BIO201C/Hon—Janicke—Spring 2007 If you have not already done so, IMMEDIATELY fill in the
bubbles on the back of the answer sheet for
your name (LAST
(2) 8-digit person number,
(3) seat number
(under “GRADE or EDUCATION”)
On the front of your scantron on the top line, sign your name and the code word
it now, because when the exam is over, you must stop work when told and will be given no extra
time to do ANYTHING.
You will be assigned a score of ZERO if you hand in a scantron with no
name on it, fail to fill in your form number, use notes of any kind, or copy another student’s
Other procedural errors in your scantron or in exam rules (such as hats, calculators of your
own, cell phones heard or seen, or talking) will result in deduction of 5 points (if cheating is NOT
Be sure erasures are complete.
You may ask for a new scantron if you’ve ruined
CHOOSE ONE AND ONLY ONE ANSWER PER QUESTION.
1. We know from lab 4 that in the dark, DCIP (becomes
, does not become
) reduced by water and
does not become
) reduced by chloroplasts. The redox potential of DCIP is
) than that of water and (higher,
) than that of unexcited reaction center
becomes, becomes, higher, higher
does not become, does not become, lower, lower
becomes, does not become, higher, lower
does not become, becomes, lower, lower
does not become, becomes, higher, lower
2.In the presence of light, P680* becomes a strong enough
, oxidizing) agent to donate
electrons to a primary electron acceptor in photosystem II.
Those electrons can be
intercepted by DCIP before they get to photosystem I.
The loss of electrons from P680
leaves an “electron hole” in P680- which is filled by (reduction,
DCMU binds to a site that plastiquinone usually binds on photosystem II.
bound there, electrons (can,
) be passed to photosystem I or to DCIP, and
, decreased) fluorescence occurs.
A. reducing, reduction, can, decreased
reducing, oxidation, cannot, increased
oxidizing, reduction, can, decreased