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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