Multiple Choice
Which of the following characteristics does not need to be standardized in a Kirby-Bauer assay?
3. Acids and Bases
Organic Chemistry Reactions
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In the context of organic chemistry reactions, what is the primary difference between photosynthesis and chemosynthesis?
A
Photosynthesis occurs in the absence of oxygen, while chemosynthesis requires oxygen.
B
Photosynthesis uses light energy, while chemosynthesis uses chemical energy.
C
Photosynthesis produces glucose, while chemosynthesis produces proteins.
D
Photosynthesis is an exothermic reaction, while chemosynthesis is endothermic.
Verified step by step guidance1
Understand the basic definitions: Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy stored in glucose. Chemosynthesis, on the other hand, is the process by which certain organisms synthesize carbohydrates by using energy obtained from the oxidation of inorganic substances, rather than light.
Identify the energy source: Photosynthesis uses light energy, typically from the sun, to drive the synthesis of glucose from carbon dioxide and water. Chemosynthesis relies on chemical energy derived from reactions involving inorganic molecules, such as hydrogen sulfide or methane.
Consider the products formed: In photosynthesis, the primary product is glucose, a simple sugar that serves as an energy source for the plant. Chemosynthesis typically results in the formation of carbohydrates, but the specific products can vary depending on the organisms and the chemicals involved.
Examine the thermodynamics: Photosynthesis is generally considered an endothermic process because it requires the absorption of light energy to drive the reaction. Chemosynthesis can be either exothermic or endothermic, depending on the specific chemical reactions involved.
Clarify the environmental conditions: Photosynthesis typically occurs in environments where light is available, such as on the surface of leaves. Chemosynthesis occurs in environments where light is not available, such as deep-sea hydrothermal vents, where organisms rely on chemical energy sources.
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