Q: What do halogens require electrons to achieve? Read this paragraph and choose the correct option from the provided answers: Chapter 7 The Periodic Table and Periodic Trends In , we presented the contemporary quantum mechanical model of the atom. In using this model to describe the electronic structures of the elements in order of increasing atomic number, we saw that periodic similarities in electron configuration correlate with periodic similarities in properties, which is the basis for the structure of the periodic table. For example, the noble gases have what is often called filled or closed-shell valence electron configurations. These closed shells are actually filled s and psubshells with a total of eight electrons, which are called octets; helium is an exception, with a closed 1s shell that has only two electrons. Because of their filled valence shells, the noble gases are generally unreactive. In contrast, the alkali metals have a single valence electron outside a closed shell and readily lose this electron to elements that require electrons to achieve an octet, such as the halogens. Thus because of their periodic similarities in electron configuration, atoms in the same column of the periodic table tend to form compounds with the same oxidation states and stoichiometries. ended with the observation that, because all the elements in a column have the same valence electron configuration, the periodic table can be used to find the electron configuration of most of the elements at a glance. Choices: - coupling - formation - fusion - octet A:
octet

Q: Insects can have specialized mouthparts, such as a proboscis, to siphon the nectar from what? Read this paragraph and choose the correct option from the provided answers: Insects can have specialized mouthparts, such as a proboscis, to siphon the nectar from a flower. Choices: - stems - shrubs - fruits - flowers A:
flowers

Q: Q: Transport vesicles move what type of molecules from the rough endoplasmic reticulum to the golgi apparatus? Read this paragraph and choose the correct option from the provided answers: Transport vesicles are part of the endomembrane system. They are able to move molecules such as proteins between locations inside the cell. For example, transport vesicles move proteins from the rough endoplasmic reticulum to the Golgi apparatus. Choices: - acids - lipids - hormones - proteins A:
A: proteins

Question: Q: Variation in muscle cells gives further insight into some benefits of what type of respiration? Read this paragraph and choose the correct option from the provided answers: Variation in muscle cells gives further insight into some benefits of anaerobic respiration. In vertebrate muscles, lactic acid fermentation allows muscles to produce ATP quickly during short bursts of strenuous activity. Muscle cells specialized for this type of activity show differences in structure as well as chemistry. Red muscle fibers are "dark" because they have a rich blood supply for a steady supply of oxygen, and a protein, myoglobin, which holds extra oxygen. They also contain more mitochondria, the organelle in which the Krebs cycle and electron transport chain conclude aerobic respiration. This is endurance muscle. White muscle cells are "light" because they lack the rich blood supply, have fewer mitochondria, and store the carbohydrate glycogen rather than oxygen. This is muscle built for sprinting. Choices: - natural - enzymatic - aerobic - anaerobic A:
Answer: anaerobic

*Question*
Q: When light passes from one medium to another, it changes what? Read this paragraph and choose the correct option from the provided answers: When light passes from one medium to another, it changes speed. For example, when light passes from air to glass, it slows down. If light strikes a sheet of glass at a 90 angle, or perpendicular to the glass, it slows down but still passes straight through the glass. However, if light enters the glass at an angle other than 90, the light bends as it slows down. The bending of light as it changes speed in a new medium is called refraction . The Figure below shows how refraction occurs. Notice that the speed of light changes again as it passes from the glass back to the air. In this case, the speed increases, and the ray of light resumes its initial direction. For a more detailed explanation of refraction, watch this video: http://www. youtube. com/watch?v=8RM46yvDOHI . Choices: - color - temperature - density - speed A:
**Answer**
speed

(Q).
Q: What do plants make to store extra glucose? Read this paragraph and choose the correct option from the provided answers: Starches are complex carbohydrates. They are polymers of glucose. Starches contain hundreds of glucose monomers. Plants make starches to store extra glucose. Consumers can get starches by eating plants. Common sources of starches in the human diet are pictured Figure below . Our digestive system breaks down starches to sugar, which our cells use for energy. Like other animals, we store any extra glucose as the complex carbohydrate called glycogen. Glycogen is also a polymer of glucose. Choices: - water - fats - sugars - starches A:
(A).
starches