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AEPA General Science - Reviews


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See why our users from 154 countries love us for their exam prep! Including 185 reviews for the AEPA General Science exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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AEPA General Science - Test Reviews Sample Questions

Which of the following actions best represents the conversion of electrical energy into motion?

Correct Answer:
turning on an electric fan


the question at hand is asking which action most effectively demonstrates the transformation of electrical energy into mechanical motion. to evaluate the options provided—twisting in a light bulb, turning on an electric fan, turning on an electric stove, and switching on a light switch—we need to understand how each device uses electricity.

twisting in a light bulb generally involves converting electrical energy into light (and some heat). this does not involve significant mechanical motion, so this option does not best represent the conversion of electrical energy into motion.

turning on an electric stove also primarily converts electrical energy into heat to cook food or boil water. like the light bulb, this action does not involve converting electricity into mechanical motion, so it is not the best example of the conversion we're focusing on.

switching on a light switch is merely an action that allows electricity to flow to a device; by itself, it does not perform any conversion of electrical energy into motion. the actual conversion depends on what is connected to the switch. typically, like with light bulbs or stoves, the connected device might not involve significant mechanical motion.

turning on an electric fan, however, directly converts electrical energy into mechanical motion. when the fan is activated, electrical energy powers the motor inside the fan, which then rotates the blades. this rotation of the blades is a clear and direct form of mechanical motion, driven entirely by the electrical energy supplied to the fan.

therefore, turning on an electric fan. this choice is the most straightforward and relevant example of converting electrical energy into motion, as it involves the direct use of electricity to power a mechanical process, namely the movement of the fan blades. this action is essential for the fan's function, which is to circulate air, demonstrating the conversion of electrical energy into mechanical energy effectively and visibly.

 Between cells in most animal tissues, gap junctions are formed by which of the following proteins?

Correct Answer:
 connexins


gap junctions are specialized structures that facilitate communication between cells in animal tissues. these junctions allow for the direct transfer of ions and small molecules between cells, enabling rapid and coordinated responses to physiological stimuli. the primary structural components of gap junctions are proteins known as connexins.

connexins are a family of integral membrane proteins that assemble into complexes called connexons or hemichannels. each connexon is formed from six connexin molecules, arranged in a circular configuration. when the plasma membranes of two adjacent cells are in close proximity, the connexons from each cell align and dock with each other, creating a continuous aqueous channel that spans both cell membranes.

this alignment of connexons from adjacent cells forms a gap junction channel, through which ions and small molecules (such as glucose, amino acids, and second messengers like cyclic amp) can pass directly from one cell to another. this intercellular communication is crucial for various physiological processes, including the coordination of heart muscle contraction, regulation of neuronal activity, and overall cellular homeostasis.

connexins are not only structural components but also play a role in the regulation of gap junction communication. the opening and closing of gap junction channels can be influenced by changes in ph, calcium concentration, and membrane voltage, among other factors. moreover, the expression and assembly of different types of connexins can be tissue-specific, providing a tailored communication network that meets the unique needs of different tissues.

it is important to distinguish connexins from other junctional proteins such as plasmodesmata, adherens, and glycoproteins. plasmodesmata are analogous structures found in plant cells, adherens are involved in cell adhesion and signaling in multicellular organisms, and glycoproteins are proteins that have sugar molecules attached to them, playing roles in cell recognition and stability. each of these proteins has distinct functions and structural characteristics that differentiate them from connexins and their role in forming gap junctions.