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Unit 1 Review

Unit 1 Review. AP Biology LCHS. Water's high specific heat is mainly a consequence of the A. small size of the water molecules. B. high specific heat of oxygen and hydrogen atoms. C. absorption and release of heat when hydrogen bonds break and form.

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Unit 1 Review

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  1. Unit 1 Review AP Biology LCHS

  2. Water's high specific heat is mainly a consequence of the A. small size of the water molecules. B. high specific heat of oxygen and hydrogen atoms. C. absorption and release of heat when hydrogen bonds break and form. D. fact that water is a poor heat conductor. E. inability of water to dissipate heat into dry air.

  3. Why does ice float in liquid water? A. The liquid water molecules have more kinetic energy and thus support the ice. B. The ionic bonds between the molecules in ice prevent the ice from sinking. C. Ice always has air bubbles that keep it afloat. D. Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water. E. The crystalline lattice of ice causes it to be denser than liquid water.

  4. One of the buffers that contribute to pH stability in human blood is carbonic acid. Carbonic acid H2CO3 is a weak acid that dissociates into a bicarbonate ion HCO3- and a hydrogen ion. Thus, H2CO3<-> HCO3- + H+ If the pH of the blood drops (becomes more acidic), one would expect A. a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3-. B. the concentration of OH- would increase. C. the concentration of bicarbonate ion (HCO3-) to increase. D. the HCO3- to act as a base and remove excess H+ with the formation of H2CO3. E. the HCO3- to act as an acid and remove excess H+ with the formation of H2CO3

  5. Carbon dioxide (CO2) is readily soluble in water, according to the equation: CO2 + H2O  H2CO3 Carbonic acid (H2CO3) is a weak acid. If CO2 is bubbled into a beaker containing pure, freshly-distilled water, which of the following graphs correctly describes the results? A. B. C. D.

  6. A 100 mL beaker contains 10 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker, 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing? A. The concentration of Na+ ion rises B. The concentration of Cl- falls C. The concentration of undissociated H2O rises D. The pH of the beaker's contents rises. E. The pH of the beaker's contents falls.

  7. Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? 4.0 M 10-10 M 10-4 M 104 M 4%

  8. Organic chemistry is a science based on the study of A. functional groups. B. vital forces interacting with matter. C. carbon compounds. D. water and its interaction with other kinds of molecules. E. inorganic compounds.

  9. Thalidomide and L-dopa are examples of Pharmaceutical drugs that occur as enantiomers, or molecules that A. have identical three-dimensional shapes. B. are mirror images of one another. C. lack an asymmetric carbon. D. differ in the location of their double bonds. E. differ in their electrical charge.

  10. What is the name of the functional group? A. carbonyl B. ketone C. aldehyde D. carboxyl E. hydroxyl

  11. Which of the following is a false statement concerning amino groups? A. They are basic in pH. B. They are found in amino acids. C. They contain nitrogen. D. They are nonpolar. E. They are components of urea.

  12. Amino acids are acids because they always possess which functional group? A. amino B. carbonyl C. carboxyl D. sulfhydryl E. aldehyde

  13. A chemist wishes to make an organic molecule less acidic. Which of the following functional groups should be added to the molecule in order to do so? A. carboxyl B. sulfhydryl C. hydroxyl D. amino E. phosphate

  14. If 2 molecules of the general type were linked together, carbon 1 of one molecule to carbon 4 of the other, the single molecule that would result would be A. maltose. B. fructose. C. glucose. D. galactose. E. sucrose.

  15. Which of the following statements is true regarding the molecule? I. It is a saturated fatty acid. II. A diet rich in this molecule may contribute to atherosclerosis. III. Molecules of this type are usually liquid at room temperature. A. I only D. I and II only B. II only E. I, II, and III C. III only

  16. Polysaccharides, lipids, and proteins are similar in that they A. are synthesized from monomers by the process of hydrolysis. B. are synthesized from monomers by dehydration reactions. C. are synthesized as a result of peptide bond formation between monomers. D. are decomposed into their subunits by dehydration reactions. E. all contain nitrogen in their monomer building blocks.

  17. How many different kinds of polypeptides, each composed of 12 amino acids, could be synthesized using the 20 common amino acids? 412 1220 125 20 2012

  18. What would be an unexpected consequence of changing one amino acid in a protein consisting of 325 amino acids? I. The primary structure of the protein would be changed. II. The tertiary structure of the protein might be changed. III. The biological activity or function of the protein might be altered. A. I only B. II only C. I and III only D. II and III only E. I, II, and III

  19. DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. What would first happen to DNA molecules treated with DNAase? A. The two strands of the double helix would separate. B. The phosphodiester bonds between deoxyribose sugars would be broken. C. The purines would be separated from the deoxyribose sugars. D. The pyrimidines would be separated from the deoxyribose sugars. E. All bases would be separated from the deoxyribose sugars.

  20. Which of the following statements about the 5' end of a polynucleotide strand of DNA is correct? A. The 5' end has a hydroxyl group attached to the number 5 carbon of ribose. B. The 5' end has a phosphate group attached to the number 5 carbon of ribose. C. The 5' end has thymine attached to the number 5 carbon of ribose. D. The 5' end has a carboxyl group attached to the number 5 carbon of ribose. E. The 5' end is the fifth position on one of the nitrogenous bases.

  21. Which molecule has hydrophilic and hydrophobic properties and would be found in plasma membranes? A. 1 B. 5 C. 6 D. 12 E. 14

  22. Which of the following molecules contain(s) an aldehyde type of carbonyl functional group? A. 1 B. 4 C. 8 D. 10 E. 1 and 4

  23. Which molecule is a saturated fatty acid? A. 1 B. 5 C. 6 D. 8 E. 9

  24. Which of the following molecules act as building blocks (monomers) of polypeptides? A. 1, 4, and 6 B. 2, 7, and 8 C. 7, 8, and 13 D. 11, 12, and 13 E. 12, 13, and 15

  25. Which of the following molecules could be joined together by a peptide bond as a result of a dehydration reaction? A. 2 and 3 B. 3 and 7 C. 7 and 8 D. 8 and 9 E. 12 and 13

  26. Which of the following molecules is the pentose sugar found in RNA? A. 1 B. 4 C. 6 D. 12 E. 13

  27. Which of the following molecules consists of a hydrophilic "head" region and a hydrophobic "tail" region? A. 2 B. 5 C. 7 D. 9 E. 11

  28. Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA? A. 5'-purine-pyrimidine-purine-pyrimidine-3' with 3'-purine-pyrimidine-purine-pyrimidine-5' B. 5'-A-G-C-T-3' with 5'-T-C-G-A-3' C. 5'-G-C-G-C-3' with 5'-T-A-T-A-3' D. 5'-A-T-G-C-3' with 5'-G-C-A-T-3'

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