After many years of testing, an hypothesis becomes accepted as a
a. problem.
b. theory.
c. conclusion.
d. variable.
e. control.
B
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Where does the carbon in carbon dioxide waste originally come from in cell respiration?
A. Electron Transfer Phosphorylation B. Glycolysis C. The Krebs Cycle D. ATP Breakdown E. None of these
In the early 1950s, James Watson and Francis Crick ____
a. were awarded the Nobel Prize for Medicine or Physiology b. combined all of their previous research in order to explain the structure of DNA c. began to work out the structure of DNA by organizing the information about DNA that was already available d. produced X-ray diffraction photographs from highly purified DNA samples e. isolated two strains of S. pneumoniae and used them to further research the structure of DNA
If you could travel in a time machine back to the Cambrian Explosion, which animals would you expect to see commonly? Check all that apply.
_____ sponges. _____ birds. _____ reptiles. _____ arthropods. _____ flatworms.
Which of the following is a major limiting factor that affects how many steps are in a food chain?
a. food b. habitat c. predators d. energy