*Question*
Q: The electric and magnetic fields are closely related and propagate as what? Read this paragraph and choose the correct option from the provided answers: There is an associated magnetic field ( B ) which propagates outward as well (see Figure 24.6). The electric and magnetic fields are closely related and propagate as an electromagnetic wave. This is what happens in broadcast antennae such as those in radio and TV stations. Closer examination of the one complete cycle shown in Figure 24.5 reveals the periodic nature of the generator-driven charges oscillating up and down in the antenna and the electric field produced. At time t = 0 , there is the maximum separation of charge, with negative charges at the top and positive charges at the bottom, producing the maximum magnitude of the electric field (or E -field) in the upward direction. One-fourth of a cycle later, there is no charge separation and the field next to the antenna is zero, while the maximum. Choices: - mechanical wave - thermal energy - sound wave - electromagnetic wave A:
**Answer**
electromagnetic wave

*Question*
Q: Catabolic reactions break down large organic molecules into smaller molecules, releasing the energy contained in what? Read this paragraph and choose the correct option from the provided answers: Catabolic Reactions Catabolic reactions break down large organic molecules into smaller molecules, releasing the energy contained in the chemical bonds. These energy releases (conversions) are not 100 percent efficient. The amount of energy released is less than the total amount contained in the molecule. Approximately 40 percent of energy yielded from catabolic reactions is directly transferred to the high-energy molecule adenosine triphosphate (ATP). ATP, the energy currency of cells, can be used immediately to power molecular machines that support cell, tissue, and organ function. This includes building new tissue and repairing damaged tissue. ATP can also be stored to fulfill future energy demands. The remaining 60 percent of the energy released from catabolic reactions is given off as heat, which tissues and body fluids absorb. Structurally, ATP molecules consist of an adenine, a ribose, and three phosphate groups (Figure 24.2). The chemical bond between the second and third phosphate groups, termed a high-energy bond, represents the greatest source of energy in a cell. It is the first bond that catabolic enzymes break when cells require energy to do work. The products of this reaction are a molecule of adenosine diphosphate (ADP) and a lone phosphate group (Pi). ATP, ADP, and Pi are constantly being cycled through reactions that build ATP and store energy, and reactions that break down ATP and release energy. Choices: - molecular bonds - liquid bonds - crystals bonds - chemical bonds A:
**Answer**
chemical bonds

*Question*
Q: What is the limiting factor for bacteria in a dish? Read this paragraph and choose the correct option from the provided answers: The blades of simple leaves are not divided. This provides the maximum surface area for collecting sunlight. Choices: - density - speed - material - space A:
**Answer**
space

*Question*
Q: Worms grow to adult size without going through what stage? Read this paragraph and choose the correct option from the provided answers: In some species, the same individual produces both sperm and eggs. But worms mate to exchange sperm, rather than self-fertilizing their own eggs. Fertilized eggs are deposited in a mucous cocoon. Offspring emerge from the cocoon looking like small adults. They grow to adult size without going through a larval stage. Choices: - egg - development - growth - larval A:
**Answer**
larval