OCR A Level Biology

Biology

Modules 2-6

Sample Data

Front How does Sanger sequencing allow the sequence of bases to be determined?
Back - At any time, DNA polymerase can insert one of the terminator bases by chance which results in the termination of DNA replication.- Because each of the test tubes only contains one type of terminator bases, it is possible to know what the terminal nucleotide of each fragment is.- Because the point at which the terminator base is inserted varies with every strand, complementary DNA chains of varying lengths are produced
Front Explain how axon diameter affects the speed at which action potentials travel.
Back - the bigger the axon diameter, the faster the impulse is transmitted- this is due to less resistance to the diffusion of ions through the cytoplasm
FrontText What lines insects' tracheae to prevent gas exchange and support the tube?
FrontAudio
BackText spirals of chitin
BackAudio
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