Cells and organisms / organic molecules

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1. If endocrine is the long distance intercellular signalling using hormones, what is paracrine?

  • Local cell signalling
  • Long distance using electrical impulses
  • Long distance using proteins
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2. What is the sole purpose of variation in viral shape?

  • Navigation of specific mediums.
  • Ensuring that virus can get into specific target cell.
  • Defence again specific anti-virals.
  • Adherence to specific surfaces.

3. Name of things which gravitate towards opposite ends of cell during mitosis/ meiosis to aid cell division.

  • Reticula
  • Centrioles
  • Lysosomes
  • Mitochondria

4. Name of thing which is the site of aerobic respiration; ATP-generating reactions happen in its inner matrix.

  • Nucleus
  • Mitochondria
  • Centrioles
  • Cytoplasm

5. True or false: multicellular systems cannot rely on diffusion of chemicals across membranes. Control of metabolic change/ internal environment relies on intercellular communication.

  • True
  • False
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