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Biochemistry Test bank 1Review test
2024 test
- Lipids, nucleotides, monosaccharides, amino acids - Correct Answer What are the four major classes of molecules studied in biochemistry (in monomeric form)?
- Carbohydrates - Correct Answer Polymers of sugars are __________.
- Proteins - Correct Answer Amino acids are the building blocks of _________.
- PH = Pak + log ([A-]/ [HA]) - Correct Answer What is the Henderson- Hasselbalch equation?
- Tries acid (Hall), tries base - Correct Answer [HA] is the _____________ and [A-] is the ____________.
- B) Carbon - Correct Answer Which of the following is the most abundant element in the human body? A) nitrogen B) carbon C) oxygen D) phosphorous E) none of the above
- D) Lipids - Correct Answer Which of the major types of biomolecules is never found in a polymeric form? A) amino acids B) carbohydrates C) nucleotides D) lipids E) none of the above
- B) Polysaccharide: glyosidic bond - Correct Answer Which of the following biopolymers is correctly paired with the bond that forms between the monomers? A) protein: ester bond B) polysaccharide: glyosidic bond C) DNA: phosphate bond D) RNA: phosphate bonded)all of the above E) Polysaccharide: energy storage - Correct Answer Which of the biopolymers is correctly paired with its major function? A) protein: information encoding
B) nucleic acids: energy storage C) lipids: information encoding D) polysaccharide: energy storage E) none of the above A) Nucleic acids - Correct Answer The similarity of one organism to another (for example a bacteria versus a human) is most easily done by comparing which biopolymer? A) nucleic acids B) polysaccharides C) proteins D) lipids E) all of the above
- D) Positive; negative - Correct Answer in a water molecule, hydrogens are partially _____; oxygens are partially _____. A) negative; negative B) negative; positive C) positive; positive D) positive; negative E) none of the above A) Two; one H-bond donor, one H-bond acceptor - Correct Answer At any given moment, a single water molecule participates in _____ strong hydrogen bond(s). The role played by the water molecule is best characterized as _____. A) two ; one H-bond donor, one H-bond acceptor B) two ; two H-bond donor C) two ; two H-bond acceptor D) one; H-bond donor E) one; H-bond acceptor B) The hydrogen bond will typically form between a hydrogen atom and either a nitrogen, sulfur, or oxygen atom - Correct Answer In a hydrogen bond between a water molecule and another biomolecule, _____. A) a hydrogen ion on the water molecule forms an ionic bond with a hydride ion on the other molecule B) the hydrogen bond will typically form between a hydrogen atom and either a nitrogen, sulfur, or oxygen atom C) the partial charge on a hydrogen of the water interacts with the partial charge on a hydrogen of the other molecule D) a hydrogen on the water molecule forms a covalent bond to an oxygen or nitrogen atom on the other molecule E) the hydrogen atom is located between an oxygen atom of the water and a carbon atom of the other molecule
E) all of the above C) There is no increase in attractive forces between nonpolar molecules in an aqueous environment - Correct Answer Which of the following explains the attractive forces between hydrophobic molecules in an aqueous solution? A) in an aqueous environment, London dispersion forces between hydrophobic molecules become stronger B) in an aqueous environment, London dispersion forces between hydrophobic molecules and water become stronger C) since nonpolar molecules do not form hydrogen bonds with hydrogen bonds with water, they can form hydrogen bonds with other nonpolar molecules D) there is no increase in attractive forces between nonpolar molecules in an aqueous environment E) none of the above B) Amphiphilic - Correct Answer A molecule that has both a polar and nonpolar region is called _____________. A) micelle B) amphiphilic C) endergonic D) a membrane E) none of the above C) Palmitic acid, a fatty acid - Correct Answer Which of the following is an example of an amphipathic molecule? A) adenine, a base found in nucleic acids B) glucose, a monosaccharide C) serine, an amino acid D) palmitic acid, a fatty acid E) none of the above A) Micelles - Correct Answer In aqueous solution, globules of up to several thousand amphiphilic molecules arranged with the hydrophilic groups on the surface and the hydrophobic groups buried in the center are called _____. A) micelles B) vacuoles C) liposomes D) bilayers E) none of the above F) All of the above - Correct Answer Which of the following molecules would be prevented from readily crossing a lipid bilayer? A) glucose B) sodium ions C) potassium ions D) water
