This photo shows early frog embryos, each a product of three mitotic divisions of the nucleus of one fertilized egg. How many nuclei does each of these embryos contain?
1.2
2.4
3.8
4.16
3
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The metabolic diversity of photosynthetic bacteria stems from different
A) bacteriochlorophylls and pigments they contain. B) chlorophylls they can have and organic compounds they can produce. C) light-harvesting complexes, electron donors, and organic compounds they produce. D) unrelated taxa capable of photosynthesis.
Nucleic acid hybridization is the pairing
between a. cDNA and DNA. b. mRNA and cDNA. c. mRNA and DNA. d. mRNA and tRNA. e. DNA or RNA from more than one source
According to IPCC predictions, the effects of climate change will be the most extreme in which of the following areas over the next century?
a) Polar areas b) The tropics c) Deserts at 30o latitude d) Climate change effects will be the same across the globe.
A dental student wants to test if fluoride is an effective additive against tooth decay. The student studies tooth decay in a population of people who live in neighborhoods supplied with fluoridated water. This student would like to ask whether access to fluoridated water prevents tooth decay. What would be an effective control group to ask this question?
A. individuals who have fluoride added to their toothpaste but not their water B. individuals with access to fluoridated water C. individuals with access to differing amounts of fluoride in the water D. individuals with access to water with no fluoride added