8. Which compound can be cleaved in half to generate a molecule important in vis

Question

8. Which compound can be cleaved in half to generate a molecule important in vision? A) calcitol B) beta-carotene C) arachidonic acid D) tocopherol E) isoprene 9. Which feature allows certain lipid molecules to be used as colorful pigments in plants and animals? A) Their high oxygen content helps electrons circulate, which allows absorption of visible light. B) Their conjugated bond structures allow absorption of visible light. C) Their four-fused ring structure allows visible light reflection. D) Their hydrophobicity bends light around them E) Their low specific gravities cause light to reflect from their surfaces. 10. What is the effect of a double bond on fatty acid structure?

Explanation / Answer

8. Beta carotene, the most common carotene found in plants, is cleaved in half by the intestinal enzyme beta, beta – carotene, 15, 15’- monoxygenase to two molecules of the fat soluble vitamin, vitamin A that is important in vision. So, the correct option is option B, beta-carotene.
9. Lipid molecules that are used as colorful pigments in plants and animals have a system of conjugated double bonds that allows them to absorb light in the visible region. So, the correct option is option B, their conjugated bond structures allow absorption of visible light.
10. Fatty acids with double bonds in their structure are known as unsaturated fatty acids. The presence of a double bond in the structure of a fatty acid gives them a bent structure that is important in the formation of a phospholipid bilayer of the cell membrane. Unsaturation gives fluidity to the fatty acids and unsaturated fatty acids tend to be liquid at room temperature.

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