CHE 202-113 Exam 1 Feb 14, Spring 201 12) In addition to an amine, which functio
ID: 565601 • Letter: C
Question
CHE 202-113 Exam 1 Feb 14, Spring 201 12) In addition to an amine, which functional group do all amino acids contain? 12) A) an oxyacid Ca carbexylic acid B) an amide D) an alcohol 13) Which is an amino acid nonpolar neutral side chain? 13)_ B) -CH2OH 14) How many peptide bonds are present in the polypeptide shown below? 14) CH3 CH2CH B) two C) three D) four A) one 15) 15) Which structures represent the same dibromobenzene compound? Br Br B) II and III D) All structures are identical. A) L IL, and 111 16) 16) The attractive force between the cylic amine bases in DNA is A) disulfide bridges C) ionic interactions of salt bridges B) hydrogen bonding. D) hydrophobic stacking 7) What is the backbone of the nucleic acid constructed of? 17) 1 A) glucose polymers C) amine bases B) polyamides D) alternating sugar phosphate groups 18) lodine, las), is more soluble in dichloromethane, CH2Cl2(n, than in water because 18) A) the dipole-dipole forces in dichloromethane are much stronger than the dispersion forces in iodine. B) iodine is polar and dichloromethane has a large number of hydrogen bonds. D) the intermolecular forces are similar in both iodine and dichloromethane. C) both iodine and dichloromethane have strong ion-dipole interactionsExplanation / Answer
12: Generally all amoni acid contains an amino and a carboxylic functional group. Hence, answer is (C)
13: Out of the four given functional group, only -CH3 is non-polar. Hence, answer is (A).
14: Three peptide bonds are present in the polypeptide given. The peptide bond is the bond connecting the C=O and N-H group.
15: (B) is the answer. Here, both (II) and (III) are o-dibromobenzene.