Louis Pasteur's experiment illustrated that
A) life began by chemical evolution.
B) microbes will grow spontaneously in a nutrient broth that has been sterilized and sealed.
C) only some organisms can form spontaneously in nutrient broth.
D) microbes will not grow in a nutrient broth that has been sterilized unless air is allowed to enter the vessel through an opening.
E) some complex molecules associated with living organisms can be synthesized by heating and cooling a solution of simple molecules and providing an electric spark.
D
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What is one of the end products of photosynthesis?
a. Carbon dioxide b. Oxygen c. Water d. NADPH e. Sunlight
Babies that are at a low birth weight are more likely to have health problems, while women will have difficulty delivering babies with high birth weight. Together, this leads to for babies of average birth weight.
A. stabilizing selection B. directional selection C. artificial selection D. disruptive selection E. sexual selection
Because DNA replication takes place at an extremely rapid rate, a cell must repair breaks in a strand of
DNA up to approximately how many times in an hour? a. ten b. one thousand c. ten thousand d. one hundred thousand e. two million
The conducting tissue found in vascular plants that functions in transportation of materials throughout the plant, but does not lend structural support to the stem is
A. lycophyll. B. sporopollenin. C. xylem. D. phloem. E. endosperm.