*Question*
Answer the following question given this paragraph:   The cells of all protists have a nucleus. They also have other membrane-bound organelles. For example, all of them have mitochondria, and some of them have chloroplasts.   Q: The cells of all protists have a what?   Choices:  - argon  - cell walls  - protons  - nucleus  A:
**Answer**
nucleus

*Question*
Answer the following question given this paragraph:   When we run a reaction to produce a gas, we expect it to rise into the air. Many students have done experiments where gases such as hydrogen are formed. The gas can be trapped in a test tube held upside-down over the reaction. Carbon dioxide, on the other hand, sinks when it is released. Carbon dioxide has a density greater that air, so it will not rise like these other gases would.   Q: Carbon dioxide does not rise like other gases because it has a density greater than what?   Choices:  - gravity  - light  - water  - air  A:
**Answer**
air

*Question*
Answer the following question given this paragraph:   Comparing Meiosis and Mitosis Mitosis and meiosis are both forms of division of the nucleus in eukaryotic cells. They share some similarities, but also exhibit distinct differences that lead to very different outcomes (Figure 11.7). Mitosis is a single nuclear division that results in two nuclei that are usually partitioned into two new cells. The nuclei resulting from a mitotic division are genetically identical to the original nucleus. They have the same number of sets of chromosomes, one set in the case of haploid cells and two sets in the case of diploid cells. In most plants and all animal species, it is typically diploid cells that undergo mitosis to form new diploid cells. In contrast, meiosis consists of two nuclear divisions resulting in four nuclei that are usually partitioned into four new cells. The nuclei resulting from meiosis are not genetically identical and they contain one chromosome set only. This is half the number of chromosome sets in the original cell, which is diploid.   Q: Mitosis and meiosis are both forms of division of the nucleus in these?   Choices:  - converts cells  - endogenous cells  - reproduction cells  - eukaryotic cells  A:
**Answer**
eukaryotic cells

*Question*
Answer the following question given this paragraph:   CHAPTER SUMMARY 31.1 Nutritional Requirements of Plants Plants can absorb inorganic nutrients and water through their root system, and carbon dioxide from the environment. The combination of organic compounds, along with water, carbon dioxide, and sunlight, produce the energy that allows plants to grow. Inorganic compounds form the majority of the soil solution. Plants access water though the soil. Water is absorbed by the plant root, transports nutrients throughout the plant, and maintains the structure of the plant. Essential elements are indispensable elements for plant growth. They are divided into macronutrients and micronutrients. The macronutrients plants require are carbon, nitrogen, hydrogen, oxygen, phosphorus, potassium, calcium, magnesium, and sulfur. Important micronutrients include iron, manganese, boron, molybdenum, copper, zinc, chlorine, nickel, cobalt, silicon and sodium.   Q: Plants can absorb inorganic nutrients and water through their root system, and what gas from the environment?   Choices:  - hydrogen dioxide  - nitrogen dioxide  - chemical dioxide  - carbon dioxide  A:
**Answer**

carbon dioxide