biology everything 1-5

• t4 explain natural selection

  There is genetic variation within a population.There is also selection pressures like(higher up trees) this results in the better adapted animals being able to get more food and reproduce and have offsprings with the same characteristic
• how can we detect starch?


  by adding iodine if starch is present it will turn from orange to blue-black
• what is meant by a polymer


  a repeating chain of nucleotides
• what does the detergent do?

  breaks down the fruits cell membrane
• what does the added salt do?

  it sticks the DNA together
• explain how nurones diffuse across the synapse

  there is a chemical signals known as neurotransmitters that diffuse across the synapse and bind the receptor cells in the the other nurone generating an electrical impulse
• lipids into...


  lipase fatty acids
• proteins into...


  protease, aminoacids
• sartch into...


  amalyse and sugar
• interphase


  DNA duplicates, organelles like mitrochondria and ribisomes condese
• during anaphase spindle fibres are pulled appart and chromosones end up on either poles of the cells
• telophase


  cell membrane forms around each chromosne forming a nucleus
• prophase


  the cell membrane breaks down, chromosones condense
• conversions


  milli,micro, nano, pico
• gene


  smallest section of an organisms DNA that codes for a protein
• name cell formed after fertilistaion 


  zygote
• this is an image of a sensory nurone a sensory nurone has one long sensor one carrying an impulse to the cell body and one short axon carrying the impulse away from the cell body

  
• the motor but one has short dentries that carry the CNS to the cell body it then travels across the axon that is covered in a mylien sheath that helps insulate the axon