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18 Jan 2024, 22:14
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Dr. Helen Purdy Beale, a pioneering virologist, made a groundbreaking discovery about the Tobacco Mosaic Virus (TMV). TMV, known for causing disease in tobacco plants, forms distinctive patterns of mottling and discoloration on the leaves. Dr. Beale's work, initially met with skepticism, has been validated by later research and significantly advanced our understanding of viral structures and plant pathology.
Dr. Beale observed that TMV particles form helical structures, a feature not widely accepted or understood at the time. Her studies revealed that these helical structures are critical for the virus's ability to infect and replicate within plant cells. She postulated that the helical form allows the virus to interact more effectively with the host cell's mechanisms, facilitating the spread of the infection through the plant's vascular system.
Most notably, Dr. Beale suggested that the helical structure of TMV played a role in the specific symptoms exhibited by infected plants. She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration. While many scientists focused on the chemical composition of the virus, Dr. Beale's emphasis on physical structure as a determinant of viral behavior was innovative.
Dr. Beale's work laid the foundation for subsequent research into viral morphology and its impact on plant diseases. Her insights have led to a deeper understanding of how viruses, such as TMV, interact with their hosts. The study of TMV's helical structure has since become a classic example in plant virology, illustrating the link between viral form and function.
Based on the passage, how does Dr. Beale's research contribute to our understanding of symptom manifestation in tobacco plants infected with TMV?
A. It clarifies that only tobacco plants can exhibit specific symptoms caused by TMV, such as mottling and discoloration.
B. It establishes a direct link between the helical structure of TMV and the unique patterns of discoloration observed in infected tobacco plants.
C. It suggests that the symptoms exhibited by tobacco plants are a result of the chemical composition of TMV rather than its physical structure.
D. It indicates that all plants infected with TMV will exhibit similar symptoms to those observed in tobacco plants.
E. It proposes that the interaction of TMV with the plant’s vascular system is solely responsible for the symptoms exhibited by tobacco plants.
Dr. Beale observed that TMV particles form helical structures, a feature not widely accepted or understood at the time. Her studies revealed that these helical structures are critical for the virus's ability to infect and replicate within plant cells. She postulated that the helical form allows the virus to interact more effectively with the host cell's mechanisms, facilitating the spread of the infection through the plant's vascular system.
Most notably, Dr. Beale suggested that the helical structure of TMV played a role in the specific symptoms exhibited by infected plants. She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration. While many scientists focused on the chemical composition of the virus, Dr. Beale's emphasis on physical structure as a determinant of viral behavior was innovative.
Dr. Beale's work laid the foundation for subsequent research into viral morphology and its impact on plant diseases. Her insights have led to a deeper understanding of how viruses, such as TMV, interact with their hosts. The study of TMV's helical structure has since become a classic example in plant virology, illustrating the link between viral form and function.
Based on the passage, how does Dr. Beale's research contribute to our understanding of symptom manifestation in tobacco plants infected with TMV?
A. It clarifies that only tobacco plants can exhibit specific symptoms caused by TMV, such as mottling and discoloration.
B. It establishes a direct link between the helical structure of TMV and the unique patterns of discoloration observed in infected tobacco plants.
C. It suggests that the symptoms exhibited by tobacco plants are a result of the chemical composition of TMV rather than its physical structure.
D. It indicates that all plants infected with TMV will exhibit similar symptoms to those observed in tobacco plants.
E. It proposes that the interaction of TMV with the plant’s vascular system is solely responsible for the symptoms exhibited by tobacco plants.
18 Jan 2024, 22:14
Kudos
Bookmarks
Official Solution:
Dr. Helen Purdy Beale, a pioneering virologist, made a groundbreaking discovery about the Tobacco Mosaic Virus (TMV). TMV, known for causing disease in tobacco plants, forms distinctive patterns of mottling and discoloration on the leaves. Dr. Beale's work, initially met with skepticism, has been validated by later research and significantly advanced our understanding of viral structures and plant pathology.
Dr. Beale observed that TMV particles form helical structures, a feature not widely accepted or understood at the time. Her studies revealed that these helical structures are critical for the virus's ability to infect and replicate within plant cells. She postulated that the helical form allows the virus to interact more effectively with the host cell's mechanisms, facilitating the spread of the infection through the plant's vascular system.
Most notably, Dr. Beale suggested that the helical structure of TMV played a role in the specific symptoms exhibited by infected plants. She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration. While many scientists focused on the chemical composition of the virus, Dr. Beale's emphasis on physical structure as a determinant of viral behavior was innovative.
Dr. Beale's work laid the foundation for subsequent research into viral morphology and its impact on plant diseases. Her insights have led to a deeper understanding of how viruses, such as TMV, interact with their hosts. The study of TMV's helical structure has since become a classic example in plant virology, illustrating the link between viral form and function.
