When characterizing DNA gyrase, the Cozzarelli group added a minimal amount of ATP to the reaction tubes containing DNA and gyrase. They did this in order to:
A. confirm that ATP would cause the reaction to reverse and the relaxed DNA would revert to supercoiled form.
B. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 1
C. view the incremental increase of supercoiling of plasmid DNA as gyrase changed the linking number by 2
D. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 1
E. view the incremental relaxation of plasmid DNA as gyrase changed the linking number by 2
C
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Pangea, the name given to the supercontinent that existed before continental drift, was coined by:
a. Sir Francis Bacon. b. Alfred Wegener. c. Harry Hess. d. Edward Suess. e. Sir Alistair Hardy.
A stem cell is a cell that
a. can differentiate into specialized cell types. b. has already differentiated. c. can develop into two or three cell types. d. can only develop into skin cells. e. can only develop into bone cells
The number of new cases of a disease in a population over a specific period of time compared with the healthy population is the ________.
A. epidemic rate B. mortality rate C. incidence rate D. morbidity rate E. prevalence rate
The process of _____________________ transforms solar energy into chemical energy.
a. metabolism b. homeostasis c. respiration d. photosynthesis