Which of these would be a valid scientific hypothesis?
A) Human history is determined by a series of supernatural events.
B) Humans should help in the conservation of other animal species.
C) Humans are controlled by forces beyond our understanding.
D) Humans and bacteria share a common genetic code.
D
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A molecular biologist treats a 600-kb length of linear DNA with HindIII restriction endonuclease. Following gel electrophoresis, the biologist observes that there is only one band on the gel corresponding with the migration distance of the 200-kb molecular weight marker. Assuming that no procedural errors were made, what can be concluded from these results?
A. There were no HindIII recognition sequences present in the original DNA. B. Three HindIII recognition sequences were present in the original DNA. C. One HindIII recognition sequence was present in the original DNA. D. Two HindIII recognition sequences were present in the original DNA.
What are the DNA "bonding rules" that allow DNA to maintain its specific structure?
a. A only bonds to T. b. C only bonds to G. c. A only bonds to U. d. Both a and b above.
Sensory receptors convert stimulus energy into
a. resting potentials. b. action potentials. c. activation energy. d. potential energy. e. resting potentials and activation energy only
Pollen of one plant species will not germinate on the flower of another species. This is an example of:
A) hybrid inviability. B) temporal isolation. C) gametic isolation. D) hybrid infertility.