BSC 2010- Exam3 (50 points total); 10/03/03
Name________KEY_________________ Social Security#_____________________
Honor Code Pledge- In taking this exam I have adhered to the Academic Honor Code of
Florida State University.
____________________________(your signature)
On the back of the last page of the exam list any
questions on this exam which you feel were ambiguous,
unclear or unfair and why.
Instructions. Insert the
following information in the
box in the upper left had corner
of the test form (see figure at
right): Instructor- Ellington,
Course- BSC 2010, Section01, form- exam # 3B, Date –
10/17. In the space marked
“print last name first” write
your name in block letters (last
name then “space” first name)
and bubble the appropriate
letter in using a # 2 pencil. In
the “special coding section”,
B
PRINT A LARGE “ ”.
Put your social security
number in the
“identification no.” space
and bubble numbers
below. Failure to follow the
above directions may lead to
you getting no credit for the
exam.
1
The exam consists of 25 multiple choice questions (answer sheet numbers 1-25) worth 2 pts
each. You are to choose the most correct answer and bubble the corresponding letter in the
answer sheet. The question will be marked wrong if you have more that one choice
bubbled. If you erase an answer, make sure that you remove all marks. BEST OF LUCK ON
THIS EXAM!
1. In catabolic pathways of cellular energy metabolism (like glycolysis and the Krebs
cycle) which of the following is NOT TRUE- (A) molecules are broken down into smaller
components, (B) entropy is increased, (C) the overall DG for the pathway is positive, (D)
oxidation-reduction [redox] reactions are involved or (E) none of the above.
2. The ultimate source of electrons for non-cyclic photophosphorylation in photosynthesis is
_________ . (A) CO2 breakdown, (B) oxygen, (C) FADH2, (D) water breakdown or (E) ATP
3. Acetyl CoA has _____ carbon(s) while pyruvate has _____ carbon(s). (A) 1, 2
2,2
(B) 3, 2 (C)
(D) 3,6 or (E) 2, 3.
4. ATP synthase molecules in mitochondria and chloroplasts couple the downhill movement of
_____ through a membrane system to the endergonic process of synthesis of __________.
(A) sodium, NADH, (B) glucose, ATP, (C) protons, ATP, (D) water, ATP or (E) protons,
NADH
5. Substrate level phosphorylations occur- (A) in glycolysis but not glycogenolysis, (B) in
glycolysis but not the Krebs cycle, (C) in both glycolysis and the Krebs cycle, (D) in the
Krebs cycle but not in glycolysis or (E) none of the above.
For questions 6 and 7 consider the lactate dehydrogenase reaction:
pyruvate + NADH + H à lactate + NAD+
6. We can say that during the conversion of pyruvate to lactate, pyruvate ___________. – (A)
has been oxidized, (B) has been reduced, (C) is the reducing agent, (D) is neither oxidized
nor reduced or (E) none of the above.
7. In animals, the above reaction _______ (A) occurs under anaerobic conditions, (B) involves
oxidation-reduction, (C) is vital to the oxidative phase of glycolysis [in the absence of
oxygen], (D) all of the above or (E) none of the above.
8. Which of the following is (are) product(s) of the Krebs cycle that transfer electrons to the
electron transport chain- (A) NADP+, (B) NADH and FADH2, (C) FAD+ and
ATP, (D) GTP and NADH or (E) UTP and ATP.
9. The movement of an electron from a more electronegative molecule to a less
electronegative molecule – (A) is endergonic, (B) has a + DG, (C) is non-spontaneous,
(D) all of the above or (E) none of the above.
10. For every turn of the Krebs cycle _____ CO2 molecule(s) is (are) released and
______molecule(s) of FADH2 is(are) produced.- (A) 0, 2, (B) 1,1, (C) 2,0, (D) 2,1, (E) 2,2
2
11. In the electron transport chain the oxidation of NADH produces one more ATP than
FADH2 oxidation because- (A) the DG for NADH oxidation to water is more negative than
the DG for FADH2 oxidation to water, (B) NADH transfers its electrons at the beginning of
the electron transport chain, (C) during NADH oxidation three H+’s are transported into
the intermembrane space while only two are transported when FADH2 is oxidized, (D) all
of the above or (E) none of the above.
