biochem practice II ANSWERS (1)

47. Which of the following is a sugar? circle 48. A fragment of a DNA molecule has the base sequence TATCGCAACG. What is the complementary sequence?___ATAGCGTTGC_______________________________ 49. DRAW( i.e. write) the tripeptide that GTTTTTGTC codes for. Use 3-letter SYMBOLS to denote amino acids (see hand out for symbols and codon chart) Val Phe Ala 50. Which fatty acid is unsaturated? Circle all that are. a. CH3(CH2)12CO2H b. CH3CH=CHCH2CH=CHCH2CH=CHCO2H c. CH3(CH2)16CH2CH2CO2H d. CH3CH2CH=CHCH2CH2CH2CH2CO2H e. CH3CH=CHCH2CH=CHCO2H 51. Name a functional group found in carbohydrate _______alcohol________________ 52. Which is not a carbohydrate? a. dipeptide b. cellulose c.sucrose d. glucose e. starch 53. Which of the following is held together by peptide bonds ? a. DNA b. RNA c. starch d. cellulose e. protein 54. Which of the following is a fat? circle 55. DNA has a backbone that consists of alternating a. base pairs. b. phosphates and sugars. c. sugars and proteins. d. proteins and bases. e. bases and amino acids 56. Which of the following is an amino acid? circle 1. CH3OCH2NH2 2. 3. True and false ____ Alcohol and amino group are present in all amino acids ____A codon is three amino acid residues in a polypeptide. _____ Starch and cellulose are both easily digested by humans _____ DNA is a polymer ______ The polymer of glucose that is responsible for the rigidity of plants is cellulose ______ A peptide bond is also an amide functional