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6. What bond is between amino acids

  • Hydrogen bond
  • Ionic bond
  • Peptide bond
  • Disulphide bond

7. Define Taxis

  • The growth of a plant in response to a directional stimulus
  • A movement that bares some relationship to the location of the stimulus
  • Random movement in response to a stimulus
  • Movement towards sunlight for photosynthesis

8. What is recombinant DNA?

  • Sections of DNA from two species
  • A bacterial plasmid
  • A vector
  • Restriction enzymes

9. What is meant by refractory period?

  • Polarisation
  • No new action potentials produced in this time
  • Threshold potential
  • A levels that needs to be over come to produce a action potential

10. What is a Codon?

  • Three paired bases forming an amino aicd
  • Freeflloating RNA nucleotides
  • Three unpaired bases on mRNA that code for an amino acid
  • Three unpaired bases on tRNA that code for an amino acid

11. How is resting potential established in an axon?

  • Active transport of sodium ions out of an axon
  • Active transport of sodium ions into an axon
  • Diffusion of sodium ions out of an axon
  • Active transport of potassium ions out of an axon

12. How does panting lead to heat loss?

  • Activates the heat gain centre in hypothalamus
  • Causes vasoconstriction
  • Evaporation of water from the lining of the mouth, heat transferred from blood
  • Increases thirst so organism drinks more to cool self down

13. Define Tropism

  • A growth movement of part of a plant in response to a directional stimulus
  • Random movement in response to a stimulus
  • A movement that bares some relationship to the location of the stimulus
  • Muscular Contractions

14. What is the role of troponin?

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

15. Define Kinesis

  • A growth movement of part of a plant in response to a directional stimulus
  • A non-directional response to a stimulus
  • Ability to influence/manipulate/move matter with ones mind
  • A directional response to a stimulus

16. What is meant by homeostasis?

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

17. Describe how hormones and local chemical mediators reach the cells they affect

  • Active Transport
  • Hormones spread by diffusion, L.C.M in the blood
  • Hormones in the blood, L.C.M spread by diffusion.
  • Both diffuse into cells from the blood

18. 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

19. Define degenerate

  • An amino acid can be coded for by more than one triplet
  • Multiple codons code for a triplet code
  • Lots of amino acids code for a triplet
  • A codon can be coded for by more than one triplet

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

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