Answer the following question given this paragraph: 19.4 Equipotential Lines We can represent electric potentials (voltages) pictorially, just as we drew pictures to illustrate electric fields. Of course, the two are related. Consider Figure 19.8, which shows an isolated positive point charge and its electric field lines. Electric field lines radiate out from a positive charge and terminate on negative charges. While we use blue arrows to represent the magnitude and direction of the electric field, we use green lines to represent places where the electric potential is constant. These are called equipotential lines in two dimensions, or equipotential surfaces in three dimensions. The term equipotential is also used as a noun, referring to an equipotential line or surface. The potential for a point charge is the same anywhere on an imaginary sphere of radius r surrounding the charge. This is true since the potential for a point charge is given by V = kQ / r and, thus, has the same value at any point that is a given distance r from the charge. An equipotential sphere is a circle in the two-dimensional view of Figure 19.8. Since the electric field lines point radially away from the charge, they are perpendicular to the equipotential lines. Q: Since the electric field lines point radially away from the charge, they are perpendicular to what? Choices: - singularity lines - archetypical lines - magnetic field lines - equipotential lines A:
equipotential lines
(Question)
Answer the following question given this paragraph: Figure 42.13 B cell receptors are embedded in the membranes of B cells and bind a variety of antigens through their variable regions. The signal transduction region transfers the signal into the cell. Q: What are embedded in the membranes of b cells and bind a variety of antigens through their variable regions? Choices: - b.a.p cell receptors - a.m. cell receptors - er cell receptors - b cell receptors A:
(Answer)
b cell receptors
Ques: Answer the following question given this paragraph: Corals form large colonies in shallow tropical water. They are confined to shallow water because they have a symbiotic relationship with algae that live inside of them. The algae need sunlight for photosynthesis, so they must stay relatively close to the surface of the water to get enough light. Corals exist only as polyps. They catch plankton with their tentacles. Q: Coral and the algae living inside of them have what type of relationship, since the algae relies on the coral to stay close to the water's surface? Choices: - peculiar - competitive - parasitic - symbiotic A:
Ans: symbiotic
(Q).
Answer the following question given this paragraph: Food and Drink App: Vitamins and Minerals Vitamins are nutrients that our bodies need in small amounts but cannot synthesize; therefore, they must be obtained from the diet. The word vitamin comes from "vital amine" because it was once thought that all these compounds had an amine group (NH2) in it. This is not actually true, but the name stuck anyway. All vitamins are covalently bonded molecules. Most of them are commonly named with a letter, although all of them also have formal chemical names. Thus vitamin A is also called retinol, vitamin C is called ascorbic acid, and vitamin E is called tocopherol. There is no single vitamin B; there is a group of substances called the B complex vitamins that are all water soluble and participate in cell metabolism. If a diet is lacking in a vitamin, diseases such as scurvy or rickets develop. Luckily, all vitamins are available as supplements, so any dietary deficiency in a vitamin can be easily corrected. A mineral is any chemical element other than carbon, hydrogen, oxygen, or nitrogen that is needed by the body. Minerals that the body needs in quantity include sodium, potassium, magnesium, calcium, phosphorus, sulfur, and chlorine. Essential minerals that the body needs in tiny quantities (so-called trace elements) include manganese, iron, cobalt, nickel, copper, zinc, molybdenum, selenium, and iodine. Minerals are also obtained from the diet. Interestingly,. Q: Essential minerals that the body needs in tiny quantities are called what? Choices: - flux minerals - draw minerals - byproduct minerals - trace minerals A:
(A).
trace minerals
Ques:Answer the following question given this paragraph: Farsightedness, or hyperopia, is the condition in which distant objects are seen clearly, but nearby objects appear blurry. It occurs when the eyeball is shorter than normal (see Figure below ). This causes images to be focused in a spot that would fall behind the retina (if light could pass through the retina). Hyperopia can be corrected with convex lenses. The lenses focus images farther forward in the eye, so they fall on the retina instead of behind it. Q: What is the condition in which distant objects are seen clearly, but nearby objects appear blurry? Choices: - synthesise , or hyperopia - nearsightedness or hyperopia - gleam , or hyperopia - farsightedness, or hyperopia A:

Ans:farsightedness, or hyperopia
Ques:Answer the following question given this paragraph: Blizzards are dangerous storms. The wind may blow the snow into deep drifts. Along with the poor visibility, the snow drifts make driving risky. The wind also makes cold temperatures more dangerous. The greater the wind speed, the higher the windchill. Windchill is what the temperature feels like when the wind is taken into account. It depends on air temperature and wind speed ( Figure below ). Higher windchill will cause a person to suffer frostbite and other harmful effects of cold sooner than if the wind isn't blowing. Q: What weather term describes what the temperature feels like when the wind is taken into account? Choices: - windshield - freezing point - humidity - windchill A:

Ans:
windchill