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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