Unit 1 Review#1

  1. What is the sugar present in DNA?
  2. If ten percent of the bases in a molecule of DNA are adenine, what is the ratio of adenine to guanine in the same molecule?
  3. Which are the base pairs normally found in DNA?
  4. If a DNA molecule contains 10,000 bases, of which 18% are thymine, what would the number of cytosine molecules be?
  5. If a DNA molecule contains 4000 bases and 1200 of these are adenine (A), what would the percentage of guanine bases be?
  6. A fragment of DNA was found to have 120 guanine bases and 60 adenine bases. What is the total number of sugar molecules in this fragment?
  7. A section of a DNA molecule contains 300 bases. Of these bases, 90 are adenine. How many cytosine bases would this section of DNA contain
  8. Analysis of a genome reveals that it is composed of a double stranded DNA molecule containing 14% T (thymine). Based on this information, what would you predict the %C (cytosine) to be?
  9. If one cell’s DNA has 40% AT, what will be the percentage of Guanine?
  10. Considering the structure of double stranded DNA, what kinds of bonds hold one complementary strand to the other?
  11. The model of DNA used today was proposed by James Watson and Francis Crick in 1953. In this model, what sequence of bases would be complementary to A-G-C-T-A?
  12. Draw and label the three parts of a nucleotide.
  13. What is the name of the chemical bonds in DNA by which the deoxyribose sugar components of adjacent nucleotides are linked to each other through the phosphate groups?
  14. Draw and label the parts of, a DNA molecule, two nucleotides long.
  15. What type of bond connects base pairs in DNA?
  16. A  DNA strand has a 3′ end and 5′ end. How can you distinguish between the two ends?
  17. Describe the form and shape of a DNA molecule
  18. A DNA strand has the sequence A-C-A-G-C-C-G-T-A. What would be its complementary strand?
  19. In nucleic acids, the phosphate group is attached to which carbon of deoxyribose sugar?
  20. With reference to a DNA molecule, what does the term, anti-parallel mean?
  21. Where in a cell is DNA located?
  22. What part of a DNA molecule contains nitrogen?
  23. What components does a nucleotide contain?

Leave a Reply

Report a Glow concern
Cookie policy  Privacy policy