BIO2 - Biological molecules and their tests.

Revision quiz for the F212 'Molecules, biodiversity, food and health' exam, focussing on the 'biological molecules chapter.

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  • Created by: RhysWall
  • Created on: 13-04-12 15:43

1. Define what is meant by the term 'covalent bond'

  • Strong bonds formed when electrons are shared between atoms, causing a new molecule to be formed
  • Weak bonds formed when the polar nature of an atom caused an electonegative oxygen atom to form a bond with an electropositive hydrogen atom
  • Bonds formed when a positive region of a molecule is attracted to a negative region
  • When part of the molecule is repelled from water and another part is attracted to it
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2. Ester bonds, peptide bonds, glycosidic bonds and disulphide bridges are all covalent bonds

  • True
  • False

3. The monomer (subunit) of a protein is a:

  • Nitrogenous base
  • Amino acid
  • Peptide bond
  • Monosaccharide such as alpha glucose

4. The breakage of a glycosidic bond occurs in a:

  • Condensation reaction where a water molecule is removed
  • Hydrolysis reaction where a water molecule is added
  • Hydrolysis reaction where a water molecule is removed
  • Condensation reaction where a water molecule is added

5. Water is a liquid at room temperature because:

  • Bacteria live in it, cooling it down
  • Condensation reactions maintain its form
  • More energy is required to overcome the hydrogen bonds
  • There is no water potential gradient into the air
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