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100 Biochemistry Exam 1 Questions with correct answers

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100 Biochemistry Exam 1 Questions with correct answers Which of the following is found in RNA but not DNA A) Uracil B) Guanine C) Deoxyribose D) Phosphate E) Adenine >>>>Uracil Which of the following amino acids exhibits significant ultraviolet absorption above 250 nm? A) Alanine B) Tyrosine C) Methonine D) Glycine E) All of the above >>>>Tyrosine Collagen fibers have a high content of which amino acids? A) histidine, tyrosine, and proline B) proline, hydroxyproline, and tyrosine C) Alanine, phenalanine, and isoleucine D) Cysteine, Methionine, and Phenalenine E) Glycine, proline, and hydroxyproline >>>>glycine, proline and hydroxylproline At neutral pH (7) A) the carboxyl group exists as -COOH, and the amino group exists as -NH3+ B) the carboxyl group exists as -COO-, and the amino group exists as -NH3+ C) the carboxyl group exists as -COO-, and the amino group exists as -NH2- D) the carboxyl group exists as -COOH, and the amino group exists as -NH2- E) None of the above >>>>the carboxyl group exists as -COO-, and the amino group exists as -NH3+ The basic structural unit of collagen, tropocollagen, has the following structure: A) triple stranded extended helix B) Beta-pleated sheet C) Right handed alpha-helix D) Left handed alpha helix E) A mix of alpha helicies and beta pleated sheets >>>>triple stranded helix Which of the following amino acids has the largest tendency to destabilize alpha helicies? A) Arginine B) Proline C) Tyrosine D) Serine E) Histidine >>>>proline In a DNA double helix, the two DNA chains are held together by: A) Covalent bonds between the pair of bases B) Hydrogen bonds between the pair of bases C) Ionic bonds D) Osmotic Interactions E) None of the aboce >>>>Hydrogen Bonds In DNA, guanine pairs with A) Adenine B) Cytosine C) Thymine D) Guanine E) Uracil >>>>Cytosine Which of the following amino acids are neutral and polar at pH=7 A) Tyrosine B) Serine C) Asparagine D) Threonine E) All of the above >>>>all of the above The partial double bond character of the peptide bond: A) restricts rotation around the C-N bond B) Allows rotation around the C-N bond C) Restricts rotation around the Ca-C bond D) Restricts rotation around the Ca-N bond E) allows free rotation around C-N and C-C bonds >>>>restricts rotation around the C-N bond Which of the following amino acids has a sulfur atom A) lecuine, serine B) methionine, cysteine C) aparagine, glutamine D) arginine, lysine E) tyrosine, phenylalanine >>>>B) methionine, cysteine Which of the following is true about buffer systems? A) they are typically made up of a strong acid and strong base mixed together B) The pH will vary greatly in the region of the titration curve where [HA]=[A-] C) They will have an area on their titration curve where the greatest buffering capacity exists D) They will vary greatly in pH as acid or base is added

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