(Question)
Answer the following question given this paragraph: During crossing-over, segments of DNA are exchanged between non-sister chromatids of homologous chromosomes. Notice how this can result in an allele (A) on one chromosome being moved to the other chromosome. The four chromatids compose the tetrad, with a chiasma at the point of exchange. Q: When does exchange of dna segments happen between non-sister chromatids of homologous chromosomes? Choices: - during meiosis - during mitosis - during diversion - during crossing-over A:
(Answer)
during crossing-over

(Question)
Answer the following question given this paragraph: As we saw in the previous chapter, ions are formed when atoms gain or lose electrons. If an atom loses one or more electrons, the resulting ion has a positive charge (more protons are present than electrons). If the atom gains one or more electrons, the resulting ion has a negative charge (more electrons are present than protons). Positive ions are called cations, and negative ions are called anions. Because opposite charges attract one another, cations and anions are held together by strong electromagnetic forces. An ionic compound consists of a large three-dimensional array of alternating cations and anions. For example, sodium chloride (NaCl) is composed of Na + and Cl - ions arranged into a structure like the one shown in Figure below . Q: When atoms gain or lose electrons, what is formed? Choices: - crystals - molecules - gas - ions A:
(Answer)
ions

(Question)
Answer the following question given this paragraph: Winds on Earth are either global or local. Global winds blow in the same directions all the time. They are created when more solar energy strikes the Equator than the polar regions. More about global wind patterns is described in detail in the concept "Global Wind Belts. ". Q: What type of winds are created when more solar energy strikes the equator than the polar regions? Choices: - arctic winds - equatorial winds - domestic winds - global winds A:
(Answer)
global winds