Question

of alanine has a pk of 9.87. What is the 153, The amino group charge on that amino group at pH 7.0 145. Which amino acid serves as the first amino acid at the hN terminus of a newly synthesized protein? (B) methionine (A) alanine 9.80. The side chain of that amino acid includes (A) an amine group (C) a carboxylic acid group. (D) an alcohol 154. A certain amino acid has a pl (or pH, isoelectric point) (D) threonine (C) serine Which is the best description of a nucleotide? 146. (A) carbohydrate+ phosphate (B) nitrogenous base + carbohydrate 155. An example of quaternary structure in a protein is nitrogenous base + phosphate + amino acid (C) (A) an a-helix (B) a B-bend (or B-turn). (C) the interaction between two B-pleated sheets in a (D) nitrogenous base + carbohydrate+ phosphate Which base is found in DNA but not in RNA? (A) thymine (C) cytosine The DNA double helix is stabilized by (A) interstrand hydrogen bonding (B) intrastrand base stacking. 147. single polypeptide. (B) uracil the interaction between two subunits in a multisubunit protein. (D) guanine (D) 148. 156. The disruption of protein conformation due to heat, detergent, pH changes, and so forth, changes all except thestructure of the protein. (A) primary (C) tertiary (c) electrosale regau du tothe presence of he (B) secondary (D) quaternary phosphate groups Two of the other answers are correct. (D) This amino acid is classified as 157. Which is a heterocyclic nitrogenous base? (A) adenine (C) asparagine Which would be necessary for an enzyme known as an 149. (B) alanine (D) aspartic acid (B) basic (D) polar (A) acidio. 150. oxidoreductase to function properly? (C) non-polar. (A) ATP 158. A major physical property of the non-transmembrane portion of a membrane-bound protein receptor is best described as (C) biotin Where does protein synthesis occur within the cell? (A) (D) NADH 51. (A) hydrophilic. (C) acidic (B) hydrophobic. (D) basic. the Golgi apparatus (B) the ribosome (D) the nucleus (C) the endoplasmic reticulum 159. Which best describes the peptide bond joining amino acids into proteins? 2. What is the difference between ribose and deoxyribose? Ribose is in the L form whereas deoxyribose is in the D form Ribose has one more oxygen atom than does deoxyribose. (A) (A) amide bond (C) ester bond (B) carbonyl bond (D) glycosidic bond (B) 160. Which would be considered an aromatic amino ació (C) Ribose is a monosaccharide, whereas deoxyribose is (A) threonine (B) tyrosine (D) isoleucine D) Ribose is found in the straight chain structure, whereas deoxyribose is found in the ring form.

Answer 1

NOTE - As it is not mentioned which questions are to be answered, only some of them are given below

145. Methionine

146. Nitrogenous base + Carbohydrate + Phosphate ---- A nucleoSIDE has the same composition except that it does not contain the phosphate

147. Thymine ---- In RNA, instead of thymine, Uracil is present

148. Two of the other answers are correct (i.e., option A and B are correct)

149. Adenine ----- A, G, C, and T are the heterocyclic nitrogenous bases present in DNA