8. cell membrane function\nwhat is the main function of a cell membrane?\na. to control what enters and…

8. cell membrane function\nwhat is the main function of a cell membrane?\na. to control what enters and leaves the cell\nb. to give the cell energy\nc. to store information\nd. to digest nutrients\n\n9. moon phases\nwhy do we see different phases of the moon?\na. the moon changes shape\nb. the moon moves through earths shadow\nc. the moon reflects sunlight differently as it orbits earth\nd. clouds block the view sometimes\n\n10. electric circuits\nwhich of the following is required for a complete electric circuit?\na. a wire and a switch\nb. a source of water\nc. a loop of conductors and a power source\nd. a magnet and battery only\n\n11. engineering constraints\nin a school project to build a solar oven, what would be considered a constraint?\na. how well it works\nb. the materials available\nc. the goal of cooking food\nd. the suns temperature

8. cell membrane function\nwhat is the main function of a cell membrane?\na. to control what enters and leaves the cell\nb. to give the cell energy\nc. to store information\nd. to digest nutrients\n\n9. moon phases\nwhy do we see different phases of the moon?\na. the moon changes shape\nb. the moon moves through earths shadow\nc. the moon reflects sunlight differently as it orbits earth\nd. clouds block the view sometimes\n\n10. electric circuits\nwhich of the following is required for a complete electric circuit?\na. a wire and a switch\nb. a source of water\nc. a loop of conductors and a power source\nd. a magnet and battery only\n\n11. engineering constraints\nin a school project to build a solar oven, what would be considered a constraint?\na. how well it works\nb. the materials available\nc. the goal of cooking food\nd. the suns temperature

Answer

Brief Explanations:

  • Question 8: The cell membrane is a selectively - permeable barrier. Its main role is to control the movement of substances in and out of the cell.
  • Question 9: The moon doesn't change shape. The different phases we see are due to the changing angles at which the moon reflects sunlight as it orbits Earth.
  • Question 10: A complete electric circuit requires a closed - loop of conductors (to allow the flow of electric current) and a power source (to provide the energy for the current).
  • Question 11: In an engineering project like building a solar oven, the materials available can limit what can be constructed and how the project is carried out, making it a constraint.

Answer:

  1. A. To control what enters and leaves the cell
  2. C. The moon reflects sunlight differently as it orbits Earth
  3. C. A loop of conductors and a power source
  4. B. The materials available