Multiple Choice Answers for Midterm #2 and BAC Report

Here are the final answers to the multiple choice portion of the second midterm. The original answers I posted contained several mistakes (sorry for the confusion and extra stress) so please compare your answers to these.

Form 1 (Blue Test)

1. b
2. c
3. d
4. a
5. e
6. all answers considered correct (BAC)
7. d
8. d
9. a
10. all answers considered correct (BAC)
11. e
12. a
13. b
14. c
15. d
16. b
17. a
18. a
19. b
20. a
21. e
22. b
23. a
24. e
25. d
26. a
27. e
28. d
29. b
30. c

Form 2 (Pink test)

1. a
2. e
3. b
4. c
5. b
6. c
7. d
8. a
9. e
10 all answers correct (BAC)
11. d
12. e
13. d
14. a
15. all answers correct (BAC)
16. e
17. a
18. b
19. c
20. d
21. b
22. a
23. a
24. b
25. a
26. e
27. b
28. d
29. a
30. d

BAC Report

Thanks to the members of the BAC (Brittany Luker, Isaac Perez, Sarah Qureshi, Brady Douglas, Patrick Thomas, Paulina Ramirez, Jordan Ardoin, Kadie Bowman, Ashlei Taylor, Kim Gorton, James Walls, Jonathan Hickey, Kendall Kennedy, Britney Williams, and Reid Smalley) for the work yesterday afternoon. I think they broke the record for the longest BAC meeting in history. They brought forward a number of questions for discussion.

DENIED

Most of the problems that students had with the questions appeared to arise because they were not answering the question that I asked.

9-pink, 5-blue

The question asks which species is most efficient at converting energy stored in glucose into ATP. The process that does this is cellular respiration. All three of the organisms listed as possible answers conduct aerobic respiration under the conditions described in the question so they are equally efficient at converting glucose into ATP. Thus, the correct answer is E.

13-pink, 8- blue

The question asks which human activities have increased the rate that carbon dioxide is ADDED to the atmosphere. Both burning coal and burning trees increases the rate that carbon dioxide is added to the atmosphere. Cutting down trees decreases the rate that carbon dioxide is removed from the atmosphere. Although it is true that decreasing the rate that carbon is removed from the atmosphere will result in an increase in atmospheric carbon dioxide content over time, this is not what the question asks. Correct answer D

20-pink, 15-blue

Chemiosmosis is the process that adds energy to ATP during both photosynthesis and aerobic respiration. Chemiosmosis is powered by the concentration gradient that is created when hydrogen ions are actively transported from the stroma inside the thylakoid space which occurs during electron flow. The process of chemiosmosis does not result in active transport of hydrogen ions, but depends on it. Correct answer D.

21-pink, 16-blue

This question asks when ATP is produced during LINEAR electron flow. Because the question asks about linear electron flow anything that happens during cyclic electroon flow is irrelevant! The only correct answer that refers to linear flow is B.

22-pink, 17-blue

This question asks about things that occur during the Calvin Cycle. Several students tried to artue that Carbon dioxide combines with RuBP to produce glyceraldehyde phosphate. The actual product produced during this reaction are an unstable 6-carbon intermediate which breaks down to PGA (either of those would have been correct answers if they were choices). Although it is true that glyceraldehyde phosphate is produced several steps down the line in the Calvin Cycle, you can't possibly think that any chemist would ever define the results of a chemical reaction in that way. Correct answer A

26-pink, 21-blue

This questions asks about the net gain of ATP during ALCOHOL FERMENTATION. Alcohol fermentation occurs as part of anaerobic respiration. All of the ATP released during anaerobic respiration comes from glycolysis. NO ATPS ARE PRODUCED BY ALCOHOL FERMENTATION. The only possible answer is E.

BAC recomendations accepted

10-pink, 6-blue

The seeds consumed by sparrows are angiosperms. These seeds are not dispersed by the birds they are consumed by the birds (seed predation). So I think the correct answe chould be D. However, in the book (PG. 625) is discusses seeds as "dispersable stage". While it is true that seeds are dispersable, the adaptations that allow seeds to be dispersed are produced by the fruit. However, I see that this statement could have been misleading and we didn't spend very much time discussing seed dispersal. Thus, all answers to this questions will be graded as correct.

15-pink, 10- blue

The statement in answer (a) is garbled enough that there is no best answer to this question. Thus, all answers will be considered to be correct.