You shake up a bottle of vinegar and oil dressing to mix it each time you use it. The reason you need to do this is that:
A) fat molecules are too large to dissolve in water.
B) vinegar has an acidic pH and is neutralized when mixed with oil.
C) oil is hydrophobic and won't dissolve in vinegar, so the oil and vinegar separate upon standing.
D) vinegar and oil are oppositely charged, and opposites attract.
Answer: C
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Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What is Deirdre's phenotype?
A. Normal B. nn C. Albino D. Cannot be determined
The use of plastic film to wrap meat products can result in increased surface growth of microorganisms in part because of exposure to
A. carbon dioxide. B. water. C. oxygen. D. N2, which comprises approximately 78% of gas in the atmosphere.
Four of the five answers listed below are conditions related to diet. Select the exception
a. colon cancer b. kidney stones c. cardiovascular disorders d. obesity e. Alzheimer's disease
Below is a list of molecules with different chemical characteristics
Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the option below that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest). alanine estrogen propanol sodium (a) alanine > propanol > sodium > estrogen (b) sodium > propanol > alanine > estrogen (c) estrogen > propanol > sodium > alanine (d) estrogen > propanol > alanine > sodium