You are asked to give a classroom demonstration of DNA supercoiling. To do so, you take two different colored pieces of rubber tubing, twist them very tightly and excessively around each other and join the ends of the tubing appropriately. Next, you relieve the supercoiling by breaking one strand and unwinding it. In this demonstration, the breaking and unwinding to relieve the supercoiling simulates the action of
A. ligases.
B. primases.
C. topoisomerases.
D. polymerases.
E. exonucleases.
Answer: C
You might also like to view...
Which of the following is a predicted consequence of kinetochores not achieving the correct level of tension from the mitotic spindle?
A) Sister chromatids will no longer be held together at their centromeres. B) All chromosomes will migrate to one pole instead of to two opposite poles. C) Mitosis will not progress beyond metaphase. D) No prediction can be made.
Which statement describes human sperm or egg cells?
A) They are produced by the process of mitosis. B) They have one copy of each chromosome. C) They have two copies of each chromosome. D) They are genetically identical to all gametes made by a person.
The radioactive isotope 32P labels the T2 phage's _____.
Fill in the blank(s) with the appropriate word(s).
When the energy flow through an ecosystem is measured at each trophic level, ________ of the available energy passes from one level to the next.
A. 1% to 2% B. 5% to 20% C. 25% to 35% D. 36% to 45% E. 46% to 55%