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2.) A researcher adds a purified sample of DNA polymerase to a test

tube containing nucleic acids. The researcher finds that the concentration of nucleic acids decreases over time. In this reaction, the nucleic acid is MOST likely which of the following?

-A.catalyst
-B.reactant
-C.energy
-D.product
-
3.) The leaves of certain plants are covered in a waxy cuticle. When it rains, spherical beads of water form on the surface of the cuticle. Which of the following BEST explains why the water forms beads on the leaves?

-A.strong intramolecular forces within water molecules
-B.weak intramolecular forces within water molecules
-C.strong intermolecular forces between water molecules
-D.weak intermolecular forces between water molecules
-
4.) An aqueous solution at pH 9.0 has how many times more free OH- ions than H+ ions?

-A.2 times
-B.4 times
-C.100 times
-D.10,000 times
-
5.) A researcher hypothesizes that a certain chemical reaction performed by cells is a polymerization reaction. To study this reaction in more detail, she replicates the reaction in a test tube. Which of these results, if true, would MOST likely support her hypothesis?

-A.The concentration of water would increase.
-B.The concentration of water would decrease.
-C.The concentration of reactants would increase.
-D.The concentration of reactants would decrease.

6.) Elemental analysis on an organic compound identifies a ratio of one sulfur atom to every six carbon atoms. Based on this result, which of the following functional groups is MOST likely found in this compound?

-A.amino
-B.carboxyl
-C.hydroxyl
-D.sulfhydryl



7.) Use the passage to answer the question.


Brain Homogenate
To analyze its chemical composition, a researcher placed a rat brain in a test tube with an aqueous solution buffered at physiological pH and homogenized the brain with a motorized blender. The researcher then centrifuged the homogenate at high speed to separate out different fractions. The final sample contained three fractions as shown: 
Use this link below to see the image!
https://s3.amazonaws.com/tn8prev-prd-cn-tn8general/items/2/b6f4473d-f325-4b09-af82-07cbfbe3e330/assets/AP_BIOA_U3_L3_CE_AssessmentPassage.png


The researcher finds that the insoluble liquid fraction consists of covalent non-polar molecules. Based on this result, which property of water MOST likely contributed to the separation of the insoluble liquid fraction from the aqueous phase?

-A.cohesion
-B.density
-C.polarity
-D.specific heat

8.) Use the passage to answer the question.


Brain Homogenate
To analyze its chemical composition, a researcher placed a rat brain in a test tube with an aqueous solution buffered at physiological pH and homogenized the brain with a motorized blender. The researcher then centrifuged the homogenate at high speed to separate out different fractions. The final sample contained three fractions as shown: 
Use this link below to see the image!
https://s3.amazonaws.com/tn8prev-prd-cn-tn8general/items/2/b6f4473d-f325-4b09-af82-07cbfbe3e330/assets/AP_BIOA_U3_L3_CE_AssessmentPassage.png


The researcher identifies several compounds in the aqueous phase. Further analysis indicates that some of these compounds have covalent bonds while others are formed from ionic interactions. Which of these BEST describes the difference between these two classes of compounds?

-A.Electrons are shared between two atoms in covalent bonds, while electrons are transferred between two atoms in ionic bonds.
-B.Electrons are transferred between two atoms in covalent bonds, while electrons are shared between two atoms in ionic bonds.
-C.Protons are shared between two atoms in covalent bonds, while protons are transferred between two atoms in ionic bonds.
-D.Protons are transferred between two atoms in covalent bonds, while protons are shared between two atoms in ionic bonds.

9.) Use the passage to answer the question.


Brain Homogenate
To analyze its chemical composition, a researcher placed a rat brain in a test tube with an aqueous solution buffered at physiological pH and homogenized the brain with a motorized blender. The researcher then centrifuged the homogenate at high speed to separate out different fractions. The final sample contained three fractions as shown: 
Use this link below to see the image!
https://s3.amazonaws.com/tn8prev-prd-cn-tn8general/items/2/b6f4473d-f325-4b09-af82-07cbfbe3e330/assets/AP_BIOA_U3_L3_CE_AssessmentPassage.png


Mass spectrometric analysis of the aqueous phase revealed over 30,000 different organic compounds in solution. Which property of carbon BEST explains how carbon is able to form this large number of different compounds?

-A.Carbon has four valence electrons.
-B.Carbon has six valence electrons.
-C.Carbon is highly electronegative.
-D.Carbon is not electronegative.

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Subject: Biology, Science
2.) A researcher adds a purified sample of DNA polymerase to a test tube containing nucleic acids. The researcher finds that the concentration of
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