Read the following passage and mark the letter A, B, C or D on you answer sheet to indicate the correct answer to each of the questions.
The term 'virus is derived from the Latin word for poison. or slime. It was originally applied to the noxious stench emanating from swamps that was thought to cause a variety of diseases in the centuries before microbes were discovered and specifically linked to illness. But it was not until almost the end of the nineteenth century that a true virus was proven to be the cause of a disease.
The nature of viruses made them impossible to detect for many years even after bacteria had been discovered and studied. Not only are viruses too small to be seen with a light microscope, they also cannot be detected through their biological activity, except as it occurs in conjunction with other organisms. In fact, viruses show no traces of biological activity by themselves. Unlike bacteria, they are not living agents in the strictest sense Viruses are very simple pieces of organic material composed only of nucleic acid, either DNA or RNA, enclosed in a coat of protein made up of simple structural units (Some viruses also contain carbohydrates and lipids.) They are parasites, requiring human, animal, or plant cells to live. The virus replicates by attaching to a cell and injecting its nucleic acid.' once inside the cell, the DNA or RNA that contains the virus' genetic information takes over the cell's biological machinery, and the cell begins to manufacture viral proteins rather than its own
All of the following may be components of a virus EXCEPT

A. plant cells

B. carbohydrates

C. a coat of protein

D. RNA

Xem lời giải

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Giải bởi Vietjack

Kiến thức đọc hiểu:

Tất cả những điều sau đây có thể là thành phần của vi-rút NGOẠI TRỪ

tế bào thực vật B. cacbohydrat C. một lớp ngoài của protein D. ARN

Dẫn chứng: Viruses are very simple pieces of organic material composed only of nucleic acid, either DNA or RNA, enclosed in a coat of protein made up of simple structural units (Some viruses also contain carbohydrates and lipids.)

Không giống như vi khuẩn, chúng không phải là tác nhân sống, theo nghĩa chặt chẽ nhất, vi rút là những mảnh vật chất hữu cơ rất đơn giản chỉ bao gồm axit nucleic, DNA hoặc RNA, được bao bọc trong một lớp ngoài protein được tạo thành từ các đơn vị cấu trúc đơn giản. (Một số vi rút cũng chưa carbohydrate và lipid.)

Chọn đáp án A

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CÂU HỎI HOT CÙNG CHỦ ĐỀ

Câu 1

Read the following passage and mark the letter A, B, C or D on you answer sheet to indicate the correct answer to each of the questions.
The term 'virus is derived from the Latin word for poison. or slime. It was originally applied to the noxious stench emanating from swamps that was thought to cause a variety of diseases in the centuries before microbes were discovered and specifically linked to illness. But it was not until almost the end of the nineteenth century that a true virus was proven to be the cause of a disease.
The nature of viruses made them impossible to detect for many years even after bacteria had been discovered and studied. Not only are viruses too small to be seen with a light microscope, they also cannot be detected through their biological activity, except as it occurs in conjunction with other organisms. In fact, viruses show no traces of biological activity by themselves. Unlike bacteria, they are not living agents in the strictest sense Viruses are very simple pieces of organic material composed only of nucleic acid, either DNA or RNA, enclosed in a coat of protein made up of simple structural units (Some viruses also contain carbohydrates and lipids.) They are parasites, requiring human, animal, or plant cells to live. The virus replicates by attaching to a cell and injecting its nucleic acid.' once inside the cell, the DNA or RNA that contains the virus' genetic information takes over the cell's biological machinery, and the cell begins to manufacture viral proteins rather than its own
The author implies that bacteria were investigated earlier than virus cause because ________.

A. bacteria are easier to detect

B. viruses are extremely poisonous

C. viruses are found only in hot climates

D. bacteria are harder to eradicate

Lời giải

Kiến thức đọc hiểu:

Tác giả ngụ ý rằng vi khuẩn đã được điều tra sớm hơn so với nguyên nhân do vi rút gây ra bởi vì _______.

vi khuẩn dễ phát hiện hơn B. vi rút cực độc
virut chỉ có ở khí hậu nóng D. vi khuẩn khó diệt trừ hơn

Dẫn chứng: The nature of viruses made them impossible to detect for many years even after bacteria had been discovered and studied. Not only are viruses too small to be seen with a light microscope, they also cannot be detected through their biological activity, except as it occurs in conjunction with other organisms.

Bản chất của vị rút khiến chúng không thể bị phát hiện trong nhiều năm ngay cả khi vi khuẩn đã được phát hiện và nghiên cứu. Vi rút không chỉ quá nhỏ để có thể nhìn thấy bằng kính hiển vi ánh sáng, chúng cũng không thể được phát hiện thông qua hoạt động sinh học của chúng, ngoại trừ khi nó xảy ra cùng với các sinh vật khác.

Chọn đáp án A

Câu 2