Butter, which is made from milk fat, tends to be harder at room temperature than most margarines. If you wanted to make a butter that is softer at room temperature, you should consider:
A) adding more than three fatty acid chains to the triglycerides.
B) saturating the fatty acid chains.
C) making the fatty acid chains longer.
D) making fatty acid chains with fewer kinks.
E) creating more double bonds in the fatty acid chains.
Answer: E
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The migratory patterns of many animals encourage ____
a. a bottleneck b. mutation c. a founder effect d. gene flow e. genetic drift
What are the structures labeled “C” in the accompanying figure?
a. plasmodesmata b. basement membranes c. tight junctions d. gap junctions e. adhering junctions
Feeding levels in an ecosystem are also known as ____
a. nutritional levels b. nourishment levels c. trophic levels d. niche levels e. biome levels
The courtship rituals of many related animals are highly species-specific and prevent the related species from mating. This is an example of
A. habitat preference. B. ecological isolation. C. seasonal isolation. D. behavioral isolation.