1. which of the following statements is false?

  • dna has a double helix structure in humans
  • cytosine always pairs with thymine
  • guanine and cytosine are complementary bases
  • adenine and thymine always pair
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2. which of the following statements are wrong?

  • chloroplasts allow animal cells to photosynthesize
  • 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
  • mitochondria are tiny structures where respiration occurs,releasing energy for cell processes

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

  • hydrochloric acid
  • amylase enzyme
  • ethanol
  • vodka

4. A/n ______microscope magnifies x 10 million

  • modern
  • atomic
  • electron
  • light

5. A fruit is mashed with salty water and detergent. What does this do to the cells of the fruit?

  • Nothing
  • They are separated individually in the mixture in a solid form
  • They are broken open and nuclei released
  • They are destroyed completely


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