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5 Written questions

5 Matching questions

  1. What two properties of water do plants take advantage of, to move water against gravity, explain?
  2. Does form impact function?
  3. Know functional group NAMES, MOLECULAR FORMULAS, and STRUCTURES!
  4. Draw functional group structure and give molecular formula for: Hydroxyl.
  5. Draw functional group structure and give molecular formula for: Carboxyl.
  1. a Cohesion and Adhesion.
    Cohesion - waters ability to stick to ITSELF (other water molecules)
    Adhesion - waters ability to stick to OTHER THINGS that are POLAR
  2. b Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, and Methyl
  3. c Carboxyl (-COOH) acidic properties, components of many biologically important molecules; C double bonded to O and single to OH



    Ex: Formic acid or acetic acid
  4. d Hydroxyl (polar, form hydrogen bonds, polar solvents)
    −OH (may be written HO-)
    Ex: Alcohols, such as Ethanol
  5. e YES!

5 Multiple choice questions

  1. Hydrogen bonds in water hold each other together stronger than they'd bond to the air, for example. Ex: Jesus Christ lizard can walk on water because of it's surface tension; a dragonfly has non-polar exoskeleton so water beads on it
  2. Organic molecules composed solely of Carbon and Hydrogen; Nonpolar covalent bond so they resist/repel water (ex: fat)
  3. Solvent: Substance doing the dissolving (water)
    Solute: Substance being dissolved (sugar or salt)
    Solution: homogenous mixture (product of solvent & solute)
  4. Methyl (−CH₃) (sex hormones, DNA methylation (when it gets tagged onto your DNA); C single bonded to 3 H's

    −C − H

    Ex: 5-methyl cytidine
  5. Resistance to change in temperature

5 True/False questions

  1. Why is water in the solid phase less dense? How does this support life?Hydrogen bonds keep the molecules spread out, so they don't pack together, making them less dense.
    The floating ice insulates the body of water underneath it; if ice sank, then all the bodies of water would freeze solid, making life unlivable.


  2. Organic molecules must always contain what?WATER!


  3. Describe how and why hydrogen bonds form in water.Hydrogen bonds are the bonds between two polar molecules - one with a partial positive charge and one with a partial negative charge; water is perfect for this because it has the partial negative of Oxygen and the partial positive of Hydrogen.


  4. What is the pH scale?pH is the measurement used to quantify the H⁺ ion concentration in an aqueous (water) solution


  5. What is the Universal Solvent?WATER!


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