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Biol240_clicker questions_answered_2012.pdf

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Department
Biology
Course
BIOL 240
Professor
Josh Neufeld
Semester
Fall

Description
Fundamentals  of  Microbiology  (Biology  240)   Clicker  questions  Topics  1-­‐9  (answered)   Dr.  Josh  D.  Neufeld     Which  of  the  following  is  NOT  a  differentiating  factor  between  Prokaryotic  and   Eukaryotic  organisms?       A)  Eukaryotes  have  their  DNA  enclosed  in  a  specialized  membrane-­‐bound  nucleus.     B)  Eukaryotes  are  always  larger  than  Prokaryotes.*   C)  Prokaryotes  lack  organelles  that  are  present  in  Eukaryotes.   D)  Eukaryotes  are  more  complex  than  Prokaryotes.   E)  Don’t  know.       A  new  form  of  microbial  life  has  been  discovered.  It  uses  light  for  energy  yet  grows   on  acetate  and  organic  acids.  This  organism  is  classified  as  being  a:       A)  Chemoorganoautotroph   B)  Chemolithoheterotroph   C)  Photoautotroph   D)  Photoheterotroph*   E)  Don’t  know.     Which  of  the  following  nutritional  categories  does  not  exist,  as  far  as  we  know?  In   other  words,  which  category  would  be  energetically  unfavourable?     A)  Chemoorganoautotroph*   B)  Chemolithoheterotroph   C)  Photoautotroph   D)  Photoheterotroph   E)  Don’t  know.     Which  of  the  following  is  NOT  an  implication  of  the  endosymbiotic  theory?   A)  Early  cells  engulfed  bacteria,  beginning  as  a  symbiotic  relationship.   B)  A  chemoorganoheterotroph  became  mitochondria.   C)  A  photoautotroph  became  chloroplasts.   D)  Organisms  kept  engulfing  bacteria  to  grow  larger  and  evolved  into  larger  more   complex  organisms.*   E)  All  are  true.     Being  small  confers  certain  advantages  to  microorganisms.  Which  of  the  following   is/are  advantages?   A)  The  rate  of  exchange  of  nutrients  and  water  is  higher  per  unit  volume  due  to  the   high  surface  area  to  volume  ratio.   B)  Faster  growth  rates,  and  consequently,  rates  of  evolution.   C)  Reduced  metabolic  rates.   D)  Both  A  and  B.*   E)  A,  B,  and  C.     Fundamentals  of  Microbiology  (Biology  240)   Clicker  questions  Topics  1-­‐9  (answered)   Dr.  Josh  D.  Neufeld     Which  bacterium  has  the  highest  surface-­‐to-­‐volume  ratio?   A)  Big  sphere   B)  Short  rod   C)  Long  rod  of  equal  diameter   D)  B  and  C*   E)  Need  a  calculator...     Carrier  mediated  transport  exhibits  the  following  characteristics:   A)  no  specificity  for  substrate   B)  saturation,  and  consequently  a  maximum  rate  of  solute  entry*   C)  static  number  of  transporters  regardless  of  environmental  conditions   D)  A  and  C   E)  None  of  the  above.       Which  of  the  following  is/are  not  characteristic(s)  of  the  cytoplasmic  membrane?   A)  anchor  for  proteins   B)  hosts  electron  transport  chain  for  making  ATP   C)  permeability  barrier   D)  fatty  acids  stabilized  by  ionic  interactions  and  hydrogen  bonding*   E)  All  of  the  above.     Which  of  the  following  are  characteristics  of  Gram-­‐positive  bacteria?   A)  A  cell  wall  consisting  of  roughly  10%  peptidoglycan.   B)  Their  cell  walls  commonly  contain  embedded  teichoic  acids.*   C)  A  thick  lipopolysaccharide  (LPS)  layer.   D)  All  of  the  above.   E)  Don’t  know.     Which  of  the  following  are  characteristics  of  Gram-­‐positive  bacteria?   A)  A  cell  wall  consisting  of  roughly  10%  peptidoglycan.   B)  Their  cell  walls  commonly  contain  embedded  teichoic  acids.*   C)  A  thick  lipopolysaccharide  (LPS)  layer.   D)  All  of  the  above.   E)  Don’t  know.     A  new  bacterium  that  Professor  Neufeld  isolated  is  spiral-­‐shaped.  Which  of  the   following  are  logical  conclusion(s)  that  can  be  drawn  based  on  this  observation:     A)  It  would  be  classified  as  having  a  “spirillum”  morphology*   B)  It  would  be  classified  as  having  a  “coccus”  morphology   C)  This  bacterium  likely  twists  itself  into  the  soil  by  spinning  clockwise.   D)  This  bacterium  is  likely  a  good  swimmer  in  viscous/turbulent  fluids.   E)  More  than  one  answer  correct.     Fundamentals  of  Microbiology  (Biology  240)   Clicker  questions  Topics  1-­‐9  (answered)   Dr.  Josh  D.  Neufeld     Cell  walls  of  Archaea  differ  from  the  cell  walls  of  Bacteria  in  which  of  the  following   ways?   A)  Archaeal  cell  walls  do  not  contain  peptidoglycan.   B)  Archaeal  cell  walls  are  lysozyme  sensitive  since  they  have  beta  1,4  linkages,  as   opposed  to  Bacteria  which  have  lysozyme  insensitive  beta  1,3  linkages.   C)  Generally  Archaea  have  no  outer  membrane.     D)  A  and  C.*   E)  All  of  the  above.       Which  of  the  following  statements  concerning  chemotaxis  is/are  true?   i)  chemotaxis  is  movement  of  a  cell  in  response  to  a  light  gradient   ii)  The  chemical  gradient  is  sensed  temporally     iii)  the  cell  will  always  move  up  the  gradient  toward  increasing  conc.   A)  i   B)  ii*   C)  iii   D)  ii,  iii   E)  Don’t  know     Professor  Neufeld  has  prepared  a  culture  medium  with:   -­‐  Glucose  15g  -­‐  Yeast  extract  1g     -­‐  NaCl    5g   -­‐  K2 PO 4 2g     -­‐  Distilled  water  1  L   -­‐  pH  7   This  is  an  example  of:   A)  A  complex  medium*   B)  A  defined  medium   C)  A  defined  complex  medium   D)  A  growth  factor  medium   E)  Don’t  know.     Professor  Neufeld  has  prepared  a  culture  medium  with:   -­‐  Glucose  15g  -­‐  Yeast  extract  1g     -­‐  NaCl    5g   -­‐  K2 PO 4 2g     -­‐  Distilled  water  1  L   -­‐  pH  7   Does  this  medium  contain  growth  factors?   A)  Yes*   B)  No  
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