Unit 3 Target 1: DNA Structure And Function

12 Questions | Total Attempts: 745

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Unit 3 Target 1: DNA Structure And Function


Questions and Answers
  • 1. 
    Which of the following is a nucleotide found in DNA?
    • A. 

      Ribose + phosphate group + thymine

    • B. 

      Ribose + phosphate group + uracil

    • C. 

      deoxyribose + phosphate group + uracil

    • D. 

      Deoxyribose + phosphate group + cytosine

  • 2. 
    In a DNA molecule, what base is paired with cytosine?
    • A. 

      Thymine

    • B. 

      Guanine

    • C. 

      Adenine

    • D. 

      Uracil

  • 3. 
    Because of base pairing in DNA, the percentage of
    • A. 

      Adenine molecules in DNA is about equal to the percentage of guanine molecules.

    • B. 

      Pyrimidines in DNA is about equal to the percentage of purines.

    • C. 

      Purines in DNA is much greater than the percentage of pyrimidines.

    • D. 

      Cytosine molecules in DNA is much greater than the percentage of guanine molecules.

  • 4. 
    Genes are sections of DNA that contain instructions for assembling
    • A. 

      Purines.

    • B. 

      Nucleosomes.

    • C. 

      Proteins.

    • D. 

      Pyrimidines.

  • 5. 
    In eukaryotes, DNA
    • A. 

      Is located in the nucleus.

    • B. 

      Floats freely in the cytoplasm.

    • C. 

      Is located in the ribosomes.

    • D. 

      Is circular.

  • 6. 
    DNA contains the sugar
    • A. 

      Ribose.

    • B. 

      Deoxyribose.

    • C. 

      Glucose.

    • D. 

      Lactose.

  • 7. 
    What combines with sugar and a phosphate group to form a nucleotide?
    • A. 

      Amino acid

    • B. 

      Deoxyribose

    • C. 

      Glycerol

    • D. 

      Nitrogenous base

  • 8. 
    Despite the diversity of nature, most organisms contain the same 4 DNA bases. This table shows the DNA composition of 3 organisms as reported in a classic 1950s experiment.Based on this study, what did scientists conclude about the DNA composition of all organisms? 
    • A. 

      A, G, T, and C occur in equal percentages.

    • B. 

      A and G occur in equal percentages, and T and C occur in equal percentages.

    • C. 

      A and T occur in equal percentages, and G and C occur in equal percentages.

    • D. 

      A and C occur in equal percentages, and T and G occur in equal percentages.

  • 9. 
    Which of the following are Purines?
    • A. 

      Only Adenine

    • B. 

      Only Guanine

    • C. 

      Only Cytosine

    • D. 

      Only Thymine

    • E. 

      Adenine and Cytosine

    • F. 

      Adenine and Guanine

  • 10. 
    Which of the following are Pyrimidines? 
    • A. 

      Only Adenine

    • B. 

      Only Guanine

    • C. 

      Only Cytosin

    • D. 

      Only Thymine

    • E. 

      Cytosine and Thymine

    • F. 

      Cytosine and Guanine

  • 11. 
    The 5' to 3' strand is called the 
    • A. 

      Lagging strand.

    • B. 

      Leading strand.

    • C. 

      Starting strand.

    • D. 

      Replication strand.

  • 12. 
    The 3' to 5' strand is also called the 
    • A. 

      Lagging strand.

    • B. 

      Leading strand.

    • C. 

      Ending strand.

    • D. 

      Replication strand.

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