Margarine is made by hydrogenating vegetable oils so that they take on the consistency of butter. Propose a chemical basis for this change from a liquid to a solid
A. Hydrogenation of fats changes them from saturated to unsaturated, which are more solid.
B. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify.
C. Trans fatty acids are changed from saturated to unsaturated, allowing them to solidify.
D. Hydrogenation of fats changes them from unsaturated to saturated, which are more solid.
D
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Leaves appear red in the fall when ____
a. anthocyanin synthesis increases b. chlorophylls are disassembled and recycled to allow other pigments to become more visible c. other pigments, including the orange and yellow accessory pigments, are recycled d. synthesis of other pigments, including the orange and yellow accessory pigments, increases e. the red wavelength range of visible light increases due to changes in Earth's position relative to the sun.
Which hormones play a role in calcium metabolism?
Ferns and mosses are similar because both
A) produce drought-resistant seeds. B) have dominant sporophytes. C) have flagellated sperm. D) have sporophytes that produce diploid spores.
The discovery that ATP is a pain-signaling factor immediately suggested what possible therapeutic approach to alleviate chronic pain?
A. treat with an ATP receptor antagonist B. create large intracellular aggregates of ATP C. block the synthesis of ATP inside cells D. use electric stimulation on pain centers of the brain