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19 Sep 2024, 21:19
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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, if true, would most strengthen the argument that antibiotics have long-lasting effects on microbiota?
A. A study shows that all microbial species recover quickly after a course of antibiotics.
B. Evidence emerges that some species of microbiota never recover after repeated antibiotic exposure.
C. Research reveals that individuals who avoid antibiotics have similar microbiota compositions to those who take them.
D. A new class of antibiotics is discovered that does not affect the microbiota.
E. Dietary changes are shown to mitigate the effects of antibiotics on microbiota.
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, if true, would most strengthen the argument that antibiotics have long-lasting effects on microbiota?
A. A study shows that all microbial species recover quickly after a course of antibiotics.
B. Evidence emerges that some species of microbiota never recover after repeated antibiotic exposure.
C. Research reveals that individuals who avoid antibiotics have similar microbiota compositions to those who take them.
D. A new class of antibiotics is discovered that does not affect the microbiota.
E. Dietary changes are shown to mitigate the effects of antibiotics on microbiota.
19 Sep 2024, 21:19
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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, if true, would most strengthen the argument that antibiotics have long-lasting effects on microbiota?
A. A study shows that all microbial species recover quickly after a course of antibiotics.
B. Evidence emerges that some species of microbiota never recover after repeated antibiotic exposure.
C. Research reveals that individuals who avoid antibiotics have similar microbiota compositions to those who take them.
D. A new class of antibiotics is discovered that does not affect the microbiota.
E. Dietary changes are shown to mitigate the effects of antibiotics on microbiota.
A. Incorrect. This option contradicts the argument by suggesting that the effects of antibiotics are not long-lasting. If all microbial species recover quickly, it would weaken the claim about sustained effects, not strengthen it.
B: Correct Answer. This option supports the argument that antibiotics have long-lasting effects by providing evidence that some species of microbiota never recover. This would solidify the notion that the impact of antibiotics on microbiota is persistent and potentially irreversible for certain species.
C. Incorrect. This option has the opposite effect and weakens the argument. If individuals who avoid antibiotics have microbiota compositions similar to those who take antibiotics, it would suggest that antibiotics don’t have a significant long-term impact, weakening the claim.
D. Incorrect. The discovery of a new class of antibiotics that doesn't affect microbiota doesn't strengthen the argument about long-lasting effects of existing antibiotics. It introduces a different, unrelated development.
E. Incorrect. This option suggests that the negative effects of antibiotics can be mitigated through dietary changes, which implies that the effects are not necessarily long-lasting. This would weaken, rather than strengthen, the argument by suggesting that the impact is reversible.
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, if true, would most strengthen the argument that antibiotics have long-lasting effects on microbiota?
A. A study shows that all microbial species recover quickly after a course of antibiotics.
B. Evidence emerges that some species of microbiota never recover after repeated antibiotic exposure.
C. Research reveals that individuals who avoid antibiotics have similar microbiota compositions to those who take them.
D. A new class of antibiotics is discovered that does not affect the microbiota.
E. Dietary changes are shown to mitigate the effects of antibiotics on microbiota.
A. Incorrect. This option contradicts the argument by suggesting that the effects of antibiotics are not long-lasting. If all microbial species recover quickly, it would weaken the claim about sustained effects, not strengthen it.
B: Correct Answer. This option supports the argument that antibiotics have long-lasting effects by providing evidence that some species of microbiota never recover. This would solidify the notion that the impact of antibiotics on microbiota is persistent and potentially irreversible for certain species.
C. Incorrect. This option has the opposite effect and weakens the argument. If individuals who avoid antibiotics have microbiota compositions similar to those who take antibiotics, it would suggest that antibiotics don’t have a significant long-term impact, weakening the claim.
D. Incorrect. The discovery of a new class of antibiotics that doesn't affect microbiota doesn't strengthen the argument about long-lasting effects of existing antibiotics. It introduces a different, unrelated development.
E. Incorrect. This option suggests that the negative effects of antibiotics can be mitigated through dietary changes, which implies that the effects are not necessarily long-lasting. This would weaken, rather than strengthen, the argument by suggesting that the impact is reversible.
Answer: B
