c02-03 AP Bio Practice Quiz

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1. Which of the following are nitrogenous bases of the pyrimidine type? *

نقطة واحدة

ribose and deoxyribose

cytosine and uracil

thymine and guanine

adenine and thymine

guanine and adenine

2. Which of the following is (are) not considered to be a weak molecular interaction? *

نقطة واحدة

an ionic bond in the presence of water

a covalent bond

a hydrogen bond

a van der Waals interaction

both a hydrogen bond and a covalent bond

3. A strong acid like HCl *

نقطة واحدة

both ionizes completely in aqueous solutions and is a strong buffer at low pH.

increases the pH when added to an aqueous solution.

reacts with strong bases to create a buffered solution.

ionizes completely in an aqueous solution.

is a strong buffer at low pH.

4. There are 20 different amino acids. What makes one amino acid different from another? *

نقطة واحدة

different side chains (R groups) attached to an alpha carbon

different side chains (R groups) attached to the amino groups

different side chains (R groups) attached to a carboxyl carbon

different structural and optical isomers

different asymmetric carbons

5. Which level of protein structure do the α helix and the β pleated sheet represent? *

نقطة واحدة

primary, secondary, tertiary, and quaternary

quaternary

secondary

tertiary

primary

6. Which of the following polymers contain nitrogen? *

نقطة واحدة

cellulose

glycogen

starch

amylopectin

chitin

7. Buffers are substances that help resist shifts in pH by *

نقطة واحدة

both donating H+ to a solution when bases are added and accepting H+ when acids are added.

accepting H+ from a solution when acids are added.

releasing OH- to a solution when bases are added.

releasing H+ to a solution when acids are added.

donating H+ to a solution when bases are added.

8. The R group or side chain of the amino acid serine is -CH2-OH. The R group or side chain of the amino acid leucine is -CH2-CH-(CH3)2. Where would you expect to find these amino acids in a globular proteinin aqueous solution? *

نقطة واحدة

Serine would be in the interior, and leucine would be on the exterior of the globular protein.

Leucine would be in the interior, and serine would be on the exterior of the globular protein.

Both serine and leucine would be on the exterior of the globular protein.

Both serine and leucine would be in the interior and on the exterior of the globular protein.

Both serine and leucine would be in the interior of the globular protein.

9. A molecule with the formula C18H36O2 is probably a *

نقطة واحدة

nucleic acid.

hydrocarbon.

fatty acid.

carbohydrate.

protein.

10. How many molecules of water are needed to completely hydrolyze a polymer that is 11 monomers long? *

نقطة واحدة

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