Water

• What type of bond is depicted in a water molecule?

  A polar bond with slight charges.

  
• What are the lubricant properties of water?

  Water acts as a biological lubricant.
• Why is water transparent?

  It allows the passage of visible light.
• What types of substances are easily soluble in water?

  Ionic and polar substances.
• How does water act as a transport medium?

  For polar solutes in biological systems.
• What is the joule equivalent of a calorie?

  1 J = 0.239 cal.
• What is the significance of water in biochemical reactions?

  It is the medium for all reactions.
• What is the simplest organic molecule?

  Methane (CH4).

  
• What are the properties of water explained by hydrogen bonding?

  • Solvent properties
  • Thermal properties
  • Density
  • Cohesion and surface tension
  • Incompressibility
• How are molecules of living tissue characterized?

  Molecules of living tissue are varied and complex.
• What are the thermal properties of water?

  Water absorbs and releases heat with slight temperature change.
• What is an element?

  Only one type of atom that cannot be broken down.
• What is cohesion in water molecules?

  Hydrogen bonds hold water molecules together.

  
• What characterizes a polar bond in a water molecule?

  Slightly positive charge on hydrogen, negative on oxygen.
• What allows a continuous column of water to flow up the xylem?

  Cohesion and adhesion between water molecules.
• What is evaporative cooling?

  Cooling process as liquid evaporates.
• What forms hydrogen bonds?

  Between slightly positive and negative charges of polar molecules. Between molecules with a Hydrogen or a N,O,F