Answer:
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Explanation:
1 )The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.
2 )The light-dependent reactions produce oxygen gas and convert ADP and NADP+ into the carriers ATP and NADPH. ATP and NADPH provide the energy needed to build high-energy sugars from low-energy carbon dioxide.
Antibiotic resistance in bacterial populations has followed close upon the heels of the widespread use of antibiotics.
As antibiotic-resistant bacteria thrive and sensitive bacteria die, the proportion of resistant cells in a population increases dramatically. These resistant cells continue to undergo binary fission, resulting in an infection that is difficult to treat.
The ability of bacterial populations to evolve resistance requires genetic variation.
Mutation is one source of genetic variation. The large population sizes and rapid reproduction of bacterial populations means that even with a low mutation rate, a significant number of mutations are seen in bacterial populations. Some of these mutations contribute to antibiotic resistance.
Processes such as conjugation allow for genes to be exchanged among bacteria. Because conjugation can occur between bacterial cells of the same species or of different species, antibiotic resistance sometimes spreads surprisingly easily from one species of bacteria to another.
A single R plasmid may have genes that provide resistance to ten or more different antibiotics. This is especially problematic when bacteria that are serious health threats become resistant to multiple antibiotics. For example, methicillin-resistant Staphylococcus aureus (MRSA) infections are caused by bacteria that have evolved resistance to most of the antibiotics that were once used to treat staph infections. MRSA is becoming increasingly difficult to treat.
Water, carbon, and nitrogen
Answer: In light-dependent reactions, the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form of electron carrier molecules like ATP and NADPH. Light energy is harnessed in Photosystems I and II, both of which are present in the thylakoid membranes of chloroplasts.
Explanation: