Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:**Question:** Given the following data, which membrane will have the highest Tm (melting temperature)?
1. 20:3
2. 16:1
3. 18:0
4. 14:0
**Options:**
- ○ 3
- ○ 1
- ○ 4
- ○ 2
**Explanation:**
In this context, the numbers represent fatty acid chains with the format X:Y, where X is the number of carbon atoms and Y is the number of double bonds. The Tm (melting temperature) is influenced by the length of the carbon chain and the degree of saturation (double bonds):
- **Longer carbon chains** generally result in a higher Tm because of increased van der Waals forces.
- **More double bonds** (unsaturation) generally result in a lower Tm due to kinks in the fatty acid chain that prevent tight packing.
**Analysis:**
- **20:3:** 20 carbons, 3 double bonds
- **16:1:** 16 carbons, 1 double bond
- **18:0:** 18 carbons, 0 double bonds (fully saturated)
- **14:0:** 14 carbons, 0 double bonds (fully saturated)
The fully saturated 18:0 with the longest chain and no double bonds is expected to have the highest Tm due to optimal packing and strong van der Waals forces.
**Correct Answer:** ○ 3
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