Miller-type experiments have shown that
A) simple cells can be produced in the laboratory using a "soup" of small organic molecules.
B) complex organic molecules can be produced by physical processes from inorganic components.
C) living cells could survive in primitive Earth's atmosphere.
D) given the conditions of early Earth, the formation of life would still require additional materials from meteorites and asteroids.
Answer: B
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Indicate whether the statement is true or false
What was the perceived fundamental conflict between Darwin's and Mendel's theories?
a. Darwin was a scientist while Mendel was a monk. b. Mendel's experiments were unbiased, while Darwin set out to prove evolution by natural selection. c. Mendel's experiments were based on simple traits while Darwin's evidence was based on complex characteristics. d. Mendel's theory was based on experimentation while Darwin's was based on observation.
Saliva contains salivary __________ an enzyme that begins the chemical digestion of starch.
Fill in the blank(s) with the appropriate word(s).
All of the following statements concerning nitrogen fixation are true EXCEPT which one?
A. The amount of carbon that is taken up by plants and microbes can be dictated by how much nitrogen is available to support growth. B. Nitrogen fixing microbes convert N2 to ammonia. C. The products of nitrogen fixation are incorporated into amino acids and nucleic acids. D. Nitrogen fixation does not affect the rate of carbon flux.