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PracticeQuestions_05 - 1 Using terms from the list below...

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1. Using terms from the list below, fill in the blanks in the following brief description of the experiment with Streptococcus pneumoniae that identified which biological molecule carries heritable genetic information. Some terms may be used more than once. Cell-free extracts from S-strain cells of S. pneumoniae were fractionated to __________________ DNA, RNA, protein, and other cell components. Each fraction was then mixed with __________________ cells of S. pneumoniae . Its ability to change these into cells with __________________ properties resembling the __________________ cells was tested by injecting the mixture into mice. Only the fraction containing __________________ was able to __________________ the __________________ cells to __________________ (or __________________ ) cells that could kill mice. carbohydrate lipid R-strain DNA nonpathogenic RNA identify pathogenic S-strain label purify transform 2. In a DNA double helix, _____________________. A the two DNA strands are identical B purines pair with purines C thymine pairs with cytosine D the two DNA strands run antiparallel E the nucleotides are ribonucleotides. 3. Which of the following chemical groups is not used to construct a DNA molecule? A five-carbon sugar B phosphate C nitrogen-containing base D six-carbon sugar 4. Which of the following sequences can fully base-pair with itself? A 5 -AAGCCGAA-3 B 5 -AAGCCGTT-3 C 5 -AAGCGCAA-3 D 5 -AAGCGCTT-3
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5. Indicate whether the following statements are true or false. If a statement is false, explain why it is false. A. DNA molecules, like proteins, consist of a single, long polymeric chain that is assembled from small monomeric subunits. B. The polarity of a DNA strand results from the polarity of the nucleotide subunits. C. There are five different nucleotides that become incorporated into a DNA strand. D. Hydrogen bonds between each nucleotide hold individual DNA strands together.
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