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07 Jan 2024, 16:05
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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.
Of the features of TMV discussed in the passage, Dr. Beale’s research explicitly focuses on which of the following aspects?
A. The virus’s chemical composition and infectivity.
B. The physical structure and symptom expression.
C. The virus's interaction with the plant's vascular system.
D. The rate of spread of the virus within plant tissues.
E. The methods of controlling the spread of TMV in 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.
Of the features of TMV discussed in the passage, Dr. Beale’s research explicitly focuses on which of the following aspects?
A. The virus’s chemical composition and infectivity.
B. The physical structure and symptom expression.
C. The virus's interaction with the plant's vascular system.
D. The rate of spread of the virus within plant tissues.
E. The methods of controlling the spread of TMV in tobacco plants.
07 Jan 2024, 16:05
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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.
Of the features of TMV discussed in the passage, Dr. Beale’s research explicitly focuses on which of the following aspects?
A. The virus’s chemical composition and infectivity.
B. The physical structure and symptom expression.
C. The virus's interaction with the plant's vascular system.
D. The rate of spread of the virus within plant tissues.
E. The methods of controlling the spread of TMV in tobacco plants.
The passage emphasizes Dr. Beale's study of the helical structure of TMV and how this structure influences the virus's movement within plant tissues and the resulting symptoms in infected plants. This focus on physical structure and symptom expression aligns with option B.
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.
Of the features of TMV discussed in the passage, Dr. Beale’s research explicitly focuses on which of the following aspects?
A. The virus’s chemical composition and infectivity.
B. The physical structure and symptom expression.
C. The virus's interaction with the plant's vascular system.
D. The rate of spread of the virus within plant tissues.
E. The methods of controlling the spread of TMV in tobacco plants.
The passage emphasizes Dr. Beale's study of the helical structure of TMV and how this structure influences the virus's movement within plant tissues and the resulting symptoms in infected plants. This focus on physical structure and symptom expression aligns with option B.
Answer: B
15 Jan 2024, 10:34
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While i chose the right ans i want to undrstand why option c is not the rigt answer and what
"She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration." statement means
"She observed that the virus's form influenced how it moved and spread within the plant tissues, leading to the characteristic patterns of discoloration." statement means
