Which of the following properties does soap, an emulsifier, have that make it useful for washing dirt oﬀ one’s handswith water?

Soap’s dual polar and nonpolar nature helps bond oil and water

Soap’s acidity causes grime to precipitate into the water

Soap’s enzymatic action helps to dissolve grime into small particles

Soap’s rough texture physically scours grime oﬀ surfaces

Answer and Explanation

The Correct Answer is A

Soap’s dual polar and nonpolar nature helps bond oil and water. Soap is an emulsifier, which means that it has both polar and nonpolar regions. The polar regions of soap molecules are attracted to water, while the nonpolar regions are attracted to oil and grease. This allows soap to bond with both water and oil, helping to remove dirt and grime from surfaces.

B. Soap’s acidity does not cause grime to precipitate into the water.

C. Soap does not have enzymatic action that helps to dissolve grime into small particles.

D. Soap’s texture does not physically scour grime oﬀ surfaces.

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Correct Answer is B

Explanation

Peptide bonds. Enzymes are proteins, and proteins are made up of amino acid monomers linked together by peptide bonds. A peptide bond is a covalent bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid.

a. Ester bonds are covalent bonds that form between a carboxylic acid and an alcohol.

c. Phosphodiester bonds are covalent bonds that form between a phosphate group and two hydroxyl

groups.

d. Glycosidic bonds are covalent bonds that form between two monosaccharides.

A. A substance with a pH of 3 is two times more alkaline than a substance with a pH of 4. B. A substance with a pH of 3 is 10 times more alkaline than a substance with a pH of 4. C. A substance with a pH of 3 is two times more acidic than a substance with a pH of 4. D. A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4.

Correct Answer is D

Explanation

A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4. The pH scale is a logarithmic scale, which means that each change of one pH unit represents a tenfold change in the hydrogen-ion concentration. A substance with a pH of 3 has a hydrogen-ion concentration that is 10 times greater than that of a substance with a pH of 4.

A. A substance with a pH of 3 is not two times more alkaline than a substance with a pH of 4.

B. A substance with a pH of 3 is not 10 times more alkaline than a substance with a pH of 4.

C. A substance with a pH of 3 is not two times more acidic than a substance with a pH of 4.

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\| 1	\| 5.0 g\| 2.0 sec	\|
\| 2	\| 5.0 g\| 1.0 sec	\|
\| 3	\| 30.0 g\| 0.5 sec	\|
\| 4	\| 35.0 g\| 1.5 sec	\|

Which of the following properties does soap, an emulsifier, have that make it useful for washing dirt oﬀ one’s handswith water?

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Naxlex Comprehensive Predictor Exams

The covalent bonds between the monomers of an enzyme macromolecule are:

Correct Answer is B

Explanation

Which of the following is correct regarding the pH scale?

Correct Answer is D

Explanation

Genetic information describing the characteristics of an organism is found in which of the following?

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Use the table below to answer the question. | Object | Mass | Time of Fall | | | | | | 1 | 5.0 g| 2.0 sec | | 2 | 5.0 g| 1.0 sec | | 3 | 30.0 g| 0.5 sec | | 4 | 35.0 g| 1.5 sec | Which of the following conclusions is supported by the data?

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