AQA Biology Unit 5

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1. Which is a difference between mRNA and tRNA?

  • tRNA as hydrogen bonds, mRNA doesnt
  • mRNA has an amino acid binding site, tRNA doesnt
  • tRNA is linear,mRNA is clover-leafed shaped
  • tRNA has a codon, mRNA has an anticodon
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2. What is the role of RNA polymerase in transcription?

  • Join RNA nucleotides together to form a strand with phosphodiester bonds
  • Join DNA nucleotides together to form a strand with phosphodiester bonds
  • Join RNA nucleotides together to form a strand with hydrogen bonds
  • Join DNA nucleotides together to form a strand with hydrogen bonds

3. What is the role of troponin?

  • To activate ATPase
  • To bind to Calcuim ions causing tropmyosin to move, exposing actin binding sites
  • To form a cross bridge between myosin and troponin
  • To bind to tropmyosin

4. What is meant by homeostasis?

  • Chemical reactions
  • Maintaining a constant external environment
  • Maintaining a constant internal environment
  • How kidneys work

5. Why is a gene longer than the resulting mRNA?

  • mRNA contains only introns
  • Start and stop condons
  • mRNA contains only exons
  • siRNA breaks up mRNA

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Indiaistrying

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sass master, good quiz though thank you

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