1) Which base is not found in RNA? a) Cytosine b) Adenine c) Thymine d) Uracil e) Guanine f) Pyrimidine 2) Which bond forms to link two nucleotides together? a) Peptide b) 1,4 glycosidic c) Phosphodiester d) Ester e) 1,6 glycosidic f) Disulfide bridge 3) What percentage of thymine is found in an organism if 19.9% of it's bases are guanine? a) 19.9 b) 50 c) 0 d) 30.1 e) 10.1 f) 36.2 4) Which of the following is not true of RNA? a) It has four bases b) It is single stranded c) It has the sugar ribose d) Uracil replaces thymine e) There are different types f) It forms a double helix 5) How many hydrogen bonds form between cytosine and guanine in DNA? a) 1 b) 2 c) 3 d) 4 e) 5 f) 6 6) Which bases are purines? a) G & T b) C & G c) A & G d) A & T e) U & T f) U & C 7) DNA can only be synthesised in which direction? a) 3' -> 3' b) 3' -> 5' c) 5' -> 5' d) 5' -> 3' e) Antiparallel f) In any direction 8) Which element is found in DNA but not carbohydrates? a) Nitrogen b) Carbon c) Hydrogen d) Oyygen e) Sulfur f) Iron 9) A complete turn of DNA takes place every how many bases? a) 2 b) 4 c) 6 d) 8 e) 10 f) 12 10) How many molecules of DNA are there in a human egg cell? a) 2 b) 23 c) 46 d) 92 e) 100 f) 123

AS Nucleic acids

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