1. Which of the following amino acids has an aromatic side chain? a. Arg b. Tyr
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Question
1. Which of the following amino acids has an aromatic side chain? a. Arg b. Tyr c. Phe d. a and b e. b and c 2. Which amino acid has a side-chain sulfur bracketed by carbons and is the universal methyl donor? b. cysteine c. theronine d. histidine e. tyrosine 3. The principal intracellular ions and buffer system are a. K. CTand bicarbonate b. Mg Cr and bicarbonate e. K, Mg and phosphate d. K: Ca and phosphate e. Na". CT and bicarbonate a. The entropy of molecules is principally due to translational and rotational freedom. b. A negative change in entropy will contribute to driving a reaction in the forward direction. e. The First Law of Thermodynamics says that the total amount of entropy in the universe is always 4. Which of the following statements about entropy is true? increasing. d. Bond energy is principally a form of entropy e. all of the above 5. H-bonds are a. fixed in length b. non-directional c. the result of London dispersion forces d. as strong as C-H bonds e. weaker than charge-dipole interactions eD 112 103 01 1 1 3@@i@ 123 ® O 104 A) (E) 114() (C) (D) (E) 124 A) (B) 105 ® @i® 115G@i 125(B oa@@@@@l |@ | 151 ®@j 161 B171 @ | 153 E) a@l® 163 g)(B@1731 154 154 8 0 155 165 co 175 156 A) (B) G (0 (E) 166 (D) (E) 176 157 B 167 ees m 158 (A) (03 168Explanation / Answer
Answer 1 :- (e) b and c.
Phenylalanine, tyrosine, and tryptophan contain large rigid aromatic group on the side-chain.
Answer 2 :- (a) Methionine
SAM is the most prolific donor of one carbon groups in biosynthetic reactions. Its formation is catalyzed by methionine adenosyl transferase.
SAM is made from methionine which is an essential amino acid.
Answer 3 :- (e) Na+ , Cl- and bicarbonate
Answer 4 :- (a) The entropy of molecule is principally due to translational and rotational freedom.
Answer 5 :- (c) the result of London dispersion force.
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