E) all of the above D) 3.3×10^-10 - Correct Answer In an aqueous solution, if the [OH-] is 3.0×10- 5M, what is the [H+]? A) 7.0×10^- B) 7.0×10^- C) 3.3×10^- D) 3.3×10^- E) none of the above A) Formic acid, pike=3.75 - Correct Answer which of the following would be the strongest acid? A) formic acid, pike=3. B) succinic acid, a diprotic acid with pike=4.21 and 5. C) acetic acid, pike=4. D) ammonium ion, pike=9. E) cannot be determined from the given information E) 4.28 - Correct Answer what is the pH of a solution that contains three parts of acetic acid and one part sodium acetate? The pour acetic acid is 4.76. A) 5. B) 5. C) 4. D) 4. E) cannot be determined from the given information B) H3PO4 - Correct Answer what is the conjugate acid ofH2PO4-? A) HPO4^2- B) H2PO C) H3PO D) PO4^3- E) none of the above A) 0.024 M - Correct Answer Considering a 0.1 M formic acid buffer, what is the concentration of formic acid present in a solution of pH 4.25 if the proof formic acid is 3.75? A) 0.024 M B) 0.033 M C) 0.067 M D) 0.076 M E) none of the above C) H2CO3 <----> HCO3-+ H+ - Correct Answer Which of the following shows the buffer that is found in the blood stream? A) H3PO4 <----> H2PO4^2-+ H+ B) H2PO4- <----> HPO4^2-+ H+
e) none of these choices C) Deprotonated and negatively charged - Correct Answer At a pH above its Pak, the R-group of Asp is ___. a) protonated and neutral b) protonated and positively charged c) deprotonated and neutral d) deprotonated and negatively charged e) none of these choices D) 3 - Correct Answer at pH 3, how many charged groups are present in the Penta peptide Ala-Asp-His-Seer-Lys? a) 1 b) 2 c) 3 d) 4 e) 5
- C0 Cyst - Correct Answer which of the following amino acids has a thiol group in its side chain? a) Seer b) Assn c) Cyst d) Tyr e) Met
- D0 Gin - Correct Answer which of the following amino acids contains a side chain that is polar and uncharged from pH 1-13? a) Phi b) Tyr c) Asp d) Glen e) Ile B) Polar - Correct Answer Based upon its side chain, how is the amino acid Seer classified? a) non-polar b) polar c) positively charged d) negatively charged e) none of these choices C) Alanine - Correct Answer what is the N-terminal residue of the peptide AYSDG? a) glutamic acid b) glycine
c) aspartic acid d) alanine e) none of these choices D) CO2 is converted to bicarbonate and which promotes the deoxy state - Correct Answer How does CO2affect hemoglobin-oxygen binding? A) CO2 binds directly to the oxygen binding site, displacing oxygen and thus promoting the deoxy state B) CO2 displaces BPG, thus promoting the oxy state C) CO2i s converted to bicarbonate and Which promotes the oxy state D) CO2 is converted to bicarbonate and Which promotes the deoxy state E) none of the above
- D0 Glee - Correct Answer which of the 20 standard amino acids is optically inactive? a) Argo b) Pro c) Ile d) Glee e) Cyst B) Thick filaments - Correct Answer In a muscle cell, what is the name for the bundles of myosin tails? A) cytoskeleton B) thick filaments C) intermediate filaments D) thin filaments E) none of the above C) Fe^2+ - Correct Answer the central ion of the home group of hemoglobin is _____. A) Cu+ B) Cu2+ C) Fe2+ D) Fe3+ E) none of the above B) Cooperativity - Correct Answer The idea that binding of one molecule of oxygen to hemoglobin enhances further binding of oxygen to hemoglobin is called _____. A) homologous binding B) cooperativity C) fractional saturation D) allosteric E) none of the above
E) 10^
C) Structural - Correct Answer Keratin is classified as which of the following types of protein? A) Enzyme B) Structural C) Movement D) Defense E) Regulatory D) 3.7 - Correct Answer Given pKavalues of 3.5, 9.0and 3.9 (side chain), what is the pin of aspartic acid? a) 6. b) 6. c) 5. d) 3. e) none of these choices A) NMR spectroscopy - Correct Answer A technique for determining protein structure where the protein is in solution is ___. a) NMR spectroscopy b) X-ray crystallography c) electron crystallography d) mass spectrometry e) none of these choices D) All of the above - Correct Answer which of the following is a physical property of water that results from hydrogen bonding? A) high boiling point relative to molecular weight B) a solid state that is less dense than the liquid state C) high surface tension D) ability to solubilize polar molecules E) all of the above B) 5 - Correct Answer Hydrogen bonds are approximately _____% of the bond strength of covalent C-C or C-H
- Bonds. A) 1 B) 5 C) 20 D) 50 E) 95 C) amine - Correct Answer Which of the following functional groups has two hydrogen bond donors and one hydrogen
- Bond acceptor?
