FUNDAMENTALS OF BIOCHEMISTRY WPNG 1-SEME
5th Edition
ISBN: 9781119750192
Author: Voet
Publisher: WILEY
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Chapter 20, Problem 5E
Summary Introduction
To identify: The lipoprotein that has a higher density among the given lipoprotein in the question.
Concept introduction: Lipoprotein transports hydrophobic lipid molecules in the water. Single layer of phospholipid and a cholesterol outer shell is present in the lipoprotein. The hydrophilic portions are oriented outward toward the surrounding water and the lipophilic part is oriented inward towards the lipid molecules within the particles.
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At a pH equal to the isoelectric point (pl) of alanine, the net charge of alanine is zero. Two structures can be drawn that have a
net charge of zero, but the predominant form of alanine at its pl is zwitterionic.
CH3
H,N
CH3
**
H¸N-C
H
Zwitterionic
H
Uncharged
OH
Select statements that explain why alanine is predominantly zwitterionic at its pl.
pk of alanine's amino group is more than its pl.
pk of alanine's carboxyl group is more than its pl.
PK of alanine's carboxyl group is less than its pl.
pk of alanine's amino group is less than its pl.
Correct Answer
What fraction of alanine is in the completely uncharged form at its pl?
1 in 2.2 × 107
1 in 1.6 × 10²
1 in 4680
1 in 9460
How does a voltage-gated sodium channel work? Specifically, how and why does a change in voltage trigger their opening? Please be detailed
When sodium ions enter a neuron during depolarization, they trigger the opening of additional voltage-gated sodium channels nearby, creating a positive feedback loop where the influx of sodium ions further depolarizes the membrane, causing even more sodium channels to open and allowing more sodium ions to enter the cell, thus sustaining the depolarization process until the action potential peaks. But how and why exactly does the influx of sodium ions trigger more sodium channels to let in more sodium? Please explain
Chapter 20 Solutions
FUNDAMENTALS OF BIOCHEMISTRY WPNG 1-SEME
Ch. 20 - Prob. 1ECh. 20 - 2. Identify die products generated by the action...Ch. 20 - 3. (a) What is. the charge of bile acids in the...Ch. 20 - 4. Bacteria that live in the large intestine...Ch. 20 - Prob. 5ECh. 20 - 6. Adipocytes store fat in phospholipid-coaled...Ch. 20 - Prob. 7ECh. 20 - Prob. 8ECh. 20 - 9. The first three steps of ? oxidation (Fig....Ch. 20 - Prob. 10E
Ch. 20 - Prob. 11ECh. 20 - Prob. 12ECh. 20 - Prob. 13ECh. 20 - 14. Short chain fatty acids such as butyrate are...Ch. 20 - 15. Why are unsaturated fats preferable to...Ch. 20 - 16. Calculate the ATP yield for the complete...Ch. 20 - 17. Explain why the degradation of odd-chain fatty...Ch. 20 - Prob. 18ECh. 20 - 19. Why is it important that liver cells lack...Ch. 20 - 20. An animal is fed palmitate with a 14C-labeled...Ch. 20 - 21. On what cartoon atoms docs the 14CO2 used to...Ch. 20 - Prob. 22ECh. 20 - 23. Explain why adipocytes need glucose as well as...Ch. 20 - Prob. 24ECh. 20 - 25. Pharmacological inhibition of acetyl-CoA...Ch. 20 - 26. Explain why inhibiting the activity of...Ch. 20 - Prob. 27ECh. 20 - 28. An animal is fed palmitate with a 14C-labeled...Ch. 20 - Prob. 29ECh. 20 - Prob. 30ECh. 20 - Prob. 31CQCh. 20 - Prob. 32CQCh. 20 - 33. Digestion of plant materials generates...Ch. 20 - Prob. 34CQCh. 20 - 35. The tricarboxylate transport system supplies...Ch. 20 - Prob. 36CQCh. 20 - 37. Compare the energy cost, in ATP equivalents,...Ch. 20 - Prob. 38CQCh. 20 - Prob. 39CQCh. 20 - Prob. 40CQCh. 20 - Prob. 41CQCh. 20 - Prob. 42CQCh. 20 - Prob. 43CQCh. 20 - Prob. 1MTE
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