12. Which is(are) required for the dark reactions of photosynthesis to take place?- (A) CO2,
(B) ATP, (C) NADPH, (D) all of the above or (E) none of the above.
13. The net ATP production (per unit hexose [6 carbon sugar like glucose] degraded) of
glyogenolysis is higher than that of glycolysis because- (A) there is one more oxidative
step in glycogenolysis, (B) there is one more ATP yielding reaction in glycogenolysis,
(C) pyruvate is not produced in glycogenolysis, (D) there is one less activation or
“investment” reaction step in glycogenolysis or (E) there are no activation or
“investment” reaction steps in glycogenolysis.
14. One of the major products of the triose phosphate dehydrogenase (also known as the
3-glyceraldehyde phosphate dehydrogenase) reaction in the oxidative step [phase] of
glycolysis is_____.(A) ATP, (B) NAD+, (C) glucose-6-P, (D) ADP or (E) NADH.
15. In the complete oxidative catabolism of glucose yielding water and carbon dioxide,
where do the electrons ultimately end up ? (that is, the last step in electron transport
chain produces what?) (A) NADH, (B) FADH2, (C) pyruvate, (D) lactate or (E) water
16. Which of the following does NOT occur during the light reactions of photosynthesis(A) NADP+ reduction to NADPH, (B) production of oxygen, (C) phosphorylation of ADP,
(D) absorption of light or (E) CO2 fixation.
17. The pyruvate dehydrogenase reaction _______. (A) takes place in mitochondria, (B)
produces carbon dioxide, (C) produces acetyl-CoA, (D) produces NADH or (E) all of the
above.
18. The role of Rubisco (RuBP carboxylase) is to (A) phosphorylate a five carbon sugar, (B)
split water into oxygen, (C) use NADPH, (D) attach CO2 onto a five carbon sugar or (E)
none of the above.
19. Photosystems I and II _________. (A) are the light harvesting units of the thylakoids, (B)
are located ONLY in the plant mitochondria, (C) absorb all wavelengths of light, (D) are
the sites of CO2 fixation or (E) are present in the stroma ONLY.
20. The stage of photosynthesis that actually produces sugar is called ______. (A) “Z”
scheme, (B) cyclic photophosphorylation, (C) glycogen synthesis, (D) Calvin cycle or (E)
non-cyclic photophosphorylation.
21. Which of the following is(are) true about primary electron acceptors in chloroplasts? (A)
are proteins, (B) receive electrons from chlorophyll, (C) are part of both non-cyclic and
cyclic electron flow, (D) participate in the light reactions of photosynthesis or (E) all of the
above.
3
22. Where are protons are pumped during electron transport in chloroplasts? (A) cytosol,
(B) matrix, (C) intermembrane space, (D) thylakoid space or (E) nucleus.
23. The process in which light causes an electron to jump to a higher shell is called- (A)
water hydrolysis, (B) photophosphorylation, (C) fluorescence, (D) photobleaching or (E)
photoexcitation.
24. The pyruvate kinase reaction (PEP + ADP à pyruvate + ATP) ________ . (A) is a good
example of an endergonic reaction, (B) has a positive DG, (C) usually occurs in the
cytosol, (D) usually occurs in the mitochondrion or (E) none of the above. (Hint: pyruvate
kinase occurs in the energy yielding phase of glycolysis/glycogenolysis).
25. Which of the following is(are) true about the Calvin Cycle? (A) produces oxygen as a byproduct, (B) requires more NADPH than ATP for glucose synthesis, (C) requires an
equal amount of NADPH and ATP for glucose synthesis, (D) requires three complete
turns of the cycle to make a glucose molecule or (E) none of the above.
Please check to see if you have filled out the
bubble sheet completely (and correctly)
4