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19 Sep 2024, 21:13
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A new era in medical science has dawned with the realization of the critical role of the “forgotten organ” - the gut microbiota, in health and disease. Microbiota refers to the community of microorganisms, including bacteria, viruses, and fungi, that inhabit a particular environment, such as the human gut. Central to this beneficial interaction between the microbiota and host is the manner in which bacteria and most likely other microorganisms contained within the gut communicate with the host’s immune system and participate in a variety of metabolic processes of mutual benefit to the host and the microbe.
At birth, the entire intestinal tract is sterile; the infant’s gut is first colonized by maternal and environmental bacteria during birth and continues to be populated through feeding and other contacts. By the end of the first year of life, the microbial profile is distinct for each infant; by the age of 2.5 years, the microbiota fully resembles the microbiota of an adult in terms of composition.
Following infancy, the composition of the intestinal microflora remains relatively constant until later life. It has been claimed that the composition of each individual’s flora is so distinctive that it could be used as an alternative to fingerprinting. The microbiota is thought to remain stable until old age when changes are seen, possibly related to alterations in digestive physiology and diet.
In humans, the composition of the microbiota is influenced not only by age but also by diet and socioeconomic conditions. In a recent study of elderly individuals, the interaction of diet and age was demonstrated, firstly, by a close relationship between diet and microbiota composition in the subjects and, secondly, by interactions between diet, the microbiota, and health status.
Antibiotics, whether prescribed or in the food chain as a result of their administration to animals, have the potential to profoundly impact the microbiota. In the past, it was thought that these effects were relatively transient, with complete recovery of the microbiota occurring very soon after the course of antibiotic therapy was complete. However, while recent studies have confirmed that recovery is fairly rapid for many species, some species and strains show more sustained effects.
Which of the following can be inferred about the stability of the microbiota in early adulthood?
A. The microbiota remains in a continuous state of flux during early adulthood due to frequent changes in environmental factors.
B. The microbiota reaches a composition that is largely stable after early childhood, with minimal changes until later life.
C. The microbiota is fully formed by the age of 2.5 years and experiences no further significant alterations, even during later stages of life.
D. The microbiota stabilizes in infancy but begins to gradually decline in diversity during early adulthood.
E. After early adulthood, the composition of the microbiota becomes highly unpredictable and varies significantly between individuals.
At birth, the entire intestinal tract is sterile; the infant’s gut is first colonized by maternal and environmental bacteria during birth and continues to be populated through feeding and other contacts. By the end of the first year of life, the microbial profile is distinct for each infant; by the age of 2.5 years, the microbiota fully resembles the microbiota of an adult in terms of composition.
Following infancy, the composition of the intestinal microflora remains relatively constant until later life. It has been claimed that the composition of each individual’s flora is so distinctive that it could be used as an alternative to fingerprinting. The microbiota is thought to remain stable until old age when changes are seen, possibly related to alterations in digestive physiology and diet.
In humans, the composition of the microbiota is influenced not only by age but also by diet and socioeconomic conditions. In a recent study of elderly individuals, the interaction of diet and age was demonstrated, firstly, by a close relationship between diet and microbiota composition in the subjects and, secondly, by interactions between diet, the microbiota, and health status.
Antibiotics, whether prescribed or in the food chain as a result of their administration to animals, have the potential to profoundly impact the microbiota. In the past, it was thought that these effects were relatively transient, with complete recovery of the microbiota occurring very soon after the course of antibiotic therapy was complete. However, while recent studies have confirmed that recovery is fairly rapid for many species, some species and strains show more sustained effects.
Which of the following can be inferred about the stability of the microbiota in early adulthood?
A. The microbiota remains in a continuous state of flux during early adulthood due to frequent changes in environmental factors.
B. The microbiota reaches a composition that is largely stable after early childhood, with minimal changes until later life.
C. The microbiota is fully formed by the age of 2.5 years and experiences no further significant alterations, even during later stages of life.
D. The microbiota stabilizes in infancy but begins to gradually decline in diversity during early adulthood.
E. After early adulthood, the composition of the microbiota becomes highly unpredictable and varies significantly between individuals.
19 Sep 2024, 21:13
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Official Solution:
A new era in medical science has dawned with the realization of the critical role of the “forgotten organ” - the gut microbiota, in health and disease. Microbiota refers to the community of microorganisms, including bacteria, viruses, and fungi, that inhabit a particular environment, such as the human gut. Central to this beneficial interaction between the microbiota and host is the manner in which bacteria and most likely other microorganisms contained within the gut communicate with the host’s immune system and participate in a variety of metabolic processes of mutual benefit to the host and the microbe.
At birth, the entire intestinal tract is sterile; the infant’s gut is first colonized by maternal and environmental bacteria during birth and continues to be populated through feeding and other contacts. By the end of the first year of life, the microbial profile is distinct for each infant; by the age of 2.5 years, the microbiota fully resembles the microbiota of an adult in terms of composition.
Following infancy, the composition of the intestinal microflora remains relatively constant until later life. It has been claimed that the composition of each individual’s flora is so distinctive that it could be used as an alternative to fingerprinting. The microbiota is thought to remain stable until old age when changes are seen, possibly related to alterations in digestive physiology and diet.
In humans, the composition of the microbiota is influenced not only by age but also by diet and socioeconomic conditions. In a recent study of elderly individuals, the interaction of diet and age was demonstrated, firstly, by a close relationship between diet and microbiota composition in the subjects and, secondly, by interactions between diet, the microbiota, and health status.
