interactions
    30s
  • Q13
    The following diagram shows a ribosome during translation. What describes the specific stage of translation?
    Question Image
    Elongation
    Termination
    Initiation
    Translocation
    30s

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