Sulfur dioxide is added to "must" in the production of wine to
A) improve the flavor.
B) allow more control over the fermentation process.
C) provide a necessary nutrient for the fermentation process.
D) prevent tannins from leaching out of wood into the fermenting wine.
E) both enhance flavor and promote fermentation.
B
Bloom's Taxonomy: Comprehension
Section: Food Microbiology
Learning Outcome: 25.3
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The two distinct types of neurotransmitter receptors found in postsynaptic membranes are
A. metabotropic and neurotropic. B. ionotropic and gonadotropic. C. gonadotropic and neurotropic. D. neurotropic and isotopic. E. metabotropic and ionotropic.
The individuals responsible for constructing the first model of DNA structure were
a. Wallace and Watson. b. Lamarck and Darwin. c. Mendel and Meischer. d. Crick and Watson.
Which hypothesis asserts that viruses are remnants of cellular organisms and evolved from small cells that were
parasites in larger cells? a. escape hypothesis b. virus-first hypothesis c. regressive hypothesis d. progressive hypothesis e. degenerative hypothesis
Most substances become denser when frozen, but water becomes less dense. As a consequence, ice floats. What is responsible for this unusual property?
A) As the temperature drops and water molecules slow down, there is increasing opportunity for the hydrogen bonds to form. These bonds hold the numerous V-shaped molecules slightly farther apart than when no hydrogen bonds exist, causing the water to be less dense. B) Oxygen is able to covalently bond with additional hydrogen molecules when the temperature drops and molecular motion slows down. Because hydrogen floats, the greater the number of hydrogen atoms bound to an oxygen molecule, the more buoyant it becomes. C) Because covalent bonds are broken by the process of freezing, ice molecules have fewer electrons than water, and so they are less dense and float. D) Most water molecules have some sodium and chloride ions bound to them. Upon freezing, the sodium and chloride ions are lost, making the ice less dense. E) Molecular motion is slower in solid substances than liquids; therefore, more of the molecules can evaporate. As a consequence, when water freezes, it stays in close contact with air.