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Biology 203 - Microbiology

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Biology 203 Exam Corrections


  1. Corrections are due one week after the exam was returned in class. (10%  late penalty per day thereafter)  
  2. Corrections are OPTIONAL.   Your grade can only improve, not decrease.
  3. Corrections are only for questions which you MISSED on the exam. A maximum of 10-12 questions may be corrected.
  4. Maximum credit is 50% of the # points lost, with a limit of 10-12 questions (30 points) corrected.  E.g. an exam score of 70 means that 30 points  were lost.  Therefore, up to 15 points can be regained, for a maximum score of 85.
  5. Corrections will be graded on the following criteria:      
  6.  a) The correct answer must be identified.  Incorrect answer = little/no credit for the question.
  7.  b) Each choice (A, B, C, D, E) must be explained: why it is true or false.
     c) Explanations must be complete and correct.   (It helps to cite the page# of your textbook)
     d) False/missed explanations = partial credit;   No explanations  = NO CREDIT.
  8. General format:  Re-write the question, followed by each answer.
  9. Hand in your corrections stapled to your original answer sheet (required!!). 

Exam corrections can be done for multiple choice questions, but not for short answer or bonus questions

Special instructions for Exam 3 corrections: Use specific examples (names of microbes) whenever possible to explain or defend an answer!

Sample exam question and the corresponding exam correction: 

1. Bacteria are able to move with the help of:
        A) Pseudopods   B) Cilia   C) Flagella   D) All of the above   E) Capsules

Exam Correction Answer

  1. Bacteria are able to move with the help of:

      A) Pseudopods- This answer is incorrect.  Pseudopods are 'false feet' - a way by which amoebas (eukaryotes) move.  Bacteria usually have a rigid cell wall.
       B) Cilia - This answer is incorrect.   Bacteria do not have cilia.   Cilia are short cellular extensions with microtubules used for movement by Paramecium and other eukaryotes.
       C) Flagella - This answer is correct.  Bacterial flagella consist of the protein flagellin, making them stiff.  They rotate, propelling the cell forward like a corkscrew/propeller.  (Eukaryotes also have flagella, but these are made of microtubules). (page 59)
       D) All of the above - this answer is incorrect.. Eukaryotes can move with all of the above, but bacteria only have flagella.
       E) Capsules - this answer is incorrect.  Capsules are slimy layers that surround some bacteria and serve in attachment and protection, not in movement..(page 58)

Note: Each choice (A - E) is identified as correct or incorrect.   An incorrect choice is explained WITH EXAMPLES as to what it REALLY IS, not simply as "Others have this too".  (Since the answers A, B, D, and E are false, this is obvious).   What I am looking for is an understanding of why these choices are wrong.   Where appropriate, textbook pages are cited.


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