Exam1 - BC 368 - Biochemistry of the Cell II 2004 First...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
BC 368 - Biochemistry of the Cell II – 2004 First Exam - ANSWERS MULTIPLE CHOICE: 1. d 2. c 3. b 4. d 5. c 6. c 7. d 8. a 9. d 10. d 11. The nicotine receptors in the smoker have become desensitized. They may be downregulated in one of several ways, such as being made in lower abundance, sequestered, or phosphorylated and inactivated. 12. A) Z = 1, ∆Ψ = -0.065 V because sodium is moving to a negative environment. energy available from one mole of Na + moving into the cell = -14.1 kcal, so 9.66/3.37 = 2.86 moles sodium required to move one mole calcium B) Gramicidin would deplete the sodium gradient, so calcium transport would be less favorable. C) This was a tricky one. Valinomycin will allow potassium out of the cell, which will make ∆Ψ bigger (more negative inside). This would make it more favorable for sodium to enter the cell, but even less favorable for calcium to leave (because of its +2 charge). The result is that the overall process is less favorable. But you also needed to remember that 3 sodium ions are moved for each calcium ion. The final
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/12/2010 for the course BC BC367 taught by Professor Millard during the Spring '10 term at Colby.

Page1 / 2

Exam1 - BC 368 - Biochemistry of the Cell II 2004 First...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online