Biology Unit 1 NAR

Plasma(cell) membrane-controls entry and exit of substances
1. Nucleus-controls some cell activities; contains DNA
  1. Ribosomes-site of protein synthesis
    1. Mitochondrion-site of aerobic respiration
      1. Cytoplasm-site of some chemical reactions
chloroplast-site of photosynthesis; contains chlorophyll
1. vacoule-cell sap reservoir;has dissolved reservoir
Diffusion- movement of molecules of a substance from an area of high concentration to an area of low concentration along a concentration gradient through a selectively permeable membrane until evenly spread
1. Osmosis- movement of water molecules from an are of high water concentration(HYPOTONIC) to an area of low water concentration(HYPERTONIC) along a concentration through a selectively permeable membrane until evenly spread.(ISOTONIC)
Active Transport
1. needs energy
2. movement against a concentration gradient
  1. low to high concentration
  2. mainly for ions
  3. uses CARRIER PROTEIN to 'carry' ions across cell membrane
    1. glucose- more glucose more respiration
      1. oxygen- more oxygen more respiration
  4. warmer-enzymes work faster
    1. optimum 35-40C
    2. too hot it stops and the enzymes denature.
      1. carrier also loses its shape.

Resource summary

	Created by WILL.I.AM over 10 years ago