Answer the following question given this paragraph: When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between non-sister chromatids of homologous chromosomes. It results in new combinations of genes on each chromosome. Q: When do homologous chromosomes form pairs? Choices: - mitosis - metathesis - transcripton - meiosis A:
meiosis
Answer the following question given this paragraph: Composite volcanoes usually have craters on the top. Why are the craters sometimes "U" or horseshoe-shaped?. Q: A crater can usually be found on the top of what kind of volcanoes? Choices: - Shield - Dome - Compound - composite A:
composite
Q: Answer the following question given this paragraph: Leucoplasts are plastids that store substances such as starch or make small molecules such as amino acids. Q: Amino acids are made by which kind of plastid? Choices: - neuroplasts - glucoplasts - sporozoans - leucoplasts A:
A: leucoplasts
Question: Answer the following question given this paragraph: Q: Which season is moist, causing the most thunderstorms? Choices: - winter - spring - autumn - summer A:
Answer: summer
*Question*
Answer the following question given this paragraph: One major factor that limits the length of food chains is energy. Energy is lost as heat between each trophic level due to the second law of thermodynamics. Thus, after a limited number of trophic energy transfers, the amount of energy remaining in the food chain may not be great enough to support viable populations at yet a higher trophic level. The loss of energy between trophic levels is illustrated by the pioneering studies of Howard T. Odum in the Silver Springs, Florida, ecosystem in the 1940s (Figure 46.5). The primary producers generated 20,819 kcal/m2/yr (kilocalories per square meter per year), the primary consumers generated 3368 kcal/m2/yr, the secondary consumers generated 383 kcal/m2/yr, and the tertiary consumers only generated 21 kcal/m2/yr. Thus, there is little energy remaining for another level of consumers in this ecosystem. Q: Energy is lost as heat between each trophic level due to the second law of what? Choices: - reactions - particles - chemistry - thermodynamics A:
**Answer**
thermodynamics
Answer the following question given this paragraph: Unsaturated hydrocarbons have at least one double or triple bond between carbon atoms, so the carbon atoms are not bonded to as many hydrogen atoms as possible. In other words, they are unsaturated with hydrogen atoms. Q: When carbon atoms are not bonded to as many hydrogen atoms as possible, what kind of hydrocarbon results? Choices: - unstable - aqueous - saturated - unsaturated A:
unsaturated