Biology 203 Exam Corrections
- Corrections are due
one week after the exam was returned in
class. (10% late
penalty per day thereafter)
- Corrections are OPTIONAL.
Your grade can only improve, not decrease.
- Corrections are only for questions which you MISSED on the exam.
A maximum of 10-12 questions may be corrected.
- 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.
- Corrections will be graded on the following criteria:
- a) The correct answer must be identified. Incorrect answer = little/no credit for the question.
- 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.
- General format: Re-write the question, followed
by each answer.
- 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
Note: Each choice (A - E) is identified as correct or
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.
- 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
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