Ques:Answer the following question given this paragraph: Oxidation-reduction reactions are of central importance in organic chemistry and biochemistry. The burning of fuels that provides the energy to maintain our civilization and the metabolism of foods that furnish the energy that keeps us alive both involve redox reactions. All combustion reactions are also redox reactions. A typical combustion reaction is the burning of methane, the principal component of natural gas (Figure 5.5 "The Burning of Natural Gas"). CH4 + 2O2 CO2 + 2H2O In respiration, the biochemical process by which the oxygen we inhale in air oxidizes foodstuffs to carbon dioxide and water, redox reactions provide energy to living cells. A typical respiratory reaction is the oxidation of glucose (C6H12O6), the simple sugar we encountered in the chapter-opening essay that makes up the diet of yeast: C6H12O6 + 6O2 6CO2 + 6H2O Organic chemists use a variety of redox reactions. For example, potassium dichromate (K2Cr2O7) is a common oxidizing agent that can be used to oxidize alcohols (symbolized. Q: Which common oxidizing agent can be used to oxidize alcohols? Choices: - hydrogen dichromate - potassium chloride - hydrogen chloride - potassium dichromate A:

Ans:potassium dichromate
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Ques:Answer the following question given this paragraph: The structure of a neuron allows it to rapidly transmit nerve impulses to other cells. Q: The structure of a neuron allows it to rapidly transmit nerve impulses to other what? Choices: - muscles - limbs - proteins - cells A:

Ans:cells
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Ques:Answer the following question given this paragraph: Cell transport refers to the movement of substances across the cell membrane. Probably the most important feature of a cell's phospholipid membranes is that they are selectively permeable. A membrane that is selectively permeable , or semipermeable, has control over what molecules or ions can enter or leave the cell, as shown in Figure below . This feature allows a cell to control the transport of materials, as dictated by the cell's function. The permeability of a membrane is dependent on the organization and characteristics of the membrane lipids and proteins. In this way, cell membranes help maintain a state of homeostasis within cells (and tissues, organs, and organ systems) so that an organism can stay alive and healthy. Q: Cell transport refers to the movement of substances across what structure? Choices: - cell wall - chloroplasm - phloem - cell membrane A:

Ans:cell membrane
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Ques:Answer the following question given this paragraph: The atmosphere is a big part of the water cycle. What do you think would happen to Earth's water without it?. Q: What is the upper-most atmosphere known as? Choices: - xerosphere - exosphere - ionosphere - thermosphere A:

Ans:
thermosphere
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