FUND.OF GEN CHEM CHAP 1-13 W/ACCESS
16th Edition
ISBN: 9781323406038
Author: McMurry
Publisher: PEARSON C
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Chapter 23, Problem 23.55AP
Why are glycerophospholipids, rather than triacylglycerols, found in cell membranes?
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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 23 Solutions
FUND.OF GEN CHEM CHAP 1-13 W/ACCESS
Ch. 23.1 - Use Figure 23.1 to identify the family of lipids...Ch. 23.2 - Prob. 23.2PCh. 23.2 - Prob. 23.3PCh. 23.2 - Prob. 23.4KCPCh. 23.3 - Prob. 23.1CIAPCh. 23.3 - Prob. 23.2CIAPCh. 23.3 - Prob. 23.3CIAPCh. 23.3 - Prob. 23.5PCh. 23.3 - Prob. 23.6PCh. 23.3 - Prob. 23.7KCP
Ch. 23.4 - Prob. 23.8PCh. 23.4 - Prob. 23.9PCh. 23.4 - Prob. 23.10PCh. 23.4 - Prob. 23.11PCh. 23.5 - Prob. 23.12PCh. 23.5 - Draw the structure of the sphingomyelin that...Ch. 23.5 - Draw the structure of the glycerophospholipid that...Ch. 23.5 - Prob. 23.16PCh. 23.7 - Prob. 23.17KCPCh. 23.7 - Prob. 23.4CIAPCh. 23.7 - Prob. 23.6CIAPCh. 23.7 - Prob. 23.7CIAPCh. 23.7 - Prob. 23.8CIAPCh. 23.7 - Prob. 23.18PCh. 23.7 - Prob. 23.19PCh. 23.7 - Prob. 23.20KCPCh. 23 - The fatty acid composition of three...Ch. 23 - Prob. 23.23UKCCh. 23 - According to the fluid-mosaic model (Figure 23.7),...Ch. 23 - Dipalmitoylphosphatidylcholine (DPPC) is a...Ch. 23 - Prob. 23.26APCh. 23 - Prob. 23.27APCh. 23 - Prob. 23.28APCh. 23 - Prob. 23.29APCh. 23 - Differentiate between saturated, monounsaturated,...Ch. 23 - Are the carboncarbon double bonds in naturally...Ch. 23 - Prob. 23.32APCh. 23 - Prob. 23.33APCh. 23 - Which of these fatty acids has the lower melting...Ch. 23 - Which of these fatty acids has the higher melting...Ch. 23 - Prob. 23.36APCh. 23 - Prob. 23.37APCh. 23 - Prob. 23.38APCh. 23 - Prob. 23.39APCh. 23 - What function does a wax serve in a plant or...Ch. 23 - Prob. 23.41APCh. 23 - Prob. 23.42APCh. 23 - What kind of lipid is spermacetia fat, a wax, or a...Ch. 23 - Prob. 23.44APCh. 23 - Prob. 23.45APCh. 23 - Prob. 23.46APCh. 23 - Prob. 23.47APCh. 23 - Prob. 23.48APCh. 23 - Prob. 23.50APCh. 23 - Prob. 23.52APCh. 23 - Prob. 23.53APCh. 23 - Describe the difference between a triacylglycerol...Ch. 23 - Why are glycerophospholipids, rather than...Ch. 23 - Prob. 23.56APCh. 23 - Prob. 23.57APCh. 23 - Why are glycerophospholipids more soluble in water...Ch. 23 - Prob. 23.59APCh. 23 - Prob. 23.60APCh. 23 - Prob. 23.61APCh. 23 - Draw the structure of a glycerophospholipid that...Ch. 23 - Prob. 23.63APCh. 23 - What is a major function of cholesterol in your...Ch. 23 - Prob. 23.65APCh. 23 - Prob. 23.66APCh. 23 - Prob. 23.67APCh. 23 - Explain how a micelle differs from a membrane...Ch. 23 - Prob. 23.69APCh. 23 - Prob. 23.70APCh. 23 - Prob. 23.71APCh. 23 - Prob. 23.72APCh. 23 - Prob. 23.73APCh. 23 - Prob. 23.74APCh. 23 - Prob. 23.75APCh. 23 - Draw the structure of a triacylglycerol made from...Ch. 23 - Prob. 23.79CPCh. 23 - Prob. 23.80CPCh. 23 - Explain why cholesterol is not saponifiable.Ch. 23 - Draw cholesterol acetate. Is this molecule...Ch. 23 - Prob. 23.83CPCh. 23 - Prob. 23.84CPCh. 23 - Prob. 23.85CPCh. 23 - Prob. 23.86CPCh. 23 - Prob. 23.88GP
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