Based on the passage, how does Dr. Beale's research contribute to our understanding of symptom manifestation in tobacco plants infected with TMV?
A. It clarifies that only tobacco plants can exhibit specific symptoms caused by TMV, such as mottling and discoloration.
B. It establishes a direct link between the helical structure of TMV and the unique patterns of discoloration observed in infected tobacco plants.
C. It suggests that the symptoms exhibited by tobacco plants are a result of the chemical composition of TMV rather than its physical structure.
D. It indicates that all plants infected with TMV will exhibit similar symptoms to those observed in tobacco plants.
E. It proposes that the interaction of TMV with the plant’s vascular system is solely responsible for the symptoms exhibited by tobacco plants.
B. It establishes a direct link between the helical structure of TMV and the unique patterns of discoloration observed in infected tobacco plants.
The passage states, "Dr. Beale observed that TMV particles form helical structures, a feature not widely accepted or understood at the time. Her studies revealed that these helical structures are critical for the virus's ability to infect and replicate within plant cells." This indicates Dr. Beale's focus on the physical structure of the virus.
Further, the passage mentions, "Most notably, Dr. Beale suggested that the helical structure of TMV played a role in the specific symptoms exhibited by infected plants. She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration." This part explicitly links the helical structure of TMV to the symptom manifestation in tobacco plants, particularly the patterns of discoloration.
Therefore, option B is correct as it accurately reflects the connection Dr. Beale made between the physical structure of TMV (its helical form) and the specific symptoms (patterns of discoloration) seen in tobacco plants, as described in the passage.
Incorrect Answers:
Answer: B
Dr. Helen Purdy Beale, a pioneering virologist, made a groundbreaking discovery about the Tobacco Mosaic Virus (TMV). TMV, known for causing disease in tobacco plants, forms distinctive patterns of mottling and discoloration on the leaves. Dr. Beale's work, initially met with skepticism, has been validated by later research and significantly advanced our understanding of viral structures and plant pathology.
Dr. Beale observed that TMV particles form helical structures, a feature not widely accepted or understood at the time. Her studies revealed that these helical structures are critical for the virus's ability to infect and replicate within plant cells. She postulated that the helical form allows the virus to interact more effectively with the host cell's mechanisms, facilitating the spread of the infection through the plant's vascular system.
Most notably, Dr. Beale suggested that the helical structure of TMV played a role in the specific symptoms exhibited by infected plants. She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration. While many scientists focused on the chemical composition of the virus, Dr. Beale's emphasis on physical structure as a determinant of viral behavior was innovative.
Dr. Beale's work laid the foundation for subsequent research into viral morphology and its impact on plant diseases. Her insights have led to a deeper understanding of how viruses, such as TMV, interact with their hosts. The study of TMV's helical structure has since become a classic example in plant virology, illustrating the link between viral form and function.
Based on the passage, how does Dr. Beale's research contribute to our understanding of symptom manifestation in tobacco plants infected with TMV?
A. It clarifies that only tobacco plants can exhibit specific symptoms caused by TMV, such as mottling and discoloration.
B. It establishes a direct link between the helical structure of TMV and the unique patterns of discoloration observed in infected tobacco plants.
C. It suggests that the symptoms exhibited by tobacco plants are a result of the chemical composition of TMV rather than its physical structure.
D. It indicates that all plants infected with TMV will exhibit similar symptoms to those observed in tobacco plants.
E. It proposes that the interaction of TMV with the plant’s vascular system is solely responsible for the symptoms exhibited by tobacco plants.
B. It establishes a direct link between the helical structure of TMV and the unique patterns of discoloration observed in infected tobacco plants.
The passage states, "Dr. Beale observed that TMV particles form helical structures, a feature not widely accepted or understood at the time. Her studies revealed that these helical structures are critical for the virus's ability to infect and replicate within plant cells." This indicates Dr. Beale's focus on the physical structure of the virus.
Further, the passage mentions, "Most notably, Dr. Beale suggested that the helical structure of TMV played a role in the specific symptoms exhibited by infected plants. She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration." This part explicitly links the helical structure of TMV to the symptom manifestation in tobacco plants, particularly the patterns of discoloration.
Therefore, option B is correct as it accurately reflects the connection Dr. Beale made between the physical structure of TMV (its helical form) and the specific symptoms (patterns of discoloration) seen in tobacco plants, as described in the passage.
Incorrect Answers:
- A. This is incorrect because the passage does not specify that only tobacco plants can exhibit these symptoms.
- C. This is incorrect because the passage emphasizes the physical structure of the virus in symptom manifestation.
- D. This is incorrect as the passage does not make a general statement about all plants, but specifically discusses tobacco plants.
- E. This is incorrect because, while the passage mentions the vascular system, it does not state this interaction is the sole cause of symptoms.
Answer: B
