Bacterial metabolism (45 marks)

 

First question:   (30 marks, 5 for each)

Write short notes on (use diagrams when possible):

  1. Photosystem II.
  2. Phosphoketolase pathway.
  3. Carbon cycle.
  4. Types of antibiotics.
  5. Kreb's cycle.
  6. Stationary phase.

Second question:  (10 marks, 1 mark for each space)

Complete the following:

  1. Nutrients can get into the bacterial cell by three mechanisms: ……………, …………… and ……………
  2. Light-harvesting pigments are ……………, …………… and ……………
  3. The reduced end product during aerobic respiration is …………… and it is …………… for methanogenesis.
  4. BOD is ……………
  5. TAG is metabolized by …………… producing phosphatidic acid.

Third question (5 marks, 1 mark for each)

  Choose the correct word between the brackets:

 

  1. A chemostat is an instrument using a system of (batch – continuous – synchronous) cultures.
  2. Nalidixic acid inhibits the synthesis of (cell wall- nucleic acids- proteins- cell membranes).
  3. Biosorption takes place in (living - non-living - both living and non-living) cells.
  4. PHAs are (lipid- carbohydrate- polypeptide- polyphosphate) reserve materials.
  5. Obligate anaerobes lack (catalase – peroxidase – catalase and peroxidase - superoxide dismutase).