Lehninger Principles of Biochemistry 7th Edition

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...

Lehninger Principles of Biochemistry 7th Edition by Nelson Test Bank. When a region of DNA must be repaired by removing and replacing some of the nucleotides, what ensures that the new nucleotides are in the correct sequence? A) DNA cannot be repaired and this explains why mutations occur. B) Specific enzymes bind the correct nucleotides. C) The new nucleotides base pair accurately with those on the complementary strand. D) The repair enzyme recognizes the removed nucleotide and brings in a...

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...

Test Bank for Lehninger Principles of Biochemistry, 7th Edition by David L. Nelson Table of Contents 1. The Foundations of Biochemistry 2. Water 3. Amino Acids, Peptides, and Proteins 4. The Three-Dimensional Structure of Proteins 5. Protein Function 6. Enzymes 7. Carbohydrates and Glycobiology 8. Nucleotides and Nucleic Acids 9. DNA-Based Information Technologies 10. Lipids 11. Biological Membranes and Transport 12. Biosignaling 13. Bioenergetics and Biochemical Reaction Types 14. Glycolysis, G...

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-...

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...

Lehninger Principles of Biochemistry 7th Edition