A) alcohol B) ester C) thiol D) amine E) amide D) Dipole-dipole interactions - Correct Answer Hydrogen bonds within liquid water are _________. A) attractions between the protons of the oxygen nuclei B) ion-induced dipole interactions C) dipole-dipole interactions D) attractions between two oxygen atoms E) attractions between the H + and - OH ions of the liquid D) hydrophobic effect - Correct Answer What term is used to describe the exclusion of nonpolar substances from an aqueous
- Solution? A) nonpolar effect B) lipid effect C) hydrophobic effect D) oil droplet effect E) amphiphilic effect E) there is no increase in attractive forces between nonpolar molecules in an aqueous - Correct Answer Which of the following explains the attractive forces between hydrophobic molecules in an
- Aqueous solution? A) in an aqueous environment, London dispersion forces between hydrophobic molecules
- become stronger
- B) in an aqueous environment, London dispersion forces between hydrophobic molecules and
- water become stronger D) since nonpolar molecules do not form hydrogen bonds with hydrogen bonds with water, they
- can form hydrogen bonds with other nonpolar molecules E) there is no increase in attractive forces between nonpolar molecules in an aqueous
- environment F) none of the above A) positive; negative - Correct Answer Considering the energetics of transferring nonpolar molecules from water to a nonpolar
- Solvent, the factor Deltas is generally _____, causing delta to be _____. A) positive; negative B) negative; negative
C) 7.
D) 11
E) 13
- C) 6.82 - Correct Answer 28) If the pike values for phosphoric acid are 2.15, 6.82 and 12.38, at what pH would one observe
- Equal amounts of H 2 PO 4 - and HPO 4 2-? A) 2. B) 4. C) 6. D) 9. E) 12. E) 3.9 - Correct Answer If 1.0 mL of 1.0 M acetic acid (pike = 4.76, K = 1.74 x 10 -5 ) was added to one liter of pure
- Water, what is the resulting pH? A) 1. B) 1. C) 3. D) 3. E) 10. F) H2 PO4 - ; HPO4 2- - Correct Answer If the pike values for phosphoric acid are 2.15, 6.82 and 12.38, _____ would predominate at
- PH 5 while _____ would predominate at pH 10. A) H3 PO4 ; H2 PO4 - B) H3 PO4 ; HPO4 2- C) H3 PO4 ; PO4 3- D) H2 PO4 - ; PO4 3- E) H2 PO4 - ; HPO4 2-
- C) H3 PO4 - Correct Answer what is the conjugate acid of H 2 PO 4 -? A) HPO4 2- B) H2 PO C) H3 PO D) PO4 3- E) none of the above
- ok - Correct Answer look at chap 2 test bank 33 and 34 and type ok F) 34 mills of 0.10 M acetic acid - Correct Answer Which of the following could be used to formulate 100 mills of a 0.10 M acetate buffer
- (Pike=4.76) at pH 5 if you start with 64 mills of 0.10 M sodium acetate? A) 3.6 mills of 1 M Hall B) 3.6 mills of 1 M Nao C) 34 mills of 0.10 M Hall
D) 34 mills of 0.10 M Nao E) 34 mills of 0.10 M acetic acid F) all of the above - Correct Answer Which of the following could be used to formulate 100 mills of a 0.10 M phosphate buffer
- (Pike=6.82) at pH 7.2? A) 2.9 moles of Na2 HPO4 and 7.1 moles of NaHPO B) 10 moles of Na2 HPO4 and 7.1 moles of Nao C) 10 moles of NaHPO4 and 7.1 moles of Hall D) 10 moles of H3 PO4 and 17.1 moles of Nao E) all of the above E) CO2 - Correct Answer Metabolic acidosis often causes increased respiratory rates. What portion of the bloodstream
- Buffer is lost through increased respiration? A) H+ B) HCO3 - C) H2 CO D) CO E) H2O A) 6.82 - Correct Answer What is the resulting pH if 10 mill moles of Hall is added to 1 liter of a 0.1 M phosphate
- Buffer at pH 7.00 (pike=6.82)? A) 6. B) 6. C) 7. D) 7. E) cannot be determined B) H2 PO4 - - Correct Answer During vigorous exercise, hydrogen ions are produced within cells as a result of increased
- Metabolism. What component of the intracellular buffer would increase as a result of the
- Increased H + production? A) H3 PO B) H2 PO4 - C) HPO4 2- D) PO4 3- E) none of the above
- b) Amine - Correct Answer When a peptide bond forms, a (n) ___ reacts with a carboxylate group. a) amide b) amine c) alcohol
- c) Lys - Correct Answer Which of the following amino acids has a positively charged side chain at pH 7.4? a) Glue b) Ala c) Lys d) Leo e) His
