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Cell membrane is

A. permeable

B. semipermeable

C. selectively permeable

D. impermeable

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  3. Which of the following is in liquid form at room temperature ?
  4. When a gas is turned into a liquid, the process is called
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  17. Rust is
  18. In an atomic nucleus, neutrons and protons are held together by
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  20. The removal of top soil by water or wind is called
  21. Which of the following characters is not shown by hydrogen
  22. The smallest functional and structural unit of kidney is called as
  23. The fastest acting enzyme in the biological kingdom is
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  25. The solar eclipse occurs when
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