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6. which of the following statements is false?

  • cytosine always pairs with thymine
  • dna has a double helix structure in humans
  • adenine and thymine always pair
  • guanine and cytosine are complementary bases

7. A/n ______microscope magnifies x 10 million

  • modern
  • atomic
  • electron
  • light

8. Which of these substances leave through the cell membrane?

  • carbon dioxide
  • glucose
  • oxygen
  • cytoplasm

9. When separting pure DNA,which of the following substances are used?

  • vodka
  • ethanol
  • amylase enzyme
  • hydrochloric acid

10. A/n ____microscope magnifies x2000

  • modern
  • atomic
  • light
  • electron

11. which of the following statements are wrong?

  • chloroplasts allow animal cells to photosynthesize
  • mitochondria are tiny structures where respiration occurs,releasing energy for cell processes
  • the cell membrane controls what enters or leaves a cell
  • the central vacuole of a plant cell contains cell sap which keeps the cell rigid,so plants don't have skeletons

12. What is the role of the cell wall of a plant cell?

  • it controls what enters and leaves the cell
  • it is tough so helps support the cell and helps it keep its place
  • it contains cell sap so keeps the plant turgid
  • it keeps out pathogen

13. which of these are found in animal cells?

  • celluose cell wall
  • central vacuole
  • cytoplasm
  • chloroplasts

14. What is the difference between a bacterial cell and a plant or animal cell?

  • They have no cell wall
  • They have no nucleus
  • They have flagellum
  • They have two nuclei