What compounds were used in Miller and Urey's experiment to simulate the atmosphere of early Earth?
A) Oxygen, ammonia, hydrogen, and methane
B) Ammonia, hydrogen, and carbon dioxide
C) Water, oxygen, ammonia, and methane
D) Water, oxygen, hydrogen, and methane
E) Water, ammonia, hydrogen, and methane
E
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True or False: if an energy source such as sunlight is available, the citric acid cycle can run in reverse in some organisms
A. true B. false
____ is the maintenance of a stable internal environment in the face of a changing external environment
Fill in the blank with the appropriate word.
A hedgehog has 90 chromosomes in their diploid cells. At the end of meiosis II how many chromosomes and sister chromatid are present in each daughter cell?
A. 45 Chromosomes, 0 Chromatids B. 90 Chromosomes, 90 Chromatids C. 45 Chromosomes, 45 Chromatids D. 90 Chromosomes, 0 Chromatids
Which of the following statements is true regarding Drosophila?
A) The ratio of autosomes to fly Y and X chromosomes determines fly sex. B) The Y chromosome plays no role on fly sex determination but does contain genes for fly reproduction. C) The Y chromosome determines male flies. D) The Y chromosome plays no role in fly sex determination or fly reproduction. E) The ratio of X to Y chromosomes determines fly sex.