Introduction CH357 to Microbiology Quiz 02 30 points H hour
Cadet ________________________ Academic term 2008-1
(4) 1. Bacterial cell size is limited by a. the uptake of nutrients from the environment. b. the segregation of DNA into daughter cells. c. the amount of peptidoglycan in the cell envelope. (4) 2. Ether linkages can be found in the membrane lipids of a. Eubacteria b. Eukaryotes c. Archaea d. none of the above (4) 3. The cellular energy for group transport comes directly from a. the concentration gradient of the solute. b. the hydrolysis of phosphoenolpyruvate. c. the proton motive force. two d. D cells. (4) 4. The function of the capsule is a. to prevent dehydration. b. protect from protozoan grazing. c. to attach the bacterium to a surface. d. all of the above. (4) 5. Organisms growing at 39oC are called. a. Psychrophiles b. Mesophiles c. Thermophiles d. Hyperthermophiles
(10) 6. Draw and label the cell envelope for gram negative bacteria. Lipopolysaccharide Outer membrane Periplasm Cell wall Inner membrane
Extra credit (3 points) How are the strands of peptidoglycan linked in gram negative bacteria? Direct peptide bonds between the 3rd and 4th amino acids on two strands.