The Double Heliz STUDENT HAN NAME DATE 1. In the 1950s when Watson and Crick wer

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The Double Heliz STUDENT HAN NAME DATE 1. In the 1950s when Watson and Crick were working on their model of DNA, many scientists did not think that DNA carried the genetic code. a. What was the other type of molecule that some scientists thought might carry genetic information? b. Why did this other type of molecule seem like a likely candidate 2. What are the chemical components of a DNA nucleotide? a. a phosphate, a sugar, and a nitrogenous base b. a phosphate, a nitrogenous base, and an amino acid C. a nitrogenous base, a sugar, and an amino acid d. a nitrogenous base, ATP, and a sugar 3. The two strands of a DNA molecule are held together by hydrogen bonds between the a. phosphate groups on each strand b. nitrogenous bases on each strand c. bases and the phosphate-sugar backbone d. carbon atoms in the sugars 4. In the diagram below, strands I and Il represent the two complementary strands of a portion of a DNA double helix. The sequence of strand I is indicated below. What is the sequence of strand 1? Strand C-T-A-C Strand II-7-7-7 a. AGCA c. TCGT b. CTAC d. GATG 5. The instructions for the traits of an organism are determined by a. the proportions of A, T, C and G in DNA molecules b. the order of nucleotides in DNA molecules c. the length of DNA molecules d. the way nucleotides are paired in the two strands of a DNA molecule www.Biointeractive.org Published December 2013 Revised June 2016 Page 1 of4

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