Answer the following question given this paragraph: Core electrons are the electrons that are closer to the nucleus and therefore do not participate in bonding. Q: Because core electrons are closer to the nucleus, they are not involved in what? Choices: - diffusion - splitting - fission - bonding A:
bonding
Answer the following question given this paragraph: Q: What often relies on cooperation between the motor and autonomic nervous systems? Choices: - ketosis - thermoregulation - hypothalamus - homeostasis A:
homeostasis
Q: Answer the following question given this paragraph: The only completely effective way to prevent infection with STIs is to avoid sexual contact and other risky behaviors. Using condoms can lower the risk of becoming infected with STIs during some types of sexual activity. However, condoms are not foolproof. Pathogens may be present on areas of the body not covered by condoms. Condoms can also break or be used incorrectly. Q: What is the only way to completely avoid stis? Choices: - cover your mouth - oral sex - contraceptive use - avoid sexual contact A:
A: avoid sexual contact
Question: Answer the following question given this paragraph: low, the two metals with the highest ionization energies (beryllium and magnesium) do form compounds that exhibit some covalent characters. Like the alkali metals, the heavier alkaline earth metals impart color to a flame. As in the case of the alkali metals, this is part of the emission spectrum of these elements. Calcium and strontium produce shades of red, whereas barium produces a green color. Magnesium is a silver-white metal that is malleable and ductile at high temperatures. Passivation decreases the reactivity of magnesium metal. Upon exposure to air, a tightly adhering layer of magnesium oxycarbonate forms on the surface of the metal and inhibits further reaction. (The carbonate comes from the reaction of carbon dioxide in the atmosphere. ) Magnesium is the lightest of the widely used structural metals, which is why most magnesium production is for lightweight alloys. Magnesium (shown in Figure 18.6), calcium, strontium, and barium react with water and air. At room temperature, barium shows the most vigorous reaction. The products of the reaction with water are hydrogen and the metal hydroxide. The formation of hydrogen gas indicates that the heavier alkaline earth metals are better reducing agents (more easily oxidized) than is hydrogen. As expected, these metals react with both acids and nonmetals to form ionic compounds. Unlike most salts of the alkali metals, many of the common salts of the alkaline earth metals are insoluble in water because of the high lattice energies of these compounds, containing a divalent metal ion. Q: Which is the lightest of the widely used structural metals? Choices: - Metal - calcium - potassium - magnesium A:
Answer: magnesium
*Question*
Answer the following question given this paragraph: DNA's three-dimensional structure is a double helix. The hydrogen bonds between the bases at the center of the helix hold the helix together. Q: What type of bonds between the bases at the center of the dna double helix hold the helix together? Choices: - helium bonds - ionic bonds - electron bonds - hydrogen bonds A:
**Answer**
hydrogen bonds
Q: Answer the following question given this paragraph: Q: Constantly going through some form of growth and repair is a characteristic of all what? Choices: - viruses - bacteria - mass - living things A:
A: living things