 |
|
|
| 1. |
The sugars and phosphates in the "backbone" of a DNA strand are held together by ________.
[Hint]
|
|
|
|
| 2. |
The two strands of a DNA double helix are held together by ________.
[Hint]
|
|
|
|
| 3. |
Which of the following lists the correct order of events in DNA replication?
[Hint]
|
|
|
|
| 4. |
DNA structure can be described as a twisted ladder. Imagine you are climbing a model of DNA, just as if you were climbing a ladder. What parts of a nucleotide are your feet touching as you climb?
[Hint]
|
|
|
|
| 5. |
Human chromosomes range in size dramatically, with the smallest (chromosome Y) being many times smaller than the largest (chromosome 1). What is responsible for determining the size of a chromosome?
[Hint]
|
|
|
|
| 6. |
Imagine that you are studying a newly discovered bacterium from a hot springs in Yellowstone National Park. When you examine the nucleotide composition of this organism, you find that 10% of the nucleotides in its DNA are adenine. What percentage of nucleotides are guanine? Explain.
[Hint]
|
|
|
|
| 7. |
How can a cell, killed by heat in order to render it harmless, somehow still act to transform a second strain of bacterium from a noninfectious form into a disease carrier (i.e., a pathogen)?
[Hint]
|
|
|
|
| 8. |
Select the pairings of nucleotides determined by Chargaff's investigations.
[Hint]
|
|
|
|
| 9. |
To what does the phrase "ladder-like appearance" refer when considering the structure of DNA?
[Hint]
|
|
|
|
| 10. |
Which of the following events occur within a DNA replication bubble?
[Hint]
|
|
|
|
| 11. |
Which of the following options would result from the actions of DNA polymerase during DNA replication?
[Hint]
|
|
|
|
| 12. |
[Hint]
|
|
|
|
| 13. |
[Hint]
|
|
|
|
| 14. |
[Hint]
|
|
|
|
| 15. |
[Hint]
|
|
|
|
| 16. |
[Hint]
|
|
|
|
| 17. |
[Hint]
|
|
|
|
| 18. |
The four DNA nucleotides are subtly different, yet each is composed of similar subunits. On the diagram below, identify the three parts of a nucleotide.
[Hint]
For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
|
|
|
|
|
|
|
|
|
|
|
|
|
| 19. |
DNA is replicated within the nucleus. Enzymes are required to do this. Label the enzyme needed for each spot indicated on the image below.
[Hint]
For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
|
|
|
|
|
|
|
|
|
|
|
|
|
| 20. |
Chromosomes are made of which of the following molecules?
[Hint]
|
|
|
|
| 21. |
[Hint]
|
|
|
|
| 22. |
[Hint]
|
|
|
|
| 23. |
Why did many scientists have trouble believing that DNA could be the carrier of genetic information?
[Hint]
|
|
|
|
| 24. |
[Hint]
|
|
|
|
| 25. |
How many times is a cell's DNA replicated before it divides?
[Hint]
|
|
|
|
| 26. |
What is the approximate error rate for DNA polymerase?
[Hint]
|
|
|
|
| 27. |
What is the approximate error rate for DNA replication?
[Hint]
|
|
|
|
| 28. |
Which of the following can cause errors to accumulate in DNA?
[Hint]
|
|
|
|
| 29. |
Which of the following can be caused by ultraviolet radiation in sunlight?
[Hint]
|
|
|
|
| 30. |
How many different possible base sequences are there in a
nucleotide chain three nucleotides in length?
|
|
|
|
| 31. |
Because each base pairs with a complementary base, in
every DNA molecule the amount of
|
|
|
|
| 32. |
Semiconservative replication refers to the fact that
|
|
|
|
| 33. |
DNA helicase
|
|
|
|
| 34. |
DNA polymerase
|
|
|
|
| 35. |
Which of the following are incorrectly matched?
|
|
|
|
|
Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
|
| |
|
|
