The statement "plants grown from cross-pollinated seeds will grow taller and produce more fruit than plants grown from self-pollinated seeds" is an example of a scientific theory.
A. True
B. False
B. False
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Which of the following are molecular mediators of inflammation?
A) chemokines B) cytokines C) erythrocytes D) both chemokines and cytokines
The oldest of the Eras that make up the geological time scale is the
a. Hadean. b. Paleozoic. c. Mesozoic. d. Cenozoic. e. Jurassic.
Which of the following statements about ecological pyramids is true?
A. A pyramid of organism numbers will always have a large base and a small top. B. The limited number of trophic levels in an ecological pyramid is due to increasing complexity and size of organisms at each greater trophic level. C. Pyramids built upon the biomass of organisms at each level eliminate size as a factor. D. Energy gains between trophic levels occur based upon biomass conversion. E. None of the choices are true.
A key part of DNA's function is to encode information. In considering how information-rich a particular molecule might be, a question is how many different sequences are possible in a particular length of the molecule. In the case of DNA the four
different nucleotides can be arranged in any order. How many different sequences are possible for a DNA strand three nucleotides long? A) 32 B) 3 C) 4 D) 64 E) 16