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¿Qué le p ide Paula a Jacinta para mandar una carta a sus padres?
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- Beetroot cells contain a family of dark red pigments called betalains. The selectively permeable nature of the beetroot cells keeps the internal environment of the cell separate from the external environment of the cell. Researchers are interested in determining whether the selective permeability of beetroot cells is due to the cell membrane or if it is due to the cell wall.Exposure to cellulase is known to damage the structure of the cell wall. An experiment is set up in which beetroot cells are placed in an aqueous solution with cellulase and in one without cellulase.Which of the following results best refutes the alternative hypothesis that selective permeability is a consequence of the cell wall?
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- A gene that influences coat color in domestic cats is located on the XX chromosome. A female cat that is heterozygous for the gene (XBXOXX) has a calico-colored coat. In a genetics experiment, researchers mate a calico-colored female cat (XBXOXX) with an orange-colored male cat (XOYXY) to produce an F1F1 generation. The researchers record observations for the cats in the F1F1 generation and plan to use the data to perform a chi-square goodness-of-fit test for a model of XX-linked inheritance. The data for the chi-square goodness-of-fit test are presented in Table 1.Table 1. Data for the chi-square goodness-of-fit testPhenotype Genotype Observed Expected Calico-colored female XBXO 15 10Orange-colored female XOXO 6 10Black-colored male XBY 11 10Orange-colored male XOY 8 10The researchers calculate a chi-square value of 4.6 and choose a significance level of p=0.05. Which of the following statements best completes the chi-square goodness-of-fit test?AThe null hypothesis can be rejected because the chi-square value is greater than the critical value.BThe null hypothesis can be rejected because the chi-square value is less than the critical value.CThe null hypothesis cannot be rejected because the chi-square value is greater than the critical value.DThe null hypothesis cannot be rejected because the chi-square value is less than the critical value.