Explain the major differences between covalent and ionic bonding
What will be an ideal response?
In covalent bonding, atoms share electrons. In ionic bonding, two oppositely charged ions are attracted to each other.
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The stroma of the land-plant chloroplast is evolutionarily derived from __________
A. the thylakoid membrane B. the plasma membrane of cyanobacteria C. the periplasm of cyanobacteria D. the cytoplasm of cyanobacteria E. the plasma membrane of a eukaryotic ancestor
When legumes with nitrogen-fixation nodules are given chemical fertilizers with high nitrogen concentrations, they abandon support of the nodules and end the symbiosis. Why?
A. The mineral nutrients inhibit nitrogenase activity. B. Nitrogen gas is no longer available in the soil. C. The plant can conserve valuable energy sources by terminating the symbiotic relationship. D. The dissolved chemical nutrients are toxic to Rhizobium bacteria. E. Dissolved nitrogen uncurls the root hairs, releasing the nodule. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about nitrogen-fixation nodules? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A SNP that can be either A or T is associated with a human disease. In the Case population, there were 2000 A alleles and 1500 T alleles. In the Control population, there were 2500 A alleles and 3000 T alleles. The allelic odds ratio indicates that the presence of an A confers a ________ times greater risk for the disease than does the T allele.
A) 1.33 B) 1 C) 0.64 D) 1.6
In the section "Investigating Life: The Battle for Position in Cacao Tree Leaves", why were some leaves on cacao plant treated with endophytes and others not?
A. as a control for variation between plants B. to reduce the number of plants that were needed C. to reduce the amount of endophyte spores that were needed D. to keep the Phytophthora from spreading to other plants E. The endophytes were able to spread from one leaf to another.