Lehninger Principles of Biochemistry 7th Edition Study guides, Class notes & Summaries

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1. Which of the following statements about the fixation of atmospheric nitrogen (N2) into NH3 by living cells is false? A) It involves the transfer of eight electrons per mol of N2. B) It occurs in certain microorganisms, but not in humans. C) It requires a source of electrons, normally ferredoxin. D) It requires one ATP per mol of N2 fixed. E) It requires two key protein components, each containing iron. D 2. Which of the following is not true about the anammox reaction? A) An...

1. The most precise modern definition of a gene is a segment of genetic material that: A) codes for one polypeptide. B) codes for one polypeptide or RNA product. C) determines one phenotype. D) determines one trait. E) that codes for one protein. B. codes for one polypeptide or RNA product 2. The DNA in a bacterial (prokaryotic) chromosome is best described as: A) a single circular double-helical molecule. B) a single linear double-helical molecule. C) a single linear single-...

The chirality of an amino acid results from the fact that its α carbon: A) has no net charge. B) is a carboxylic acid. C) is bonded to four different chemical groups. D) is in the L absolute configuration in naturally occurring proteins. E) is symmetric. C) is bonded to four different chemical groups. Of the 20 standard amino acids, only ___________ is not optically active. The reason is that its side chain ___________. A) alanine; is a simple methyl group B) glycine; is a hydrog...

1. Which of the following is not true of the reaction catalyzed by the pyruvate dehydrogenase complex? A) Biotin participates in the decarboxylation. B) Both NAD+ and a flavin nucleotide act as electron carriers. C) The reaction occurs in the mitochondrial matrix. D) The substrate is held by the lipoyl-lysine "swinging arm." E) Two different cofactors containing —SH groups participate. A 2. Which of the below is not required for the oxidative decarboxylation of pyruvate to for...

1. Under which circumstances are amino acids not metabolized via oxidative degradation? A) Starvation B) Plants growing in nutrient-rich soils C) Normal protein turnover D) A diet rich in proteins E) Uncontrolled diabetes B 2. Which of these is not a protease that acts in the small intestine? A) Chymotrypsin B) Elastase C) Enteropeptidase D) Secretin E) Trypsin D 3. In the digestion of protein that occurs in the small intestine, which enzyme is critical in the activ...

1. If the delta G'° of the reaction A --> B is -40 kJ/mol, under standard conditions the reaction: A) is at equilibrium. B) will never reach equilibrium. C) will not occur spontaneously. D) will proceed at a rapid rate. E) will proceed spontaneously from A to B. E For the reaction A --->B, delta G'° = -60 kJ/mol. The reaction is started with 10 mmol of A; no B is initially present. After 24 hours, analysis reveals the presence of 2 mmol of B, 8 mmol of A. Which is the mo...

Which of the following pairs of bonds within a peptide backbone show free rotation around both bonds? A) C = O and N - C B) C = O and N - Cn C) Cα - C and N - Cα D) N - C and Cα - C E) N - Cα and N - C D) N - C and Cα - C Thr and/or Leu residues tend to disrupt an α helix when they occur next to each other in a protein because: A) Steric hindrance occurs between the bulky The side chains B) An amino acid like Thr is highly hydrophobic C) Covalent interactions may occur between th...

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