- c) Cyst - Correct Answer Which of the following amino acids has a thiol group in its side chain? a) Seer b) Assn c) Cyst d) Tyr e) Met
- b) Val - Correct Answer Which of the following amino acids has a nonpolar side chain? a) Seer b) Val c) Lys d) Assn e) none of these choices
- d) Glen - Correct Answer Which of the following amino acids contains a side chain that is polar and uncharged from
- PH 1-13? a) Phi b) Tyr c) Asp d) Glen e) Ile
- b) 3 - Correct Answer At pH ___, the Penta peptide Ala-Glue-His-Val-Cyst would contain two positively charged
- Groups and one negatively charged group. a) 1 b) 3 c) 5 d) 7 e) 9 f) Cyst - Correct Answer Disulfide bonds form between two residues of which amino acid? a) Met b) Seer
c) Assn d) Thru e) Cyst
- b) Polar - Correct Answer Based upon its side chain, how is the amino acid Seer classified? a) non-polar b) polar c) positively charged d) negatively charged e) none of these choices
- c) 2 - Correct Answer At physiological pH, all amino acids have at least ___ charged groups. a) 0 b) 1 c) 2 d) 3 e) cannot be determined
- d) Loss of water - Correct Answer 18) the formation of a dipeptide from two amino acids requires ___. a) reduction of the -carboxyl group b) protonation of the -amine group c) interaction of the two side-chains d) loss of water e) none of these choices
- b) -3 - Correct Answer What is the net charge of the Penta peptide Ala-Cyst- Seer-Glue-Assn at pH 7? a) - b) - c) 0 d) + e) none of these choices a) Primary - Correct Answer What level of protein structure is characterized by the amino acid sequence? a) primary b) secondary c) tertiary d) quaternary e) none of these choices b) tertiary - Correct Answer What level of protein structure is characterized by the three dimensional structure of an
- b) Hydrogen bonds - Correct Answer the predominant non-covalent interaction seen in alpha-helices and beta-sheets is ___. a) electrostatic interactions b) hydrogen bonds c) dipole-dipole interactions d) hydrophobic interactions e) all of these choices
- d) Pro - Correct Answer Which of the following amino acids is generally absent from an alpha-helix? a) Tarp b) Seer c) Ile d) Pro e) none of these choices
- b) Secondary - Correct Answer alpha-helices and beta-sheets comprise ___ structure. a) primary b) secondary c) tertiary d) quaternary e) none of these choices
- c) Highly extended - Correct Answer Which of the following best describes the peptide backbone in a beta-sheet? a) coiled b) compacted c) highly extended d) rigid e) none of these choices
- c) 5 - Correct Answer If an alpha-helical region of a protein contained 18 amino acid residues, how many helical turns
- Would be present? a) 3. b) 4 c) 5 d) 6 e) none of these choices
- ok - Correct Answer look at 32 and 33 chap 4 test bank and type ok a) Glue - Correct Answer Lysine can form a salt bridge by interacting with the side chain of ___. a) Glue
b) Glee c) Assn d) Seer e) Pro b) His; hydrogen bond - Correct Answer the side chain of serine could interact with the side chain of ___ using a (n) ___. a) Val; hydrophobic interaction b) His; hydrogen bond c) Glen; hydrophobic interaction d) Assn; electrostatic interaction e) none of these choices c) Leo; Seer - Correct Answer For a globular protein that is found in the cytosol, ___ would most likely be found in the
- Proteins interior while ___ would most likely be found on the surface. a) Val; Phi b) Leo; Ile c) Leo; Seer d) Thru; His e) none of these choices
- b) Hydrophobic interactions - Correct Answer Which of the following is most critical for maintaining the tertiary structure of a protein? a) hydrogen bonds b) hydrophobic interactions c) disulfide bonds d) salt bridges e) none of these choices
- b) Tertiary structure - Correct Answer Molecular chaperones assist proteins in the formation of ___. a) aggregates b) tertiary structure c) peptide bonds d) primary structure e) none of these choices a) Seer - Correct Answer The amino acid ___ is commonly phosphorylated. a) Seer b) Asp c) Assn d) His e) none of these choices
