Science 7th Final 1

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Science 7th Final 1
2012-01-17 00:50:49
7th grade life science final

7th grade life science final ch 1 - 3
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  1. Starch is an example of
  2. What produces carbon dioxide?
  3. Cytokinesis
    • Cytoplasm divides
    • half of the organelles are distributed into the new cells
  4. DNA and RNA are
    nucleic acids
  5. An energy releasing process that does not require oxygen
  6. The organelle in which photosynthesis takes place is
  7. Element
    Substance that can't be broken down further
  8. Main method by whihc small molecules move across cell membranes
  9. Process by which water moves across cell membrane
  10. Active transport
    requires cell to use own energy
  11. passive transport
    cell does not use energy
  12. Interphase - 3 steps
    • cell grows
    • makes a copy of DNA
    • prepares to divide into 2 cells
  13. Mitosis
    one copy of DNA is distributed into each of the 2 daughter cells
  14. Cell Cycle - 3 phases
    • Interphase
    • Mitosis -prophase, metaphase, anaphase, telophase
    • Cytokinesis
  15. 4 phases of mitosis
    • prophase
    • metaphase
    • anaphase
    • telophase
  16. Prophase
    chromatin in nucleus condenses to form chromosomes. Pairs of centrioles move to opposite sides. Spindle fibers for a bridge between the ends of the cell. Nuclear envelope breaks down.
  17. Metaphase
    • chromosomes line up across center of cell
    • each chromosome attaches to a spindle fiber at its centromere
  18. Anaphase
    • centromeres split and the 2 chromatids separate
    • One chromatid is drawn by its spindle fiber to one end of the cell.
    • The other moves to the opposite end
    • Cell stretches out as the opposite ends are pushed apart
  19. Telophase
    • chromosomes begin to stretch out and lose their rodlike appearance.
    • New nuclear envelope forms around each region of chromosomes
  20. DNA replication occurs during
  21. During DNA replication adenine pairs with
  22. Guanine pairs with
  23. Prediction
    making a forecast of what will happen in the future based on past experience or evidence.
  24. Model
    creating a representation of complex object or process
  25. Quantitative Observation
    Numbers or amounts
  26. Qualitative Observation
    Descriptions that cannot be expressed in numbers
  27. Operational definition
    statement that describes how to measure a particular variable or how to define a particular term.
  28. Enzyme
    a protein that speeds up chemical reactions
  29. Carbohydrate
    energy rich organic compound made of elements carbon, oxygen & hydrogen. Starches and sugars
  30. Lipids
    Fats, oils and waxes. Cells store energy in lipids for later use
  31. Proteins
    • made up of amino acids
    • form cell membranes and make up organelles
  32. 4 organic compounds
    • carbohydrate
    • lipid
    • protein
    • nucleic acid
  33. Controlled experiment
    only one variable is manipulated
  34. manipulated variable
    one variable that is purposely changed to test a hypothesis
  35. hypothesis
    • possible explanation for a set of observations or answer to a specific question
    • Must be testable
  36. Operation definition
    statement that describes how to measure a variable or define a term
  37. Transport proteins
    Transport proteins in the cell membrane pick up molecules outside the cell and carry them in, using energy
  38. Technology
    • how people change the world around them
    • improves the way people live
  39. 6 characteristics that all living things share
    • cellular organization
    • similar chemicals
    • use energy
    • respond to surroundings
    • grow and develop
    • reproduce
  40. cell
    basic unit of structure and function in an organism
  41. 4 needs of living things
    • water
    • food
    • living space
    • homeostasis
  42. 6 stages of scientific inquiry process in order
    • posing questions
    • developing a hypothesis
    • designing an experiment
    • collecting & interpreting data
    • drawing conclusions
    • communicating
  43. Fermentation
    provides energy for cells without using oxygen
  44. Alcoholic fermentation
    • yeast and other single cell organisms break down sugars
    • Makes bread dough
  45. Lactic acid fermentation
    • when you exercise it occurs in your body
    • muscle cells use up oxygen faster than it can be replaced
    • lactic acid builds up and you feel pain
  46. 3 functions water performs in cells
    • osmosis
    • chemical reactions
    • growth
  47. What 2 molecules make up the sides of the DNA ladder
    • Deoxyribose - molecules of a sugar
    • Phosphates
  48. Respiration Equation
    • C6H12O6 + 6 O2 ----> 6 CO2 + 6 H2O + energy
    • sugar oxygen carbon dioxide water
  49. Photosynthesis equation
    • light energy
    • 6 CO2 + 6 H2O -------> C6H12O6 + 6 O2
    • carbon dioxide water sugar oxygen