Antibiotics, whether prescribed or in the food chain as a result of their administration to animals, have the potential to profoundly impact the microbiota. In the past, it was thought that these effects were relatively transient, with complete recovery of the microbiota occurring very soon after the course of antibiotic therapy was complete. However, while recent studies have confirmed that recovery is fairly rapid for many species, some species and strains show more sustained effects.
Which of the following can be inferred about the stability of the microbiota in early adulthood?
A. The microbiota remains in a continuous state of flux during early adulthood due to frequent changes in environmental factors.
B. The microbiota reaches a composition that is largely stable after early childhood, with minimal changes until later life.
C. The microbiota is fully formed by the age of 2.5 years and experiences no further significant alterations, even during later stages of life.
D. The microbiota stabilizes in infancy but begins to gradually decline in diversity during early adulthood.
E. After early adulthood, the composition of the microbiota becomes highly unpredictable and varies significantly between individuals.
A. Incorrect. This option is tempting because the passage mentions that diet and environmental factors can influence the microbiota. However, it overstates the frequency of change. The passage explicitly states that the microbiota remains relatively stable after early childhood and until later life.
B. Correct Answer. The passage mentions that the microbiota resembles that of an adult by age 2.5 and remains relatively constant until old age, making this the best inference about its stability during early adulthood.
C. Incorrect. This option is incorrect because while the microbiota does stabilize by age 2.5, the passage indicates that changes can still occur in later life, specifically during old age, making this too extreme a conclusion.
D. Incorrect. This option introduces an incorrect idea. The passage mentions that changes in the microbiota are observed in old age, not during early adulthood. There is no mention of a gradual decline in diversity during early adulthood.
E. Incorrect. The passage indicates that the microbiota remains relatively constant after early childhood until old age. This option incorrectly suggests a high degree of unpredictability after early adulthood, which is not supported by the passage.
Answer: B
A new era in medical science has dawned with the realization of the critical role of the “forgotten organ” - the gut microbiota, in health and disease. Microbiota refers to the community of microorganisms, including bacteria, viruses, and fungi, that inhabit a particular environment, such as the human gut. Central to this beneficial interaction between the microbiota and host is the manner in which bacteria and most likely other microorganisms contained within the gut communicate with the host’s immune system and participate in a variety of metabolic processes of mutual benefit to the host and the microbe.
At birth, the entire intestinal tract is sterile; the infant’s gut is first colonized by maternal and environmental bacteria during birth and continues to be populated through feeding and other contacts. By the end of the first year of life, the microbial profile is distinct for each infant; by the age of 2.5 years, the microbiota fully resembles the microbiota of an adult in terms of composition.
Following infancy, the composition of the intestinal microflora remains relatively constant until later life. It has been claimed that the composition of each individual’s flora is so distinctive that it could be used as an alternative to fingerprinting. The microbiota is thought to remain stable until old age when changes are seen, possibly related to alterations in digestive physiology and diet.
In humans, the composition of the microbiota is influenced not only by age but also by diet and socioeconomic conditions. In a recent study of elderly individuals, the interaction of diet and age was demonstrated, firstly, by a close relationship between diet and microbiota composition in the subjects and, secondly, by interactions between diet, the microbiota, and health status.
Antibiotics, whether prescribed or in the food chain as a result of their administration to animals, have the potential to profoundly impact the microbiota. In the past, it was thought that these effects were relatively transient, with complete recovery of the microbiota occurring very soon after the course of antibiotic therapy was complete. However, while recent studies have confirmed that recovery is fairly rapid for many species, some species and strains show more sustained effects.
Which of the following can be inferred about the stability of the microbiota in early adulthood?
A. The microbiota remains in a continuous state of flux during early adulthood due to frequent changes in environmental factors.
B. The microbiota reaches a composition that is largely stable after early childhood, with minimal changes until later life.
C. The microbiota is fully formed by the age of 2.5 years and experiences no further significant alterations, even during later stages of life.
D. The microbiota stabilizes in infancy but begins to gradually decline in diversity during early adulthood.
E. After early adulthood, the composition of the microbiota becomes highly unpredictable and varies significantly between individuals.
A. Incorrect. This option is tempting because the passage mentions that diet and environmental factors can influence the microbiota. However, it overstates the frequency of change. The passage explicitly states that the microbiota remains relatively stable after early childhood and until later life.
B. Correct Answer. The passage mentions that the microbiota resembles that of an adult by age 2.5 and remains relatively constant until old age, making this the best inference about its stability during early adulthood.
C. Incorrect. This option is incorrect because while the microbiota does stabilize by age 2.5, the passage indicates that changes can still occur in later life, specifically during old age, making this too extreme a conclusion.
D. Incorrect. This option introduces an incorrect idea. The passage mentions that changes in the microbiota are observed in old age, not during early adulthood. There is no mention of a gradual decline in diversity during early adulthood.
E. Incorrect. The passage indicates that the microbiota remains relatively constant after early childhood until old age. This option incorrectly suggests a high degree of unpredictability after early adulthood, which is not supported by the passage.
Answer: B
16 Feb 2025, 14:51
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bb
For Option C - Don't you think "no further significant alterations" can be understood as, there might non-significant altercations can happen further in microbiota.
The option B & C sounds similar, while C also meaning that altercations can happen but those will be non-significant. I carried away to this answer by the word significant.
For Option C - Don't you think "no further significant alterations" can be understood as, there might non-significant altercations can happen further in microbiota.
The option B & C sounds similar, while C also meaning that altercations can happen but those will be non-significant. I carried away to this answer by the word significant.
